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English
Verb
hot-stage (third-person singular simple present hot-stages, present participle hot-staging, simple past and past participle hot-staged)
- (intransitive) To light the engine(s) of a rocket stage while still attached to the stage beneath it.
The Proton's second stage avoids ullage issues by hot-staging, allowing the engines to ignite while still being pushed by the first stage, but this necessitates the use of a special open trusswork in the interstage area to prevent the superheated second-stage exhaust from blowing up the rocket.