Jendrassik Cs-1
Encyclopedia
The Jendrassik Cs-1 was the world's first working turboprop
Turboprop
A turboprop engine is a type of turbine engine which drives an aircraft propeller using a reduction gear.The gas turbine is designed specifically for this application, with almost all of its output being used to drive the propeller...

 engine. It was designed by Hungarian engineer György Jendrassik
György Jendrassik
György Jendrassik , Hungarian physicist and mechanical engineer.Jendrassik completed his education at Budapest's József Technical University, then at the University of Berlin attended lectures of the famous physicists Einstein and Planck. In 1922 he obtained his diploma in mechanical engineering in...

 in 1937, and was intended to power a Hungarian twin-engine heavy fighter
Heavy fighter
A heavy fighter is a fighter aircraft designed to carry heavier weapons or operate at longer ranges. To achieve acceptable performance, most heavy fighters were twin-engined, and many had multi-place crews....

, the RMI-1.

Design and development

The engine was designed by György Jendrassik
György Jendrassik
György Jendrassik , Hungarian physicist and mechanical engineer.Jendrassik completed his education at Budapest's József Technical University, then at the University of Berlin attended lectures of the famous physicists Einstein and Planck. In 1922 he obtained his diploma in mechanical engineering in...

 in 1937. It ran for the first time in 1940, but problems with combustion stability limited the power to 400 hp, from the design goal of 1,000 hp. There was nothing inherently wrong with the design, however, and continued work on the flame cans should have allowed it to develop to full power.

All work on the engine was later stopped when the Hungarian Air Force
Hungarian Air Force
The Hungarian Air Force is the air force branch of the Hungarian Army.- 1918 to Pre–World War II :Following the dissolution of the Austro-Hungarian Monarchy in 1918, a small air arm was established operating surviving aircraft from Hungarian factories and training schools...

 selected the Messerschmitt Me 210
Messerschmitt Me 210
The Messerschmitt Me 210 was a German heavy fighter and ground-attack aircraft of World War II. The Me 210 was designed to replace the Bf 110 in heavy fighter role; design started before the opening of World War II. The first examples of the Me 210 were ready in 1939, but they proved to have poor...

 for the heavy fighter role, and the engine factory converted over to the Daimler-Benz DB 605
Daimler-Benz DB 605
|-See also:-Bibliography:* Gunston, Bill. World Encyclopedia of Aero Engines. Cambridge, England. Patrick Stephens Limited, 1989. ISBN 1-85260-163-9* Jane's Fighting Aircraft of World War II. London. Studio Editions Ltd, 1989. ISBN 0-517-67964-7...

to power it. The prototype RMI-1 was later fitted with these engines in 1944.
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