High Quality Content by WIKIPEDIA articles! The US Air Force's aerospaceplane project encompassed a variety of projects from 1958 until 1963 to study a fully-reusable spaceplane. A variety of designs were studied during the lifetime of the project, including most of the early efforts on liquid air cycle engines and even a nuclear-powered ramjet. The effort was started largely due to the work of Weldon Worth at the Wright-Patterson AFB, who published a short work outlining a manned spaceplane. AF officials were interested enough to start SR-89774 for a reusable spaceplane in 1957. By 1959 this work had resulted in the Recoverable Orbital Launch System, or ROLS, based around a LACE engine, known at the time as a Liquid Air Collection System, or LACES. Further work showed that more performance could be gained by extracting only the oxygen from the liquid air, a system they referred to as Air Collection and Enrichment System, or ACES. A contract to develop an ACES testbed was placed with Marquardt and General Dynamics, with Garrett AiResearch building the heat exchanger for cooling the air.

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