In one aspect, a hybrid airship including an outer shell, a plurality of helium filled gas envelopes, and an all-electric propulsion system may have the shape of a delta-wing. In some embodiments, the hybrid airship may be launched using buoyancy lift alone and aerodynamic lift may be provided by the...http://www.google.de/patents/US7093789?utm_source=gb-gplus-sharePatent US7093789 - Delta-winged hybrid airship
