FIELD: manufacture of engines; aircraft hybrid air-jet engines. SUBSTANCE: at increase of flying speed and after achievement of supersonic speed engine plant is shifted from motor compressor mode to mode of ramjet engine through reducing power supplied to fan and maintaining degree of increasing pressure close to unity. EFFECT: reduction of resistance to air flow at minimum power required for maintenance of rotation of fan; enhanced economical efficiency due to use of piston engine as compared with engine plants using gas turbines. 5 cl, 1 dwg
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