Word: rotor
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...front, is for subsonic speeds and is used to calibrate the instruments used in the testing program. This subsonic section, with a diameter of six inches, narrows down to a throat--shaped section where supersonic speeds are produced. Behind this is a subsonic cascade tunnel, used in the rotor tests...
...centrifugal compressor produced a few years ago. The improvement of jet engine compressors is tremendously important because of the vast amount of work the engine does to drive the compressor compared with the work done in driving the airplane forward. Thus, a one per cent increase in rotor efficiency means a five percent increase in total engine efficiency...
...machine needed repairs after that. This month the Little Spinner was ready for the air once more, and Willy persuaded a Swiss friend to take it on its second flight. At 18 ft. the friend got panicky, gave the Little Spinner too much gas and stripped the rotor gears...
Until recently, jet engines had only one essential moving part: the rotor. The forward end of its shaft spins an air compressor, which usually looks like a series of small windmills on the rear end of the shaft. High-pressure air from the last windmill goes to the combustion chambers where the fuel is burned. Hot gases formed there spin a turbine. The turbine turns the compressor, and the gases that pass through it shoot out the tailpipe in a high-speed jet whose reaction pushes the airplane forward...
...Culver City, Calif., mechanics wheeled out the world's largest known helicopter for its first test flight last week. As the 125-ft.-long rotor blade began to twirl, the monster whirlybird rose aloft and flew around the field at a height of about 40 feet for 8.9 minutes. The XH-17, built for the Air Force by Planemaker Howard Hughes, is designed to lift for short distances loads of several tons (e.g., artillery, bridge sections, tanks and trucks) by straddling them like a lumber carrier. Power is provided by two General Electric turbojet engines astride the fuselage plus...