US20070164148A1 - Helicopter - Google Patents
Helicopter Download PDFInfo
- Publication number
- US20070164148A1 US20070164148A1 US11/462,177 US46217706A US2007164148A1 US 20070164148 A1 US20070164148 A1 US 20070164148A1 US 46217706 A US46217706 A US 46217706A US 2007164148 A1 US2007164148 A1 US 2007164148A1
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- United States
- Prior art keywords
- rotor
- shaft
- main rotor
- helicopter
- main
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C27/00—Rotorcraft; Rotors peculiar thereto
- B64C27/32—Rotors
- B64C27/37—Rotors having articulated joints
- B64C27/41—Rotors having articulated joints with flapping hinge or universal joint, common to the blades
- B64C27/43—Rotors having articulated joints with flapping hinge or universal joint, common to the blades see-saw type, i.e. two-bladed rotor
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- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63H—TOYS, e.g. TOPS, DOLLS, HOOPS OR BUILDING BLOCKS
- A63H27/00—Toy aircraft; Other flying toys
- A63H27/06—Jet-propelled flying toys, e.g. aeroplanes
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- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63H—TOYS, e.g. TOPS, DOLLS, HOOPS OR BUILDING BLOCKS
- A63H27/00—Toy aircraft; Other flying toys
- A63H27/12—Helicopters ; Flying tops
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C27/00—Rotorcraft; Rotors peculiar thereto
- B64C27/82—Rotorcraft; Rotors peculiar thereto characterised by the provision of an auxiliary rotor or fluid-jet device for counter-balancing lifting rotor torque or changing direction of rotorcraft
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- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63H—TOYS, e.g. TOPS, DOLLS, HOOPS OR BUILDING BLOCKS
- A63H30/00—Remote-control arrangements specially adapted for toys, e.g. for toy vehicles
- A63H30/02—Electrical arrangements
- A63H30/04—Electrical arrangements using wireless transmission
Definitions
- the present disclosure concerns an improved helicopter.
- the disclosure concerns a helicopter generally. In particular, but not exclusively it is related to a toy helicopter, and in particular to a remote-controlled model helicopter or a toy helicopter.
- a helicopter typically includes a body, a main rotor and a tail rotor.
- the main rotor provides an upward force to keep the helicopter in the air, as well as a lateral or forward or backward force to steer the helicopter in required directions. This can be by making the angle of incidence of the propeller blades of the main rotor vary cyclically at every revolution of the main rotor.
- the main rotor has a natural tendency to deviate from its position, which may lead to uncontrolled movements and to a crash of the helicopter if the pilot loses control over the steering of the helicopter.
- the tail rotor is not at all insensitive to this phenomenon, since it has to prevent the body to turn round the drive shaft of the rotor as a result of the resistance torque of the rotor on the body.
- the tail rotor is erected such that it develops a lateral thrust which has to counteract the above-mentioned resistance torque of the rotor, and the helicopter is provided with means which have to enable the pilot to control the lateral thrust so as to determine the flight position round the vertical axis.
- the stability of a helicopter includes the result of the interaction between:
- the system such as a gyroscope or the like to compensate for small undesired variations in the resistance torque of the main rotor;
- helicopter can fly by itself and can thus maintain a certain flight position or maneuver, such as for example hovering or making slow movements, without the intervention of a pilot.
- flying a helicopter usually requires intensive training and much experience of the pilot, for both a full size operational real helicopter as well as a toy helicopter or a remote-controlled model helicopter.
- the present disclosure aims to minimize one or several of the above-mentioned and other disadvantages by providing a simple and cheap solution to auto stabilize the helicopter, such that operating the helicopter becomes simpler and possibly reduces the need for long-standing experience of the pilot.
- the helicopter should meet the following requirements to a greater or lesser degree:
- the disclosure concerns an improved helicopter including a body with a tail; a main rotor with propeller blades which are driven by a rotor shaft and which are hinge-mounted to the rotor shaft by means of a joint.
- the angle between the surface of rotation of the main rotor and the rotor shaft may vary.
- a tail rotor is driven by a second rotor shaft which is directed transversal to the rotor shaft of the main rotor.
- the helicopter is provided with an auxiliary rotor which is driven by the shaft of the main rotor and which is provided with two vanes extending essentially in line with their longitudinal axis.
- the ‘longitudinal’ axis is seen in the sense of rotation of the main rotor, and is essentially parallel to the longitudinal axis of at least one of the propeller blades of the main rotor or is located within a relatively small acute angle with the latter propeller blade axis.
- This auxiliary rotor is provided in a swinging manner on an oscillatory shaft which is provided essentially transversal to the rotor shaft of the main rotor. This is directed essentially transverse to the longitudinal axis of the vanes.
- the main rotor and the auxiliary rotor are connected to each other through a mechanical link, such that the swinging motions of the auxiliary rotor control the angle of incidence of at least one of the propeller blades of the main rotor.
- the helicopter is made more stable by suspending the tail rotor with its rotor shaft in a swing which can rotate round a swing shaft.
- the swing shaft essentially extends in the longitudinal direction relative to the body of the helicopter.
- the tail rotor In case of malfunction or the like, whereby the helicopter starts to turn round the rotor shaft of the main rotor in an unwanted manner, the tail rotor, as a result of the gyroscopic precession acting on the rotating tail rotor as a result of the rotation round the rotor shaft of the main rotor, should tilt round the swing shaft of the tail rotor at a certain angle.
- the thrust of the tail rotor can be adjusted so as to counteract the unwanted effect of the disturbance and to thus automatically restore the stable flight conditions for the helicopter, with minimal or any intervention of the pilot.
- the tail rotor is used essentially as a gyroscope, such that the gyroscope of the known helicopters can be omitted. This can also result in a lot of weight being saved.
- FIG. 1 schematically represents a helicopter according to the disclosure in perspective
- FIG. 2 represents a top view according to arrow F 2 in FIG. 1 ;
- FIGS. 3 and 4 represent respective sections according to lines II-II and III-III in FIG. 2 ;
- FIG. 5 represents a view of the rear rotor part indicated in FIG. 1 by F 5 to a larger scale
- FIG. 6 is a rear view according to arrow F 6 in FIG. 5 ;
- FIG. 7 represents a variant of FIG. 1 ;
- FIG. 8 represents a variant of FIG. 5 ;
- FIG. 9 represents a different view of the tail rotor of FIG. 8 ;
- FIG. 10 represents a section of the helicopter
- FIG. 11 schematically represents an alternative view of the helicopter according to the disclosure in perspective
- FIG. 12 is a perspective view of the main rotor and auxiliary rotor.
