Abstract: An amphibious vehicle capable of high speeds on the water has a buoyant hull with driven tracks on each side of the hull. The tracks are movable between an upper position and a lower position relative to the hull. The tracks propel the vehicle both for land travel and water travel. Water diverter vanes at the aft end of each track divert water being carried forward by the tracks. Water diverter vanes at the forward ends direct water carried on the upper runs in a downward and aft direction. A cavitation plate is located behind each of the tracks while waterborne and below the waterline of the hull. A tiltable transom flap is attached to the transom and extends rearward.

Abstract: An amphibious vehicle capable of high speeds on the water has a buoyant hull with driven tracks on each side of the hull. The tracks are movable between an upper position and a lower position relative to the hull. The tracks propel the vehicle both for land travel and water travel. Water diverter vanes at the aft end of each track divert water being carried forward by the tracks. Water diverter vanes at the forward ends direct water carried on the upper runs in a downward and aft direction. A cavitation plate is located behind each of the tracks while waterborne and below the waterline of the hull. A tiltable transom flap is attached to the transom and extends rearward.

Abstract: A vehicle will serve as a road vehicle, as well as can be flown. The vehicle has a fuselage and a wing with a fixed span. The aspect ratio is low, allowing the vehicle to be operated on a normal roadway. An upper winglet extends upward from each side edge of the wing. A lower winglet extends downward from each side edge. Wheels mount to the lower edges of the lower winglets.

Abstract: A vehicle will serve as a road vehicle, as well as can be flown. The vehicle has a fuselage and a wing with a fixed span. The aspect ratio is low, allowing the vehicle to be operated on a normal roadway. An upper winglet extends upward from each side edge of the wing. A lower winglet extends downward from each side edge. Wheels mount to the lower edges of the lower winglets.

Abstract: A tail sitter airplane will take off and land on its tail section, with its fuselage and nose pointed up. The airplane has a single driven propeller mounted to the nose section. Wings extend outward from the fuselage. Four airfoils locate in the tail section, two horizontal and two vertical. Each has a control surface. Four additional airfoils locate in a forward section, behind the propeller and in front of the wings. Two of the airfoils in the forward section are horizontal and two vertical. Movable control surfaces on these airfoils control the flight during takeoff and landing. The airfoils have chord lengths selected to remove the twist from the slip-stream from the propeller, thereby balancing the torque from the propeller.

Abstract: A tail sitter aircraft of a type that takes off and lands on its tail section with the fuselage pointed vertically upward has landing gears located on its rearward end. Each of the landing gears is mounted on a support axis which is offset from the fuselage axis and which intersects a wheel axle at a 90 degree angle. The landing gears are located on the tail section and spaced around the fuselage axis. Two of the landing gears which are opposite each other will be locked so that they can roll only along a single straight line. The other two landing gears, which are also spaced opposite each other, are locked so that they can roll only on a single straight line. The straight lines are perpendicular to each other.