Brennschluss (a loanword, from the German Brennschluß) is either the cessation of fuel burning in a rocket or the time that the burning ceases: the cessation may result from the consumption of the propellants, from deliberate shutoff, or from some other cause.
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In the 1950s, former German rocket engineer Willy Ley, who had emigrated before the Anschluss and hence never worked on the V-2 rocket, tried to get this term used by the English-speaking aerospace industry.