Disclosed is a vehicle propulsion system (1000) comprising a propulsion device (201), a turbine (210) mechanically coupled to the propulsion device (201) and configured to drive the propulsion device (201), a fuel cell (110) having an exhaust outlet (111),...

One embodiment of the present invention is a unique aircraft. Another embodiment is a unique aircraft propulsion system. Still another embodiment is a unique system for taxiing an aircraft without starting one or more main aircraft propulsion engines. Othe...

A propulsion system for an aircraft, comprising a gas turbine engine (20) having a high pressure spool (24) and a low pressure spool (26), wherein the low pressure spool (24) is operative to drive a propulsor (28); and an auxiliary power unit (APU) (22) me...