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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.
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]
During wind tunnel testing at Imperial College, Frank Dernie recorded that the FW08 had a lift to drag ratio of a remarkable 8:1 - eight parts downforce to just one part drag, giving the FW08 supreme aerodynamic efficiency and giving Keke Rosberg a chance to compete with the far more powerful turbo Renault and Ferrari during the 1982 season ...
Aero Warriors, also called aero-cars, is a nickname for four muscle cars developed specifically to race on the NASCAR circuit by Dodge, Plymouth, Ford and Mercury for the 1969 and 1970 racing seasons. [1] The cars were based on production stock cars but had additional aerodynamic features. The first Aero Warrior was the 1969 Ford Torino Talladega.
By proper shaping of the car's underside, the air speed there could be increased, lowering the pressure and pulling the car down onto the track. His test vehicles had a Venturi-like channel beneath the cars sealed by flexible side skirts that separated the channel from above-car aerodynamics. He investigated how flow separation on the ...
Spoilers are added to cars primarily for styling and either have little aerodynamic benefit or worsen the aerodynamics. The term "spoiler" is often mistakenly used interchangeably with "wing". An automotive wing is a device designed to generate downforce as air passes around it, not simply disrupt existing airflow patterns.
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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 ...