- the helicopter 1 represented in the figures by way of example is a remote-controlled helicopter which essentially consists of a body 2 with a landing gear and a tail 3 ; a main rotor 4 ; an auxiliary rotor 5 driven synchronously with the latter and a tail rotor 6 .
- the main rotor 4 is provided by means of what is called a rotor head 7 on a first upward directed rotor shaft 8 which is bearing-mounted in the body 2 of the helicopter 1 in a rotating manner and which is driven by means of a motor 9 and a transmission 10 , whereby the motor 9 is for example an electric motor which is powered by a battery 11 .
- the main rotor 4 in this case has two propeller blades 12 which are in line or practically in line, but which may just as well be composed of a larger number of propeller blades 12 .
- the tilt or angle of incidence A of the propeller blades 12 in other words the angle A which forms the propeller blades 12 as represented in FIG. 6 with the plane of rotation 14 of the main rotor 4 , can be adjusted as, the main rotor 4 is hinge-mounted on this rotor shaft 8 by means of a joint, such that the angle between the plane of rotation of the main rotor and the rotor shaft may freely vary.
- the joint is formed by a spindle 15 of the rotor head 7 .
- the axis 16 of this spindle 15 is directed transversal to the rotor shaft 8 and essentially extends in the direction of the longitudinal axis 13 of one of the propeller blades 12 , and it preferably forms, as represented in FIG. 2 , an acute angle B with this longitudinal axis 13 .
- the tail rotor 6 is driven via a second rotor shaft 17 by means of a second motor 18 and a transmission 19 .
- Motor 16 can be an electric motor.
- the tail rotor 6 with its rotor shaft 17 and its drive 18 - 19 is suspended in a swing 20 which can rotate round a swing shaft 21 which is fixed to the tail 3 of the helicopter 1 by two supports 22 and 23 .
- the swing 20 is provided with an extension piece 24 towards the bottom, which is kept In a central position by means of a spring 25 when in a state of rest, whereby the second rotor shaft 17 in this position is horizontal and directed crosswise to the first rotor shaft 8 .
- a magnet 26 On the lower end of the extension piece 24 of the swing 20 is provided a magnet 26 , whereas opposite the position of the magnet 26 in the above-mentioned state of rest of the swing 20 is fixed a magnetic sensor 27 to the tail 3 which makes it possible to measure the relative angular displacement of the swing 20 and thus of the tail rotor 6 round the swing shaft 21 .
- this angular displacement of the swing 20 can also be measured in other ways, for example by means of a potentiometer.
- the measured signal can be used as an input signal for a control box, which is not represented in the figures, which controls the drives of the main rotor 4 and of the tail rotor 6 and which is provided with a stabilizer algorithm which will give a counter steering command when a sudden unwanted angular displacement of the tail rotor 6 is measured round the swing shaft 21 , resulting from an unwanted rotation of the helicopter 1 round the rotor shaft 8 , so as to restore the position of the helicopter 1 .
- a control box which is not represented in the figures, which controls the drives of the main rotor 4 and of the tail rotor 6 and which is provided with a stabilizer algorithm which will give a counter steering command when a sudden unwanted angular displacement of the tail rotor 6 is measured round the swing shaft 21 , resulting from an unwanted rotation of the helicopter 1 round the rotor shaft 8 , so as to restore the position of the helicopter 1 .
- the helicopter 1 is also provided with an auxiliary rotor 5 which is driven substantially synchronously with the main rotor 4 by the same rotor shaft 8 and the rotor head 7 .
- the main rotor 4 in this case has two vanes 28 which are essentially in line with their longitudinal axis 29 , whereby the longitudinal axis 29 , seen in the sense of rotation R of the main rotor 4 , is essentially parallel to the longitudinal axis 13 of propeller blades 12 of the main rotor 4 or encloses a relatively small acute angle C with the latter, so that both rotors 4 and 5 extend more or less parallel on top of one another with their propeller blades 12 and vanes 28 so to say.
- the diameter of the auxiliary rotor 5 is preferably smaller than the diameter of the main rotor 4 as the vanes 28 have a smaller span than the propeller blades 12 , and the vanes, 28 are substantially rigidly connected to each other.
- This rigid whole forming the auxiliary rotor 5 is provided in a swinging manner on an oscillating shaft 30 which is fixed to the rotor head 7 of the rotor shaft 8 . This is directed transversally the longitudinal axis of the vanes 28 and transversally to the rotor shaft 8 .
- the main rotor 4 and the auxiliary rotor 5 are connected to each other by a mechanical link which is such of the auxiliary rotor 5 the angle of incidence A of at least one of the propeller blades 12 of the main rotor 4 .
- this link is formed of a rod 31 .
- This rod 31 is hinge-mounted to a propeller blade 12 of the main rotor 4 with one fastening point 32 by means of a joint 33 and a lever arm 34 , and with another second fastening point 35 , situated at a distance from the latter, it is hinge-mounted to a vane 28 of the auxiliary rotor 5 by means of a second joint 36 and a second lever arm 37 .
- the fastening point 32 on the main rotor 4 is situated at a distance D from the axis 16 of the spindle 15 of the propeller blades 12 of the main rotor 4
- the other fastening point 35 on the auxiliary rotor 5 is situated at a distance E from the axis 38 of the oscillatory shaft 30 of the auxiliary rotor 5 .
- the distance D is preferably larger than the distance E, and about the double of this distance E, and both fastening points 32 and 35 of the rod 31 are situated, seen in the sense of rotation R, on the same side of the propeller blades 12 of the main rotor 4 or of the varies 28 of the auxiliary rotor 5 , in other words they are both situated in front of or at the back of the propeller blades 12 and vanes 28 , seen in the sense of rotation.
- the longitudinal axis 29 of the vanes 28 of the auxiliary rotor 5 encloses an angle F with the longitudinal axis 13 of the propeller blades 12 of the main rotor 4 , which enclosed angle F is in the order, of magnitude of 10°, whereby the longitudinal axis 29 of the vanes 28 leads the longitudinal axis 13 of the propeller blades 12 , seen in the sense of rotation R.
- the auxiliary rotor 5 is provided with two stabilizing weights 39 which are each fixed to a vane 28 at a distance from the rotor shaft 8 .
- the helicopter 1 is provided with a receiver, so that it can be controlled from a distance by means of a remote control which is not represented.
- the operation of the improved helicopter 1 according to the disclosure is as follows.
- the rotors 4 , 5 and 6 are driven at a certain speed, as a result of which a relative air stream is created in relation to the rotors, as a result of which the main rotor 4 generates an upward force so as to make the helicopter 1 rise or descend or maintain it at a certain height, and the tail rotor 6 develops a laterally directed force which is used to steer the helicopter 1 .
- the surface of rotation of the auxiliary rotor 5 may take
- both rotors 5 and 4 may take up another inclination in relation to the rotor, shaft 8 .
