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Marquardt M-14

The Marquardt Company was set up in 1944 for the purpose of study work into subsonic ram-jet engines. The company has since developed 50.8-centimetre diameter ram-jets capable of supplying power equivalent to 2500hp. A Lockheed F-80 "Shooting Star" fixed-wing aircraft was fitted with this ram-jet and during trial flights was powered solely by it, the normal power source having been switched off.

Development work has also been done on other ram-jet engines as well as on pulse-jet engines to equip target drones.

Marquardt has also produced a helicopter powered by two pulse-jet engines 20.4 centimetres in diameter. This helicopter, a simplified structure in steel tubing, was intended to act as a flying test bed for the pulse-jet engines developed by the Marquardt Company. At each tip of the two-bladed rotor were located the above-mentioned pulse-jet engines. Directional control was ensured by means of a rudder. The M-14 was the first American helicopter to have flown on power provided by two pulse-jet engines.

P.Lambermont "Helicopters and Autogyros of the World", 1958

Marquardt M-14

Technical data for Marquardt M-14

Engine: 2 x pulse-jets, empty weight: 363kg, gross weight: 544kg, cruising speed: 104km/h

Colin, e-mail, 21.11.2016reply

Does anyone have links to or data on the Marquardt 2D airfoil tip-jets for helicopter rotors?

Doug Heidke, e-mail, 07.06.2016reply

I believe he developed Ramjets with two 2-D Dimensional Combustion Chambers with in the tips of the rotors which were more efficient than the cylindrical ones . 7 /6 /2016 is this true?

Val Taylor, e-mail, 19.07.2007reply

is it true that the Marquardt M-14 was uneconomical, not fuel efficient and unstable?

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