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{{for|jet engines that cool but do not liquify the air|Precooled jet engine}}
A '''Liquid Air Cycle Engine (LACE)''' is a type of [[spacecraft propulsion]] engine that attempts to gain efficiency by gathering part of its oxidizer from the [[Earth's atmosphere|atmosphere]]. In a [[LOX]]/[[LH2]] [[bipropellant rocket]] the [[liquid oxygen]] needed for combustion is the majority of the weight of the spacecraft on lift-off, so if some of this can be collected from the air on the way, it might dramatically lower the take-off weight of the spacecraft.
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