- This difference in inclination may originate in any internal or external force or disturbance whatsoever.
- the auxiliary rotor 5 keeps turning in a plane which is essentially perpendicular to the rotor shaft 8 .
- the main rotor 4 and the auxiliary rotor 5 are placed in relation to each other in such a manner that a swinging motion of the auxiliary rotor 5 is translated almost immediately in the pitch or angle of incidence A of the propeller blades 12 being adjusted.
- This angle can be calculated or determined by experiment for any helicopter 1 or per type of helicopter.
- a first effect is that the auxiliary rotor 5 will first try to preserve its absolute inclination, as a result of which the relative inclination of the surface of rotation of the auxiliary rotor 5 in relation to the rotor shaft 8 changes.
- the rod 31 will adjust the angle of incidence A of the propeller blades 12 , so that the upward force of the propeller blades 12 will increase on one side of the main rotor 4 and will decrease on the diametrically opposed side of this main rotor.
- a second effect is that, since the distance between the far ends of the vanes ′ 28 and the plane of rotation 14 of the main rotor 4 is no longer equal and since also the vanes 28 cause an upward force, a larger pressure is created between the main rotor 4 and the auxiliary rotor 5 on one side of the main rotor 4 than on the diametrically opposed side.
- a third effect plays a role when the helicopter begins to tilt over to the front, to the back or laterally due to a disturbance. Just as in the case of a pendulum, the helicopter will be inclined to go back to its original situation.
- This pendulum effect does not generate any destabilizing gyroscopic forces as with the known helicopters that are equipped with a stabilizer bar directed transversally to the propeller blades of the main rotor. It acts to reinforce the first and the second effect.
- the tail rotor 6 is located in a swinging manner and provides for an additional stabilization and makes it possible for the tail rotor 6 to assume the function of the gyroscope which is often used in existing helicopters, such as model helicopters.
- the body 2 may start to turn round the rotor shaft 8 .
- the tail rotor 6 turns at an angle in one or other sense round the swinging shaft 21 .
- the angular displacement is a function of the amplitude of the disturbance and thus of the rotation of the body 2 round the rotor shaft 8 . This is measured by the sensor 27 .
- the signal of the sensor 27 is used by a control box of a computer to counteract the failure and to adjust the thrust of the tail rotor 6 so as to annul the angular displacement of the tail rotor 6 which is due to the disturbance.
- FIG. 7 represents a helicopter 1 according to the disclosure having a main rotor 4 combined with an auxiliary rotor 5 , but whose tail rotor 6 is of the conventional type, i.e. whose shaft cannot turn in a swing but is bearing-mounted in relation to the tail 3 .
- main rotor 4 and the auxiliary rotor 5 must not necessarily be made as a rigid whole.
- the propeller blades 12 and the vanes 28 can also be provided on the rotor head 7 such that they are mounted and can rotate relatively separately. In that case, for example, two rods 31 may be applied to connect each time one propeller blade 12 to one vane 28 .
- joints and hinge joints may also be realized in other ways than the ones represented, for example by means of torsion-flexible elements.
- a main rotor 4 having more than two propeller blades 12
- the joint of the main rotor 4 is preferably made as a ball joint or as a spindle 15 which is directed essentially transversely to the axis of the oscillatory shaft 30 of the auxiliary rotor 5 and which essentially extends in the longitudinal direction of the one propeller blade 12 concerned which is essentially parallel to the vanes 28 .
- a helicopter according to the disclosure can be made in all sorts of shapes and dimensions while still remaining within the scope of the disclosure. In this sense although the helicopter in some senses has been described as toy or model helicopter, the features described and illustrated can have use in part or whole in a full-scale helicopter.
Abstract
A helicopter has a main rotor with propeller blades which is driven by a rotor shaft and which is hinge-mounted to this rotor shaft. The angle between the surface of rotation of the main rotor and the rotor shaft may vary. A swinging manner on an oscillatory shaft is essentially transverse to the rotor shaft of the main rotor and is directed transversally to the longitudinal axis of the vanes. The main rotor and the auxiliary rotor are connected to each other by a mechanical link. The swinging motions of the auxiliary rotor controls the angle of incidence (A) of at least one of the propeller blades of the main rotor.
Description
- This application claims priority to Belgian Patent Application No. 2006/0043 entitled AUTOSTABIELE HELICOPTER by Alexander VAN DE ROSTYNE, which was filed on Jan. 19, 2006. The contents of that application are incorporated by reference herein.
- The present disclosure concerns an improved helicopter.
- The disclosure concerns a helicopter generally. In particular, but not exclusively it is related to a toy helicopter, and in particular to a remote-controlled model helicopter or a toy helicopter.
- It known that a helicopter is a complex machine which is unstable and as a result difficult to control, so that much experience is required to safely operate such helicopters without mishaps.
- Typically, a helicopter includes a body, a main rotor and a tail rotor.
- The main rotor provides an upward force to keep the helicopter in the air, as well as a lateral or forward or backward force to steer the helicopter in required directions. This can be by making the angle of incidence of the propeller blades of the main rotor vary cyclically at every revolution of the main rotor.
- The main rotor has a natural tendency to deviate from its position, which may lead to uncontrolled movements and to a crash of the helicopter if the pilot loses control over the steering of the helicopter.
- Solutions to slow down the effect have already been provided up to now, including the application of stabilizing rods and weights at the tips of the propeller blades.
- All these solutions make use of the known phenomenon of gyroscopic precession, caused by the Coreolis force and the centrifugal forces, to obtain the desired effect.
- The tail rotor is not at all insensitive to this phenomenon, since it has to prevent the body to turn round the drive shaft of the rotor as a result of the resistance torque of the rotor on the body.
- To this end, the tail rotor is erected such that it develops a lateral thrust which has to counteract the above-mentioned resistance torque of the rotor, and the helicopter is provided with means which have to enable the pilot to control the lateral thrust so as to determine the flight position round the vertical axis.
- Since the tail of the helicopter tends to turn round the drive shaft of the main rotor, even in case of small variations in the drive torque of the main rotor, most helicopters are provided with a separate and autonomous mechanical or electromechanical system such as a gyroscope or the like, which automatically compensates the thrust of the tail rotor for the unwanted rotations.
- In general, the stability of a helicopter includes the result of the interaction between:
- the rotation of the rotor blades; the movements of any possible stabilizing rods; compensation of the resistance torque of the main rotor by means of the tail rotor;
- the system such as a gyroscope or the like to compensate for small undesired variations in the resistance torque of the main rotor; and
- control of the helicopter which controls the rotational speed of the main rotor and of the tail rotor.
- When these elements are essentially in balance the pilot should be able to steer the helicopter as desired.
