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What (who) is cycle air - definition
![The air cycle machine aboard a [[Sukhoi Superjet 100]]](https://commons.wikimedia.org/wiki/Special:FilePath/Air conditioning systems of a Sukhoi Superjet.jpg?width=200 "The air cycle machine aboard a [[Sukhoi Superjet 100]]")
![adiabatic]] compression (''B and colored orange'') stroke. Through the combustion of fuel, heat is added in a constant volume ([[isochoric process]]) process, followed by an adiabatic expansion process power (letter ''C and colored red'') stroke. The cycle is closed by the exhaust (letter ''D and colored blue'') stroke, characterized by isochoric cooling and isobaric compression processes.](https://commons.wikimedia.org/wiki/Special:FilePath/OttoCycleTSDiagram.svg?width=200 "adiabatic]] compression (''B and colored orange'') stroke. Through the combustion of fuel, heat is added in a constant volume ([[isochoric process]]) process, followed by an adiabatic expansion process power (letter ''C and colored red'') stroke. The cycle is closed by the exhaust (letter ''D and colored blue'') stroke, characterized by isochoric cooling and isobaric compression processes.")
Wikipedia
A liquid air cycle engine (LACE) is a type of spacecraft propulsion engine that attempts to increase its efficiency by gathering part of its oxidizer from the atmosphere. A liquid air cycle engine uses liquid hydrogen (LH2) fuel to liquefy the air.
In a liquid oxygen/liquid hydrogen rocket, the liquid oxygen (LOX) 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.
LACE was studied to some extent in the USA during the late 1950s and early 1960s, and by late 1960 Marquardt had a testbed system running. However, as NASA moved to ballistic capsules during Project Mercury, funding for research into winged vehicles slowly disappeared, and LACE work along with it.
LACE was also the basis of the engines on the British Aerospace HOTOL design of the 1980s, but this did not progress beyond studies.
