To demonstrate the merits of swept-back wings, simple sweep theory is presented. It is shown why a swept wing can experience local supersonic flow while still being in subcritical conditions, thereby postponing the onset of strong shock waves and drag divergence. It is also shown how the wave...
(F) Deterioration in airflow in the tip region as AOA increases (see Section 9.6.4, Cause of Spanwise Flow for a Swept Back Wing Planform). Near stall, this induces a strong nose pitch-up moment and an accompanying reduction in roll stability and aileron effectiveness. It also limits ...
1. In a delta-shaped aircraft having a longitudinal axis, a pair of opposing wings for providing aircraft directional stability, wherein each wing comprising: a substantially straight swept-back leading edge; a lower surface extending aft from the leading edge; and a lower airflow channeling...
Due to this inefficiency, heavy aircraft commonly utilize low-wing or high-wing configurations. However, utilizing the concepts described herein, performance and survivability advantages to using a mid-wing, or blended wing, configuration may be realized with a heavy lifting aircraft, such as the ...
The four parameters determining the shock attachment criterion are the gas’s specific heat ratio, the freestream Mach number M, the sweepback angle, and the flow incidence. The compression zone contained by the enclosed shock waves and the bottom portion of the wing surface is the flow field...
wing edges. A pair of spaced slots are disposed on each side of the aircraft center line and spaced well inboard of the wing leading edges. Each pair of spaced slots are positioned along an imaginary swept back ray originating from and extending aft of the wing apex, with the front member...
Slotted cruise airfoil technology allows production of a substantially unswept wing that achieves the same cruise speed as today's conventional jet airplanes with higher sweep. This technology allows the wing boundary layer to negotiate a strong recovery gradient closer to the wing trailing edge. The...
BACKGROUND Ducted fan air-vehicles, such as an Unmanned Aerial Vehicle (UAV) or a vertical-take-off-and-landing (VTOL) vehicle, may have at least one ducted fan and a fan engine to drive the fan blades. Ducted fan air-vehicles are well-known for performance capability in multiple flight...
10. The swept-wing powered-lift aircraft of claim 1, wherein the wing flap comprises a conformal upper surface blown (USB) flap.Description: BACKGROUND When designing an aircraft, wing characteristics are typically dependent upon the type of mission that the aircraft will be primarily performing....