Abstract: A commonly assumed operational requirement for a multi-rotor vehicle, often referred to as a “Quad-Copter” or “Quad-Rotor”, is to have onboard a minimum of three motors, in order to provide a stable hover, and more frequently as many as eight motors. The Twin Propeller Attitude Control (TPAC) Air Vehicle, using a hybrid control system, needs only two motors, in order to achieve full control of altitude, pitch, roll and yaw. Pitch control is achieved by means of differential thrust, while roll and yaw control is accomplished via thrust vectoring. In the event of loss power of one or both engines, a parachute will be automatically released.

Abstract: A roadable vehicle with a single nacelle assembly that contains a pair of inline counter-rotating propellers. Two inline counter-rotating engines are directly connected to the propellers. One engine is shut down in horizontal flight to improve efficiency. Gimbal mounting the nacelle assembly permits thrust to be directed forward to back and left to right to control the vehicle position in the horizontal plane, when hovering. Varying the relative engine speeds controls yaw. The roadable vehicle is adaptable as an unmanned vehicle. The foldable wings equipped with automotive type wheels provide for travel off-road as well as on the highway.

Abstract: A Foldable Rise and Stare Vehicle with a single engine assembly that contains a pair of inline counter-rotating propellers. Two inline counter-rotating engines are directly connected to the propellers. Gimbal mounting the engine assembly permits thrust to be directed forward to back and left to right to control the vehicle position in the horizontal plane, when hovering. Varying the relative engine speeds controls yaw. The Foldable Rise and Stare Vehicle is adaptable as an unmanned vehicle. The vehicle collapses into a flat assembly similar to a foldable beach chair, allowing for convenient transportation.

Abstract: A vehicle equipped with two or more propulsion units, each, for example, consisting of engine with propeller, with their thrust principally directed vertically along a z-axis, such vehicle characterized by that each propulsion unit can be controlled by rotation around two axes mainly perpendicular to the z-axis and that the propulsion units are positioned some distance apart in the z-direction enabling such control of the attitude of the propulsion units to obtain: a) lateral force without attendant moment around the center-of-gravity of the vehicle to control the lateral position of the vehicle, or b) a moment around the center-of-gravity of the vehicle without attendant lateral force to control the lateral attitude of the vehicle, or c) combination of (a) and (b) thereby to simplify the implementation of a system to control the position and attitude of the vehicle whether such control system is manipulated manually, automatically or in a combination thereof.

Abstract: A vertical/short take-off and landing aircraft with a single proprotor assembly that has a pair of inline counter-rotating rotors. Two inline counter-rotating engines are directly connected to the rotors. One engine is shut down in horizontal flight to improve efficiency. Gimbal mounting the proprotor assembly permits thrust to be directed forward to back and left to right to control pitch and roll when hovering. Varying the relative engine speeds controls yaw. The aircraft is adaptable as an unmanned vehicle.