Jendrassik Cs-1 Turboprop Engine

[davebender]

Tails Through Time
Early prototypes had technical problems but so does almost every new engine design.

Could Jendrassik Cs-1 turboprop engine have been developed to the point of mass production? First run during 1940. Historical development stopped during 1941. Considering all the problems Germany had with BMW801 radial engine I think the Hungarian designed turboprop would have given them a second iron in the fire if it had been enlarged to 1,600hp. Runs on low octane fuel too.

 

[FLYBOYJ]

Tails Through Time
Early prototypes had technical problems but so does almost every new engine design.

Could Jendrassik Cs-1 turboprop engine have been developed to the point of mass production? First run during 1940. Historical development stopped during 1941. Considering all the problems Germany had with BMW801 radial engine I think the Hungarian designed turboprop would have given them a second iron in the fire if it had been enlarged to 1,600hp. Runs on low octane fuel too.

The artilce states the best he got was 400 hp. Nothing is mentioned about the gear box which on turboprops is a big factor with regards to performance and reliability. I think it was a good idea that was ahead of its time but probably not attainable during the period it was being developed.

 

[tomo pauk]

The Germans themselves have had enough problems developing producing the jet engines prior 1944. That is without reduction gear to worry about. The gas turbine might use the lower grade fuel, diesel etc. but it will use it more than the piston engine; much more for ww2 technology.
The 'pure' jet, workable and mass produced, would be a better use of resources. It will have less problems to propel the aircraft above 500, let alone above 450 mph, too.

 

[Shortround6]

The 11 stage turbine might have been a bit of a problem. Most jets using one or two stage turbines at the time. Any turbine design for the Germans that required high temperature alloy blades ( or fancy fabrication) should use the smallest number of blades possible in order to be manufactured in quantity.

Gyrogy Jendrassik started his design before such considerations became really important and certainly deserves more credit than he commonly gets but the engine sounds overly complicated for what it offered compared to late war/early post war engines, but that is one of the penalties in being a pioneer. The war time and early post war engines seemed to max out at 6 stage turbines in the Metropolitan-Vickers with 2 stages to drive the compressor and 4 stages to drive either an aft fan/prop or bypass turbo fan. Otherwise I think 3 stages was the max in engines that actually saw service.

 

[johnbr]

Jendrassik Cs-1 Engine

 

[johnbr]

Jendrassik Cs-1 Engine
Axial-flow design with 15-stage compressor and 7-stage turbine, it incorporated many modern features. These included a rigid compressor-turbine rotor assembly carried on front and rear bearings. There was a single annular combustion chamber, of reverse-flow configuration to shorten the engine, air cooling of the turbine discs and turbine blades with extended roots to reduce heat transfer to the disc. The annular air intake surrounded a reduction gear for propeller drive takeoff, and the exhaust duct was also annular.[1]

With predicted output of 1,000 bhp at 13,500 rpm the Cs-1 stirred interest in the Hungarian aircraft industry with its potential to power a modern generation of high-performance aircraft, and construction was begun of a twin-engined fighter-bomber, the Varga RMI-1 X/H, to be powered by it.

The first bench run took place in 1940, becoming the world's first turboprop engine to run. However, although the design was inherently sound, combustion problems were experienced which limited the output to around 400 bhp.] 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.

Work on the engine stopped in 1941 when the Hungarian Air Force selected the Messerschmitt Me 210 for the heavy fighter role, and the engine factory converted over to the Daimler-Benz DB 605 to power it. The prototype RMI-1 was later fitted with these engines in 1944.

 

[johnbr]

Here is jet engine he designed in 1934