Aerodynamics: Blown Flaps For Slow Landings

Constantly increasing air travel has brought commercial airlines constantly increasing headaches. And control of the swift traffic aloft is only a part of the problem. With their high speeds and long landing runs, the big jetliners demand long runways on which to set down, but few cities have that kind of space near by. Convenient, close-in air ports, which are usually small, have become the domain of smaller planes and feeder airlines.

Now pilots of the National Aeronautics and Space Administration are learning how to land the big jets closer to town. At...

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