- This does not mean, however, that the helicopter can fly by itself and can thus maintain a certain flight position or maneuver, such as for example hovering or making slow movements, without the intervention of a pilot.
- Moreover, flying a helicopter usually requires intensive training and much experience of the pilot, for both a full size operational real helicopter as well as a toy helicopter or a remote-controlled model helicopter.
- The present disclosure aims to minimize one or several of the above-mentioned and other disadvantages by providing a simple and cheap solution to auto stabilize the helicopter, such that operating the helicopter becomes simpler and possibly reduces the need for long-standing experience of the pilot.
- The helicopter should meet the following requirements to a greater or lesser degree:
- (a) it can return to a stable hovering position, in case of an unwanted disturbance of the flight conditions. Such disturbance may occur in the form of a gust of wind, turbulences, a mechanical load change of the body or the rotors, a change of position of the body as a result of an adjustment to the cyclic variation of the pitch or angle of incidence of the propeller blades of the main rotor or a steering of the tail rotor or the like with a similar effect; and
- (b) the time required to return to the stable position should be relatively short and the movement of the helicopter should be relatively small.
- To this end, the disclosure concerns an improved helicopter including a body with a tail; a main rotor with propeller blades which are driven by a rotor shaft and which are hinge-mounted to the rotor shaft by means of a joint. The angle between the surface of rotation of the main rotor and the rotor shaft may vary. A tail rotor is driven by a second rotor shaft which is directed transversal to the rotor shaft of the main rotor.
- The helicopter is provided with an auxiliary rotor which is driven by the shaft of the main rotor and which is provided with two vanes extending essentially in line with their longitudinal axis. The ‘longitudinal’ axis, is seen in the sense of rotation of the main rotor, and is essentially parallel to the longitudinal axis of at least one of the propeller blades of the main rotor or is located within a relatively small acute angle with the latter propeller blade axis. This auxiliary rotor is provided in a swinging manner on an oscillatory shaft which is provided essentially transversal to the rotor shaft of the main rotor. This is directed essentially transverse to the longitudinal axis of the vanes. The main rotor and the auxiliary rotor are connected to each other through a mechanical link, such that the swinging motions of the auxiliary rotor control the angle of incidence of at least one of the propeller blades of the main rotor.
- In practice, it appears that such an improved helicopter is more stable and stabilizes itself relatively quickly with or without a restricted intervention of the user.
- According to different aspect of the disclosure, the helicopter is made more stable by suspending the tail rotor with its rotor shaft in a swing which can rotate round a swing shaft. The swing shaft essentially extends in the longitudinal direction relative to the body of the helicopter.
- In case of malfunction or the like, whereby the helicopter starts to turn round the rotor shaft of the main rotor in an unwanted manner, the tail rotor, as a result of the gyroscopic precession acting on the rotating tail rotor as a result of the rotation round the rotor shaft of the main rotor, should tilt round the swing shaft of the tail rotor at a certain angle.
- By measuring the relative angular displacement of the swing and by using the measured signal as an input signal for a microprocessor which controls the drive of the main rotor and the drive of the tail rotor as a function of a stabilizer algorithm, the thrust of the tail rotor can be adjusted so as to counteract the unwanted effect of the disturbance and to thus automatically restore the stable flight conditions for the helicopter, with minimal or any intervention of the pilot.
- In this configuration, the tail rotor is used essentially as a gyroscope, such that the gyroscope of the known helicopters can be omitted. This can also result in a lot of weight being saved.
- In order to further explain the characteristics of the disclosure, the following embodiments of an improved helicopter according to the disclosure are given as an example only, without being limitative in any way, with reference to the accompanying drawings, in which:
-
FIG. 1 schematically represents a helicopter according to the disclosure in perspective; -
FIG. 2 represents a top view according to arrow F2 inFIG. 1 ; -
FIGS. 3 and 4 represent respective sections according to lines II-II and III-III inFIG. 2 ; -
FIG. 5 represents a view of the rear rotor part indicated inFIG. 1 by F5 to a larger scale; -
FIG. 6 is a rear view according to arrow F6 inFIG. 5 ; -
FIG. 7 represents a variant ofFIG. 1 ; -
FIG. 8 represents a variant ofFIG. 5 ; -
FIG. 9 represents a different view of the tail rotor ofFIG. 8 ; -
FIG. 10 represents a section of the helicopter; -
FIG. 11 schematically represents an alternative view of the helicopter according to the disclosure in perspective; -
FIG. 12 is a perspective view of the main rotor and auxiliary rotor. - The helicopter 1 represented in the figures by way of example is a remote-controlled helicopter which essentially consists of a
body 2 with a landing gear and atail 3; amain rotor 4; anauxiliary rotor 5 driven synchronously with the latter and atail rotor 6. - The
main rotor 4 is provided by means of what is called arotor head 7 on a first upward directedrotor shaft 8 which is bearing-mounted in thebody 2 of the helicopter 1 in a rotating manner and which is driven by means of amotor 9 and atransmission 10, whereby themotor 9 is for example an electric motor which is powered by abattery 11. - The
main rotor 4 in this case has twopropeller blades 12 which are in line or practically in line, but which may just as well be composed of a larger number ofpropeller blades 12. - The tilt or angle of incidence A of the
propeller blades 12, in other words the angle A which forms thepropeller blades 12 as represented inFIG. 6 with the plane ofrotation 14 of themain rotor 4, can be adjusted as, themain rotor 4 is hinge-mounted on thisrotor shaft 8 by means of a joint, such that the angle between the plane of rotation of the main rotor and the rotor shaft may freely vary. - In the case of the example of a
main rotor 4 with twopropeller blades 12, the joint is formed by aspindle 15 of therotor head 7. - The
axis 16 of thisspindle 15 is directed transversal to therotor shaft 8 and essentially extends in the direction of thelongitudinal axis 13 of one of thepropeller blades 12, and it preferably forms, as represented inFIG. 2 , an acute angle B with thislongitudinal axis 13. - The
tail rotor 6 is driven via asecond rotor shaft 17 by means of asecond motor 18 and atransmission 19.Motor 16 can be an electric motor. Thetail rotor 6 with itsrotor shaft 17 and its drive 18-19 is suspended in aswing 20 which can rotate round aswing shaft 21 which is fixed to thetail 3 of the helicopter 1 by twosupports - The
swing 20 is provided with anextension piece 24 towards the bottom, which is kept In a central position by means of aspring 25 when in a state of rest, whereby thesecond rotor shaft 17 in this position is horizontal and directed crosswise to thefirst rotor shaft 8. - On the lower end of the
extension piece 24 of theswing 20 is provided amagnet 26, whereas opposite the position of themagnet 26 in the above-mentioned state of rest of theswing 20 is fixed amagnetic sensor 27 to thetail 3 which makes it possible to measure the relative angular displacement of theswing 20 and thus of thetail rotor 6 round theswing shaft 21. - It is clear that this angular displacement of the
