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Propellers have limits to how fast they can push - or pull - an airplane through the air. The limits are caused by the dynamics of airflow over the propeller blade itself, which is basically just a small wing. The jet engine allowed airplanes to fly much faster, faster than the speed of sound. Special types of jet engines, like those used on the SR-71 allow the airplane to fly faster than three times the speed of sound. Newer types of engines, called "scramjets", can push an airplane up to 6, 7 and even 8 times the speed of sound.

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15y ago

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