with external combustion, e.g. scram-jet engines

Full Title

Plants in which the working fluid is used in a jet only, i.e. the plants not having a turbine or other engine driving a compressor or a ducted fan; Control thereof (rocket-engine plants F02K9/00) > characterised by having ram-action compression, i.e. aero-thermo-dynamic-ducts or ram-jet engines > with external combustion, e.g. scram-jet engines