swing 20 can also be measured in other ways, for example by means of a potentiometer. - The measured signal can be used as an input signal for a control box, which is not represented in the figures, which controls the drives of the
main rotor 4 and of thetail rotor 6 and which is provided with a stabilizer algorithm which will give a counter steering command when a sudden unwanted angular displacement of thetail rotor 6 is measured round theswing shaft 21, resulting from an unwanted rotation of the helicopter 1 round therotor shaft 8, so as to restore the position of the helicopter 1. - The helicopter 1 is also provided with an
auxiliary rotor 5 which is driven substantially synchronously with themain rotor 4 by thesame rotor shaft 8 and therotor head 7. - The
main rotor 4 in this case has twovanes 28 which are essentially in line with theirlongitudinal axis 29, whereby thelongitudinal axis 29, seen in the sense of rotation R of themain rotor 4, is essentially parallel to thelongitudinal axis 13 ofpropeller blades 12 of themain rotor 4 or encloses a relatively small acute angle C with the latter, so that bothrotors propeller blades 12 andvanes 28 so to say. - The diameter of the
auxiliary rotor 5 is preferably smaller than the diameter of themain rotor 4 as thevanes 28 have a smaller span than thepropeller blades 12, and the vanes, 28 are substantially rigidly connected to each other. This rigid whole forming theauxiliary rotor 5 is provided in a swinging manner on anoscillating shaft 30 which is fixed to therotor head 7 of therotor shaft 8. This is directed transversally the longitudinal axis of thevanes 28 and transversally to therotor shaft 8. - The
main rotor 4 and theauxiliary rotor 5 are connected to each other by a mechanical link which is such of theauxiliary rotor 5 the angle of incidence A of at least one of thepropeller blades 12 of themain rotor 4. In the given example this link is formed of arod 31. - This
rod 31 is hinge-mounted to apropeller blade 12 of themain rotor 4 with onefastening point 32 by means of a joint 33 and alever arm 34, and with anothersecond fastening point 35, situated at a distance from the latter, it is hinge-mounted to avane 28 of theauxiliary rotor 5 by means of a second joint 36 and asecond lever arm 37. - The
fastening point 32 on themain rotor 4 is situated at a distance D from theaxis 16 of thespindle 15 of thepropeller blades 12 of themain rotor 4, whereas theother fastening point 35 on theauxiliary rotor 5 is situated at a distance E from theaxis 38 of theoscillatory shaft 30 of theauxiliary rotor 5. - The distance D is preferably larger than the distance E, and about the double of this distance E, and both fastening points 32 and 35 of the
rod 31 are situated, seen in the sense of rotation R, on the same side of thepropeller blades 12 of themain rotor 4 or of the varies 28 of theauxiliary rotor 5, in other words they are both situated in front of or at the back of thepropeller blades 12 andvanes 28, seen in the sense of rotation. - Also preferably, the
longitudinal axis 29 of thevanes 28 of theauxiliary rotor 5, seen in the sense of rotation R, encloses an angle F with thelongitudinal axis 13 of thepropeller blades 12 of themain rotor 4, which enclosed angle F is in the order, of magnitude of 10°, whereby thelongitudinal axis 29 of thevanes 28 leads thelongitudinal axis 13 of thepropeller blades 12, seen in the sense of rotation R. - The
auxiliary rotor 5 is provided with two stabilizingweights 39 which are each fixed to avane 28 at a distance from therotor shaft 8. - Further, the helicopter 1 is provided with a receiver, so that it can be controlled from a distance by means of a remote control which is not represented.
- As a function of the type of helicopter, it is possible to search for the most appropriate values and relations of the angles B, F and G by experiment; the relation between the distances D and E; the size of the
weights 39 and the relation of the diameters between themain rotor 4 and theauxiliary rotor 5 so as to guarantee a maximum auto stability. - The operation of the improved helicopter 1 according to the disclosure is as follows.
- In flight, the
rotors main rotor 4 generates an upward force so as to make the helicopter 1 rise or descend or maintain it at a certain height, and thetail rotor 6 develops a laterally directed force which is used to steer the helicopter 1. - It is impossible for the
main rotor 4 to adjust itself, and it will turn in theplane 14 in which it has been started, usually the horizontal plane. Under the influence of gyroscopic precession, turbulence and other factors, it will take up an arbitrary undesired position if it is not controlled. - The surface of rotation of the
auxiliary rotor 5 may take - up another inclination in relation to the surface of
rotation 14 of themain rotor 8, whereby bothrotors shaft 8. - This difference in inclination may originate in any internal or external force or disturbance whatsoever.
- In a situation whereby the helicopter 1 is hovering stable, on a spot in the air without any disturbing internal or external forces, the
auxiliary rotor 5 keeps turning in a plane which is essentially perpendicular to therotor shaft 8. - If, however, the
body 2 is pushed out of balance due to any disturbance whatsoever, and therotor shaft 8 turns away from its position of equilibrium, theauxiliary rotor 5 does not immediately follow this movement, since theauxiliary rotor 5 can freely move round theoscillatory shaft 30. - The
main rotor 4 and theauxiliary rotor 5 are placed in relation to each other in such a manner that a swinging motion of theauxiliary rotor 5 is translated almost immediately in the pitch or angle of incidence A of thepropeller blades 12 being adjusted. - For a two-bladed
main rotor 4, this means that thepropeller blades 12 and thevanes 28 of bothrotors main rotor 4 and a smallerauxiliary rotor 5. - This angle can be calculated or determined by experiment for any helicopter 1 or per type of helicopter.
- If the axis of
rotation 8 takes up another inclination than the one which corresponds to the above-mentioned position of equilibrium in a situation whereby the helicopter 1 is hovering, the following happens: - A first effect is that the
auxiliary rotor 5 will first try to preserve its absolute inclination, as a result of which the relative inclination of the surface of rotation of theauxiliary rotor 5 in relation to therotor shaft 8 changes. - As a result, the
rod 31 will adjust the angle of incidence A of thepropeller blades 12, so that the upward force of thepropeller blades 12 will increase on one side of themain rotor 4 and will decrease on the diametrically opposed side of this main rotor. - Since the relative position of the
main rotor 4 and theauxiliary rotor 5 are selected such that a relatively immediate effect is obtained. This change in the upward force makes sure that therotor shaft 8 and thebody 21 are forced back into their original position of equilibrium. - A second effect is that, since the distance between the far ends of the vanes ′28 and the plane of
rotation 14 of themain rotor 4 is no longer equal and since also thevanes 28 cause an upward force, a larger pressure is created between themain rotor 4 and theauxiliary rotor 5 on one side of themain rotor 4 than on the diametrically opposed side. - A third effect plays a role when the helicopter begins to tilt over to the front, to the back or laterally due to a disturbance. Just as in the case of a pendulum, the helicopter will be inclined to go back to its original situation. This pendulum effect does not generate any destabilizing gyroscopic forces as with the known helicopters that are equipped with a stabilizer bar directed transversally to the propeller blades of the main rotor. It acts to reinforce the first and the second effect.
