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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]
Automotive aerodynamics differs from aircraft aerodynamics in several ways: The characteristic shape of a road vehicle is much less streamlined compared to an aircraft. The vehicle operates very close to the ground, rather than in free air. The operating speeds are lower (and aerodynamic drag varies as the square of speed).
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 ...
Like most of the hosts on this list, Dreyer participates in a number of projects outside of Today, including Earth Odyssey with Dylan Dreyer—a Saturday morning show on NBC—and Off the Rails, a ...
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.
Several Today show hosts have come and gone from the NBC morning show over the years — both on good and bad terms. Hoda Kotb, for her part, surprised fans in September 2024 with news that she ...
The hosts of the Today show have shared several glimpses into their family lives on the show and online over the years. Savannah Guthrie, Hoda Kotb, Al Roker and more of the NBC morning show stars ...