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Gnome-Rhône 9K
Tumansky M-75
Weiss MW 9K Mistral
I.A.R. 9KIc40




The Gnome-Rhône 9K Mistral was a nine-cylinder 550 hp (405 kW) to 700 hp air-cooled radial engine, that started life as an enlarged Gnome-Rhône 7K with two extra cylinders.

The Gnome-Rhône 7K itself was an enlarged version of the Gnome-Rhône 5K which was derived from a licensed version of the Bristol Titan . A redesign of the cylinders is indicated by the K suffix. The 9K was followed by the larger and more powerful 14-cylinder twin row Gnome-Rhône 14K.




The 9K was also produced in the Soviet Union as the M-75 at factory No. 29 in Zaporozhye. Only small numbers were built and it was dropped in favor of the M-25 a version of the Wright Cyclone and the M-85 a version of the 14K Mistral Major.


The 9K was license produced by Hungarian company Weiss Manfréd Repülogép- és Motorgyár Rt. (WM Rt, the aircraft engine factory of Manfred Weiss). The engine was used successfully in the MÁVAG Héja and Weiss WM-21 Sólyom aircraft.

Licence production in Romania by Industria Aeronautică Română (IAR) was carried out as the I.A.R. 9KIc40.

I.A.R. 9KIc40
Weiss MW 9K Mistral Tumansky M-75


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Type: Nine-cylinder air-cooled radial engine.
Bore: 5.75 in (146 mm)
Stroke: 6.5 in (165 mm)
Displacement: 1,517in³ (24.9 Liters)
Fuel system: Carburetor
Cooling system: Air-cooled


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