- The effects have different origins but have analogous natures. They reinforce each other so as to automatically correct the position of equilibrium of the helicopter 1 without any intervention of a pilot.
- The
tail rotor 6 is located in a swinging manner and provides for an additional stabilization and makes it possible for thetail rotor 6 to assume the function of the gyroscope which is often used in existing helicopters, such as model helicopters. - In case of a disturbance, the
body 2 may start to turn round therotor shaft 8. As a result, thetail rotor 6 turns at an angle in one or other sense round the swingingshaft 21. This is due to the gyroscopic precession which acts on therotating tail rotor 6 as a result of the rotation of thetail rotor 6 round therotor shaft 8. The angular displacement is a function of the amplitude of the disturbance and thus of the rotation of thebody 2 round therotor shaft 8. This is measured by thesensor 27. - The signal of the
sensor 27 is used by a control box of a computer to counteract the failure and to adjust the thrust of thetail rotor 6 so as to annul the angular displacement of thetail rotor 6 which is due to the disturbance. - This can be done by adjusting the speed of the
tail rotor 6 and/or by adjusting the angles of incidence of the propeller blades of thetail rotor 6, depending on the type of helicopter 1. - If necessary, this aspect of the disclosure may be applied separately, just as the aspect of the
auxiliary rotor 5 can be applied separately, as is illustrated for example by means ofFIG. 7 , which represents a helicopter 1 according to the disclosure having amain rotor 4 combined with anauxiliary rotor 5, but whosetail rotor 6 is of the conventional type, i.e. whose shaft cannot turn in a swing but is bearing-mounted in relation to thetail 3. - In practice, the combination of both aspects makes it possible to produce a helicopter which is very stable in any direction and any flight situation and which is easy to control, even by persons having little or no experience.
- It is clear that the
main rotor 4 and theauxiliary rotor 5 must not necessarily be made as a rigid whole. Thepropeller blades 12 and thevanes 28 can also be provided on therotor head 7 such that they are mounted and can rotate relatively separately. In that case, for example, tworods 31 may be applied to connect each time onepropeller blade 12 to onevane 28. - It is also clear that, if necessary, the joints and hinge joints may also be realized in other ways than the ones represented, for example by means of torsion-flexible elements.
- In the case of a
main rotor 4 having more than twopropeller blades 12, one should preferably be sure that at least onepropeller blade 12 is essentially parallel to one of thevanes 28 of the auxiliary rotor. The joint of themain rotor 4 is preferably made as a ball joint or as aspindle 15 which is directed essentially transversely to the axis of theoscillatory shaft 30 of theauxiliary rotor 5 and which essentially extends in the longitudinal direction of the onepropeller blade 12 concerned which is essentially parallel to thevanes 28. - The present disclosure is not limited to the embodiments described as an example and represented in the accompanying figures. Many different variations in size and scope and features are possible. For instance, instead of electrical motors being provided others forms of motorized power are possible. A different number of blades may be provided to the rotors.
- A helicopter according to the disclosure can be made in all sorts of shapes and dimensions while still remaining within the scope of the disclosure. In this sense although the helicopter in some senses has been described as toy or model helicopter, the features described and illustrated can have use in part or whole in a full-scale helicopter.
Claims (22)
1. A helicopter comprising a body with a tail; a main rotor with propeller blades which is driven by a rotor shaft and which is hinge mounted on this rotor shaft, such that the angle between the plane of rotation of the main rotor and the rotor shaft may vary; a tail rotor which is driven by a second rotor shaft directed transversally to the rotor shaft of the main rotor, an auxiliary rotor driven by the rotor shaft of the main rotor and provided with two vanes extending essentially in a line with their longitudinal axis in the sense of rotation of the main rotor is essentially parallel to the longitudinal axis of at least one of the propeller blades of the main rotor or is at a relatively small acute angle relative to the axis, the auxiliary rotor being mounted in a swinging relationship on an oscillatory shaft which is provided essentially transversally to the rotor shaft of the main rotor and being directed essentially transversally to the longitudinal axis of the vanes, and the main rotor and the auxiliary rotor are connected to each other by a mechanical link, such that the swinging motion of the auxiliary rotor controls the angle of′ incidence of at least one of the propeller blades of the main rotor.
2. A helicopter according to claim 1 , wherein the main rotor includes two propeller blades situated essentially in line with each other.
3. A helicopter according to claim 1 or 2 , wherein the propeller blades of the main rotor, the vanes of the auxiliary rotor respectively, are substantially rigidly connected to each other and the joint of the main rotor is formed of a spindle which is fixed transversally to the rotor shaft of the main rotor and which is directed essentially transversally to the axis of the oscillatory shaft of the auxiliary rotor.
4. A helicopter according to claim 3 , wherein the spindle of the main rotor extends essentially in the longitudinal direction of the propeller blade of the main rotor which is parallel to one of the vanes or is located at an acute angle relative to the longitudinal direction.
5. A helicopter according to claim 1 wherein the mechanical link includes a rod hinge mounted to a vane of the auxiliary rotor with one fastening point and is hinge-mounted with another fastening point to the propeller blade of the main rotor which is parallel to one of the vanes or is at an acute angle relative to the blade.
6. A helicopter according to claim 5 , wherein the fastening point of the rod is situated on the main rotor at a distance from the axis of the spindle of the propeller blades of the main rotor, and the other fastening point of the rod is situated on the auxiliary rotor at a distance from the axis of the oscillatory shaft of the auxiliary rotor.
7. A helicopter according to claim 6 wherein the distance between the fastening point of the rod on the main rotor and the axis of the spindle of the propeller blades of the main rotor is larger than the distance between the fastening point of the rod on the auxiliary rotor and the axis of the oscillatory shaft of the auxiliary rotor.
8. A helicopter according to claim 6 or 7 wherein the distance between the fastening point of the rod on the main rotor and the axis of the spindle of the propeller blades of the main rotor is about the double the distance between the other fastening point on the auxiliary rotor and the axis of the oscillatory shaft of the auxiliary rotor.
9. A helicopter according to claim 5 wherein the rod is fixed to lever arms with its fastening point respectively part of the main rotor and of the auxiliary rotor.
