Authors are investigating a concept of pre-cooled turbojet engine for Two-Stage-To-Orbit (TSTO) spaceplane. In this study, the engine system is designed with some assumptions. Technological problems and operational limits of the engine are clarified by an engine performance analysis. Then, flight performance of the engine is compared with some air-breathing engines such as: pre-cooled air turbo ramjet, turbo-ramjet and rocket-ramjet Sizes and mass of engines are estimated by analogical estimations with use of a database of existing engines. As a result, pre-cooled engines brought better payload performance than other engines.

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