rocket sled

rocket sled
: a rocket-propelled sled on a rail

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a sled propelled along a long track by rocket engines, for testing the effects of high rates of acceleration and deceleration.

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rocket sled,
a sled with a rocket engine that operates on a rail and can be quickly accelerated to very high speeds, used especially in testing human tolerance, seat ejection, and parachute opening under simulated flight conditions.

Useful english dictionary. 2012.

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