10. A helicopter according to claim 1 wherein the longitudinal axis of the vanes of the auxiliary rotor in the sense of rotation is located within an angle of about 10 degrees with the longitudinal axis of one of the propeller blades of the main rotor
11. A helicopter according to claim 1 wherein the longitudinal axis of one of the propeller blades of the main rotor in the sense of rotation, is located at an acute angle with the axis of the spindle of these propeller blades.
12. A helicopter according to claim 1 wherein the diameter of the auxiliary rotor is smaller than the diameter of the main rotor.
13. A helicopter according to claim 1 wherein the auxiliary rotor is provided with stabilizing weights which are fixed respectively to a vane.
14. A helicopter according to claim 1 wherein the tail rotor is supported by a swing with its rotor shaft which can rotate round a swinging shaft which essentially extends according to the longitudinal direction of the body of the helicopter.
15. A helicopter according to claim 14 wherein a sensor determines the relative angular displacement of the swing round the swinging shaft, and this angular displacement is used as an input signal for a microprocessor which controls the drives of the main rotor and of the tail rotor as a function of a stabilizer algorithm.
16. A helicopter according to claim 15 wherein the sensor includes a magnet fixed to the swing and of a magnetic sensor which is fixed opposite the pendulum path of the magnet on the tail of the helicopter.
17. A helicopter according to any one of claims 14 to 16 wherein between the swing and the tail there is provided a spring which keeps the swing in rest in a central position.
18. A helicopter comprising a body with a tail; a rotor with propeller blades which is driven by a rotor shaft and which is mounted on this rotor shaft, such that the angle between the plane of rotation of the rotor and the rotor shaft may vary; a tail rotor which is driven by a second rotor shaft directed transversally to the rotor shaft of the main rotor, wherein the tail rotor is supported by a swing with its rotor shaft which can rotate round a swinging shaft which essentially extends according to the longitudinal direction of the body of the helicopter.
19. A helicopter according to claim 18 wherein a sensor determines the relative angular displacement of the swing round the swinging shaft, and this angular displacement is used as an input signal for a microprocessor which controls the drives of the main rotor and of the tail rotor as a function of a stabilizer algorithm.
20. A helicopter according to claim 19 wherein the sensor includes a magnet fixed to the swing and of a magnetic sensor which is fixed opposite the pendulum path of the magnet on the tail of the helicopter.
21. A helicopter according to any one of claims 18 to 20 wherein between the swing and the tail there is provided a spring which keeps the swing in rest in a central position.
22. A helicopter comprising a body with a tail; a main rotor with propeller blades which is driven by a rotor shaft and which is mounted on this rotor shaft, such that the angle between the plane of rotation of the main rotor and the rotor shaft may vary; a tail rotor which is driven by a second rotor shaft directed transversally to the rotor shaft of the main rotor, an auxiliary rotor driven by the rotor shaft of the main rotor and provided with two vanes, and the main rotor and the auxiliary rotor being connected to each other by a mechanical link, such that the motion of the auxiliary rotor controls the angle of′ incidence of at least one of the propeller blades of the main rotor.
Priority Applications (47)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/465,781 US7815482B2 (en) | 2006-01-19 | 2006-08-18 | Helicopter |
EP06850428A EP1893314B8 (en) | 2006-01-19 | 2006-12-15 | Helicopter |
DE602006010512T DE602006010512D1 (en) | 2006-01-19 | 2006-12-15 | HELICOPTER |
DE112006002348.9T DE112006002348B4 (en) | 2006-01-19 | 2006-12-15 | helicopter |
DE602006010545T DE602006010545D1 (en) | 2006-01-19 | 2006-12-15 | HELICOPTER |
GB0705116A GB2433214B (en) | 2006-01-19 | 2006-12-15 | Helicopter |
DE112006000079.9T DE112006000079B4 (en) | 2006-01-19 | 2006-12-15 | helicopter |
GB0723265A GB2444390B (en) | 2006-01-19 | 2006-12-15 | Helicopter |
DE112006002349.7T DE112006002349B4 (en) | 2006-01-19 | 2006-12-15 | helicopter |
PCT/US2006/047984 WO2007084234A2 (en) | 2006-01-19 | 2006-12-15 | Helicopter |
GB0723269A GB2446248B (en) | 2006-01-19 | 2006-12-15 | Helicopter |
AT06850428T ATE448844T1 (en) | 2006-01-19 | 2006-12-15 | HELICOPTER |
DE212006000012U DE212006000012U1 (en) | 2006-01-19 | 2006-12-15 | helicopter |
AT06845583T ATE448843T1 (en) | 2006-01-19 | 2006-12-15 | HELICOPTER |
EP06845583A EP1843944B8 (en) | 2006-01-19 | 2006-12-15 | Helicopter |
PCT/US2006/047982 WO2007126426A2 (en) | 2006-01-19 | 2006-12-15 | Helicopter |
CA002569236A CA2569236C (en) | 2006-01-19 | 2006-12-21 | Helicopter |
CA002569609A CA2569609C (en) | 2006-01-19 | 2006-12-21 | Helicopter |
AU2006252280A AU2006252280B1 (en) | 2006-01-19 | 2006-12-28 | Helicopter |
ES200700003U ES1065655Y (en) | 2006-01-19 | 2007-01-02 | HELICOPTER |
ES200700004U ES1065656Y (en) | 2006-01-19 | 2007-01-02 | HELICOPTER |
SG200700006-0A SG134230A1 (en) | 2006-01-19 | 2007-01-03 | Helicopter |
JP2007010523A JP4031022B2 (en) | 2006-01-19 | 2007-01-19 | Helicopter |
US11/627,919 US7662013B2 (en) | 2006-01-19 | 2007-01-26 | Helicopter with horizontal control |
DE102007016701.8A DE102007016701B4 (en) | 2006-08-03 | 2007-04-04 | Helicopter with horizontal control |
US11/736,506 US20070181742A1 (en) | 2006-01-19 | 2007-04-17 | Flying object with tandem rotors |
DE202007016293U DE202007016293U1 (en) | 2006-08-03 | 2007-04-30 | Flying object with tandem rotors |
DE102007020609.9A DE102007020609B4 (en) | 2006-08-03 | 2007-04-30 | Flying object with tandem rotors |
GB0709014A GB2439290B (en) | 2006-08-03 | 2007-05-10 | Helicopter with horizontal control |
GB0722209A GB2442146B (en) | 2006-08-03 | 2007-05-10 | Helicopter with horizontal control |
