Gnome-Rhône Mistral Major
| Industry | Aircraft engines |
|---|---|
| Founded | 1920s |
| Headquarters | France |
The Gnome-Rhône 14K Mistral Major was a two-row, 14-cylinder air-cooled radial engine that served as Gnome-Rhône's flagship aircraft powerplant prior to World War II. It gained widespread acclaim, resulting in extensive licensed manufacturing throughout Europe and Japan, and powered numerous aircraft models.
Design and development
Beginning in 1922, Gnome-Rhône produced the licensed nine-cylinder single-row Bristol Jupiter radial engine until roughly 1930, alongside the smaller five-cylinder Bristol Titan. From 1926 onward, they initiated development of the "K series" single-row radials inspired by the Titan design, evolving from the 5K Titan to the 7K Titan Major and culminating with the 9K Mistral. By 1930, this series had reached a production volume of approximately 6,000 units.
To address the need for more powerful engines suitable for larger aircraft, Gnome-Rhône transformed the 7K into a two-row configuration—designated as the 14K Mistral Major—with initial trials conducted in 1929. This engine became a benchmark for twin-row radial designs during the 1930s and was widely adopted under license. Licensed manufacturers included Industria Aeronautică Română (Romania), Manfred Weiss (Hungary), Alvis (United Kingdom), Tumansky (Soviet Union), Walter (Czechoslovakia), as well as Italian firms Isotta Fraschini and Piaggio. In Japan, Nakajima obtained a license but subsequently developed their own engines influenced by the design.
Variants
- 14Kbr
- Equipped with reduction gearing
- 14Kbrs
- Supercharged variant featuring reduction gearing
- 14Kdr
- Incorporates reduction gearing
- 14Kds
- Equipped with supercharger
- 14Kdrs
- Supercharged with reduction gearing
- 14Kes
- Supercharged version with left-hand rotation
- 14Kfs
- Supercharged variant with right-hand rotation (Kers)
- 14Kirs
- Supercharged with reduction gearing and left-hand rotation
- 14Kjrs
- Supercharged with reduction gearing and right-hand rotation (Kirs)
- 14Knrs
- Supercharged with reduction gearing, left-hand rotation
- 14Kors
- Supercharged with reduction gearing, right-hand rotation (Knrs)
- Alvis Pelides
British adaptation utilizing local fasteners; only 15 units completed before cancellation due to lack of Air Ministry support.
- Isotta Fraschini K.14
- Produced under license in Italy by Isotta Fraschini
- IAM K14
- Licensed variant manufactured in Yugoslavia
- IAR K14
- Licensed model produced in Romania
- Manfréd Weiss WM K-14
- Hungarian licensed production
- Piaggio P.XI
- Italian licensed derivative
- Piaggio P.XIX
- Enhanced compression version of the Piaggio P.XI
- Tumansky M-85
- Soviet licensed production by Tumansky
- Tumansky M-86
- Upgraded M-85 delivering 960 hp (715 kW) through increased supercharging and higher compression ratio.
- Tumansky M-87
- Tumansky M-88
- Walter Mistral Major
- ИАМ K.14
Sources
- Danel, Raymond and Cuny, Jean. French Bombing and Reconnaissance Aviation 1918-1940 Docavia no.12, Editions Larivière