Last Updated
：2025/11/23
hard start
（ plural ）
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(astronautics) An explosion in a rocket engine during startup, usually due to the presence of too much propellant prior to ignition.
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hard start
The launch was scrubbed after engineers detected a hard start in the main engine during the final countdown.
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The launch was scrubbed after engineers detected a hard start in the main engine during the final countdown.
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