US11/754,752 US7494397B2 (en) | 2006-01-19 | 2007-06-14 | Helicopter |
US11/842,719 US7467984B2 (en) | 2006-01-19 | 2007-08-21 | Helicopter |
HK07110450A HK1103940A1 (en) | 2006-01-19 | 2007-09-27 | Helicopter |
US11/953,826 US7425167B2 (en) | 2006-01-19 | 2007-12-10 | Toy helicopter |
US11/953,830 US7425168B2 (en) | 2006-01-19 | 2007-12-10 | Toy helicopter |
US11/953,823 US7422505B2 (en) | 2006-01-19 | 2007-12-10 | Toy helicopter |
HK08100494A HK1110048A1 (en) | 2006-08-03 | 2008-01-15 | Helicopter with horizontal control |
HK08105541.5A HK1116454A1 (en) | 2006-08-03 | 2008-05-20 | Helicopter with horizontal control |
HK08107583.0A HK1118259A1 (en) | 2006-01-19 | 2008-07-10 | Helicopter |
US12/188,070 US20080299867A1 (en) | 2006-01-19 | 2008-08-07 | Flying object with tandem rotors |
HK08109425.8A HK1119105A1 (en) | 2006-01-19 | 2008-08-25 | Helicopter |
US12/233,529 US8002604B2 (en) | 2006-01-19 | 2008-09-18 | Remote controlled toy helicopter |
US12/246,449 US20090117812A1 (en) | 2006-01-19 | 2008-10-06 | Flying object with tandem rotors |
US12/264,907 US20090047861A1 (en) | 2006-01-19 | 2008-11-04 | Remote controlled toy helicopter |
US12/264,890 US20090047862A1 (en) | 2006-01-19 | 2008-11-04 | Flying object with tandem rotors |
US12/402,446 US20090163110A1 (en) | 2006-01-19 | 2009-03-11 | Remote controlled toy helicopter |
US12/551,531 US8357023B2 (en) | 2006-01-19 | 2009-08-31 | Helicopter |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BE2006/0043A BE1016960A3 (en) | 2006-01-19 | 2006-01-19 | IMPROVED HELICOPTER. |
BE2006/0043 | 2006-01-19 |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US11/465,781 Continuation-In-Part US7815482B2 (en) | 2006-01-19 | 2006-08-18 | Helicopter |
Related Child Applications (5)
Application Number | Title | Priority Date | Filing Date |
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US11/465,781 Continuation-In-Part US7815482B2 (en) | 2006-01-19 | 2006-08-18 | Helicopter |
US29/275,322 Continuation-In-Part USD546269S1 (en) | 2006-01-19 | 2006-12-20 | Helicopter propeller |
US29/275,324 Continuation-In-Part USD545755S1 (en) | 2006-01-19 | 2006-12-20 | Helicopter |
US29/275,323 Continuation-In-Part USD544825S1 (en) | 2006-01-19 | 2006-12-20 | Helicopter propeller rotor |
US11/736,506 Continuation-In-Part US20070181742A1 (en) | 2006-01-19 | 2007-04-17 | Flying object with tandem rotors |
Publications (1)
Publication Number | Publication Date |
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US20070164148A1 true US20070164148A1 (en) | 2007-07-19 |
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US11/462,177 Abandoned US20070164148A1 (en) | 2006-01-19 | 2006-08-03 | Helicopter |
US12/188,070 Abandoned US20080299867A1 (en) | 2006-01-19 | 2008-08-07 | Flying object with tandem rotors |
US12/264,890 Abandoned US20090047862A1 (en) | 2006-01-19 | 2008-11-04 | Flying object with tandem rotors |
US12/696,183 Active 2031-02-25 US8308522B2 (en) | 2006-01-19 | 2010-01-29 | Flying toy |
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Application Number | Title | Priority Date | Filing Date |
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US12/188,070 Abandoned US20080299867A1 (en) | 2006-01-19 | 2008-08-07 | Flying object with tandem rotors |
US12/264,890 Abandoned US20090047862A1 (en) | 2006-01-19 | 2008-11-04 | Flying object with tandem rotors |
US12/696,183 Active 2031-02-25 US8308522B2 (en) | 2006-01-19 | 2010-01-29 | Flying toy |
Country Status (4)
Country | Link |
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US (4) | US20070164148A1 (en) |
EP (1) | EP2351607B1 (en) |
CN (2) | CN201012292Y (en) |
BE (1) | BE1016960A3 (en) |
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2007
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2008
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2010
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Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
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US7662013B2 (en) | 2006-01-19 | 2010-02-16 | Silverlit Toys Manufactory Ltd. | Helicopter with horizontal control |
US7815482B2 (en) | 2006-01-19 | 2010-10-19 | Silverlit Toys Manufactory, Ltd. | Helicopter |
US8002604B2 (en) | 2006-01-19 | 2011-08-23 | Silverlit Limited | Remote controlled toy helicopter |
US8308522B2 (en) | 2006-01-19 | 2012-11-13 | Silverlit Limited | Flying toy |
US8357023B2 (en) | 2006-01-19 | 2013-01-22 | Silverlit Limited | Helicopter |
EP2351607A3 (en) * | 2006-01-19 | 2014-01-15 | Silverlit Limited | Flying toy |
US20090134269A1 (en) * | 2007-11-26 | 2009-05-28 | Zhihong Luo | Power Assembly and a Coaxial Twin Propeller Model Helicopter Using the Same |
US8096497B2 (en) * | 2007-11-26 | 2012-01-17 | Zhihong Luo | Power assembly and a coaxial twin propeller model helicopter using the same |
US20100003886A1 (en) * | 2008-07-02 | 2010-01-07 | Bob Cheng | Model helicopter |
US8702466B2 (en) | 2008-07-02 | 2014-04-22 | Asian Express Holdings Limited | Model helicopter |
US7883392B2 (en) | 2008-08-04 | 2011-02-08 | Silverlit Toys Manufactory Ltd. | Toy helicopter |
US8052500B2 (en) | 2008-11-25 | 2011-11-08 | Silverlit Limited | Helicopter with main and auxiliary rotors |
Also Published As
Publication number | Publication date |
---|---|
EP2351607A3 (en) | 2014-01-15 |
US20080299867A1 (en) | 2008-12-04 |
US20100124865A1 (en) | 2010-05-20 |
US20090047862A1 (en) | 2009-02-19 |
BE1016960A3 (en) | 2007-11-06 |
EP2351607A2 (en) | 2011-08-03 |
CN201012293Y (en) | 2008-01-30 |
EP2351607B1 (en) | 2015-01-28 |
CN201012292Y (en) | 2008-01-30 |
US8308522B2 (en) | 2012-11-13 |
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Legal Events
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Owner name: SLIVERLIT TOYS MANUFACTORY, LTD, HONG KONG Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:VAN DE ROSTYNE, ALEXANDER JOZEF MAGDALENA;REEL/FRAME:018049/0228 Effective date: 20060801 |
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STCB | Information on status: application discontinuation |
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