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For conventional fixed-wing aircraft with moderate aspect ratio and sweep, Oswald efficiency number with wing flaps retracted is typically between 0.7 and 0.85. At supersonic speeds, Oswald efficiency number decreases substantially. For example, at Mach 1.2 Oswald efficiency number is likely to be between 0.3 and 0.5. [1]
In aerodynamics, the lift-to-drag ratio (or L/D ratio) is the lift generated by an aerodynamic body such as an aerofoil or aircraft, divided by the aerodynamic drag caused by moving through air. It describes the aerodynamic efficiency under given flight conditions. The L/D ratio for any given body will vary according to these flight conditions.
The design of the new GT began with its aerodynamics package, which was closely related to the ultimate focus of the design team of creating a successful Le Mans race car. [23] Low drag and aerodynamic efficiency were of primary importance in the development of the exterior of the car, and this drove designers to pursue a 'teardrop profile' as ...
Thus, a long, narrow wing has a high aspect ratio, whereas a short, wide wing has a low aspect ratio. [ 1 ] Aspect ratio and other features of the planform are often used to predict the aerodynamic efficiency of a wing because the lift-to-drag ratio increases with aspect ratio, improving the fuel economy in powered airplanes and the gliding ...
The Preliminary Research Aerodynamic Design to Lower Drag, or Prandtl-D was a series of unmanned experimental glider-aircraft developed by NASA under aerodynamicist Albion Bowers. [1] The acronym is a reference to early German Aerospace Engineer Ludwig Prandtl , whose theory of the bell-shaped lift distribution deeply influenced Bowers.
The wing section is an 18% thickness ratio, much thicker than the typical 12-15% thickness of normal light aircraft wings. At least one commercial model airplane kit of the Facetmobile is in production. [3] The prototype FMX-4 Facetmobile crashed on October 13, 1994, after an in-flight engine failure.
In aeronautics, Distributed propulsion is an arrangement in which the propulsive and related air flows are distributed over the aerodynamic surfaces of an aircraft. The purpose is to improve the craft's aerodynamic, propulsive and/or structural efficiency over an equivalent conventional design.
The aerodynamic efficiency of a wing is described by its lift/drag ratio, with a wing giving high lift for little drag being the most efficient. A higher aspect ratio gives a higher lift/drag ratio and so is more efficient.