This creates a jet of hot air which passes over an airfoil-shaped ramp channelling its direction.

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Electricity is generated on the ground by converting the traction on the airfoil lines into electrical power.

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The final version of this vehicle, comprised of a large wing, pilot nacelle and double-skinned airfoil, was flown by cyclist and hang-glider Bryan Allen.

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About 170 posts may go at the Airfoil Technologies International factory in Codnor, Ripley and around 100 positions are threatened at Celanese chemicals in Spondon.

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Over the past five years the Russians developed a prototype of a vertical axis wind turbine with an innovative airfoil that enables the turbine to self-start.

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Thanks to money from the Defense Advanced Research Project Administration (DARPA), Chiang began developing this surface morphing technique to improve the aerodynamics of helicopter blades by altering the airfoil shape.

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