The Marquardt RJ43-MA were

ramjet A ramjet, or athodyd (aero thermodynamic duct), is a form of airbreathing jet engine that uses the forward motion of the engine to produce thrust. Since it produces no thrust when stationary (no ram air) ramjet-powered vehicles require an as ...

engines used on the

CIM-10 Bomarc The Boeing CIM-10 BOMARC (Boeing Michigan Aeronautical Research Center) (IM-99 Weapon System prior to September 1962) was a supersonic ramjet powered long-range surface-to-air missile (SAM) used during the Cold War for the air defense of Nor ...

missile, the D-21 drone, and the AQM-60. They were engineered and built by the

Marquardt Corporation Marquardt Corporation was an aeronautical engineering firm started in 1944 as ‘’’Marquardt Aircraft Company’’’ and initially dedicated almost entirely to the development of the ramjet engine. Marquardt designs were developed from th ...

. *Thrust: :Marquardt RJ43-MA-3 ramjet; 51 kN (11500 lb)Astronautix: Bomarc
:Marquardt RJ43-MA-7 ramjet; 53 kN (12000 lb) :Marquardt RJ43-MA-11 ramjet; 53 kN (12000 lb) :Marquardt RJ43-MA-20S4 ramjet; 7.3 kN (1,500 lb @ 95,000 ft.) *Thrust/weight ratio: ~40
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References

Ramjet engines {{aircraft-engine-stub