| 摘要 |
This patent concerns a internal duct VTOL propulsion system. To establish balance in a hover lift is generated forward and aft in the aircraft center of gravity. Aft lift is developed by vectoring the aft flow of exhaust in the exhaust duct downward. Forward lift is developed by vectoring a forward air flow of air in the air intake duct downward. Using the air intake duct allows forward lift to be generated well forward of the aircraft's center of gravity. This reduces the forward thrust required to establish balance while in a hover. During VTOL air is drawn through the top of the aircraft. During forward flight air enter the air intake ducts. Internal ducts conduct air, moved aft by the fan, around the fan and forward into the air intake ducts during VTOL. The internal ducts are closed during forward flight.
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