The invention detects the loft time, speed, power and/or drop distance of a vehicle, such as a sporting vehicle, during activities of moving and jumping. A loft sensor detects when the vehicle leaves the ground and when the vehicle returns to the ground. A controller subsystem converts the sensed information...http://www.google.de/patents/US20020116147?utm_source=gb-gplus-sharePatent US20020116147 - Methods and systems for assessing athletic performance
