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==Size==
The size of an engine has to be established within the engine installation envelope agreed during the design of the aircraft.
The thrust governs the flow area hence size of the engine. A criterion of pounds of thrust per square foot of compressor inlet is a figure of merit. The first operational turbojets in Germany had axial compressors to meet a 1939 request from the German Air Ministry to develop engines producing 410 lb/sq ft.<ref>{{Cite book |url=https://link.springer.com/book/10.1007/978-3-642-18484-0
==Cost==
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