A low cost ramjet engine of unusual configuration has been developed to propel an expendable subsonic drone in the speed range between 0.6 and 0.4 Mach at attitudes from MSL to 20000 feet. This engine, called the resonating ramjet (RRJ), is configured with a side inlet to permit compact installation of the propulsion unit within the vehicle and the use of a solid rocket booster motor inside the engine itself. For ground launch, the rocket motor accelerates the drone to a Mach number of 0.7 and is then expelled by ram pressure, allowing the ramjet to light and sustain cruising flight. Development and performance testing included direct connect, free jet and in-flight tests. These techniques are briefly reviewed. Measured performance is presented and compared with 'ideal ramjet' performance. (Kursetz)
A subsonic ramjet engine for expendable drones
Ein Staustrahltriebwerk fuer subsonische Geschwindigkeiten zur Verwendung bei kostengeringen Zielflugkoerpern
AIAA-Papers ; 1-3
1978
3 Seiten, 6 Bilder, 1 Quelle
Conference paper
English
A subsonic ramjet engine for expendable drones
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