几年来，各种导弹和其他航天飞行器应用对自给自足、重量轻的电气和液压动力系统的需求不断增加。本航空航天信息报告旨在讨论一个特定类别，即低温燃料动力系统。在本报告中，“低温燃料动力系统”包括所有使用低温燃料和氧化剂的开放循环、化学燃料动力发动机动力系统。对于目前几乎所有的实际系统，这一类别仅限于低温氢或氢氧燃料循环，未来可能会有更先进的系统以氟取代氧。不包括静态低温系统（如燃料电池）和化学动力系统，这些系统使用可储存地球的推进剂。

For several years there has been increasing demand for self-contained, light-weight electrical and hydraulic power systems for various missile and other aerospace vehicle applications. This Aerospace Information Report intends to discuss one particular category known as Cryogenically Fueled Dynamic Power Systems. In this report, "Cryogenically Fueled Dynamic Power Systems" include all open cycle, chemically fueled, dynamic engine power systems which utilize cryogenic fuels and oxidizers. For nearly all practical present day systems, this category is limited to cryogenic hydrogen or hydrogen-oxygen fueled cycles with potential in future, more advanced systems for replacement of oxygen by fluorine. Excluded from the category are static cryogenic systems (e.g., fuel cells) and chemical dynamic power systems which utilize earth storable propellants.