Abstract: The invention is a supersonic aircraft. In detail, the aircraft is in the form of a flying wing having a generally flat upper surface, a generally cosine shaped lower surface and a swept back leading edge. A propulsion system is mounted in the aircraft for providing forward thrust and is adapted to provide a source of pressurized air. A plenum is mounted under and behind the leading edge of the flying wing in a spaced relationship thereto, the plenum having a swept back leading edge and a length substantially equal to the length of the flying wing and a trailing edge in the form of an exhaust nozzle; the exhaust nozzle extending substantially over the entire length of the plenum. A duct system is coupled between the at least one engine and the plenum such that pressurized air from the engine can be provided to the plenum for ejection out the nozzle in the form of a sheet of pressurized air under the wing.
Abstract: A rotary-wing blade of a rotary-wing aircraft has an airfoil section which has an asymmetrical region of positive camber from its leading edge to its approximately 30-percent chord length point and an essentially symmetrical airfoil region from its 30-percent chord point to approximately its 90-percent chord length point. The region aft of the 90-percent chord point can be optionally curved or reflexed upward or downward to a limited degree. This blade has a large lift coefficient and a small pitching moment and is readily adaptable to meet various design conditions of lift coefficient and pitching moment.