Download The Complete Book of Jets and Rockets by D. N Ahnstrom PDF

By D. N Ahnstrom

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Like the ramjet, the pulsejet depends on a high-speed stream of air being rammed into it. This builds up pressure against the one-way valve, causing it to open and let air ram into the combustion chamber where it mixes with fuel and burns. When this air-and-fuel mixture is ignited, the burning causes a rapid expansion of the gases and builds up pressure inside the tube that closes the one-way valve, and the expanding gases jet out the rear, the only direction they can go. This gives the thrust that drives the missile.

This was just half the time it takes a ton, D. an equal distance. Piloted by A. M. ''"lex Johnston, Boeing's chief of flight test, the big 707 cruised at an altitude between piston-engine transport to fly ->: 33,000 and 35,000 feet and, on several occasions during the flight, at a speed of 620 miles an hour. This was not the 707's top speed, inasmuch as the flight purposely was planned to simulate a typical airline trip at normal cruise power. Soon after this flight and following the announcement of the jet DC-8 airliner by Douglas Aircraft, as vvell as a turboprop transport by Lockheed, the major airlines of the world began placing orders for the new transports.

Because the axial-flow compressor compresses the air without changing its original direction of flow, this engine is smaller in diameter than the centrifugal-flow type, and so takes at a accelerates up less space in the front of the airplane. This means the nose and fuselage of the airplane can be more streamlined. *The power of a gas turbine is equal to the amount of air it can handle, and so the axial-flow turbine is the more powerful of the two. It offers more pounds of thrust, which is like saying it has more horsepower.

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