graduate

Mamoru Aircraft Engine


Photograph of Mamoru aircraft engine

© Mikael Olrog (preservedaxisaircraft.com). Used by permission.

The Nakajima Mamoru was an air-cooled 14-cylinder double-row radial engine with a nominal power rating of 1800 horsepower (1342kW), and was essentially a scaled-up Ha-25. It was also known as the NK7 and as the Ha-103 by the Army, though the Army never made any operational use of it. The engine was considered economical on fuel and had considerable potential for development, but it had some teething problems. As a result, the Japanese Navy, in an uncharacteristic effort to economize resources, demanded that Nakajima cease production of the engine in favor of more proven designs such as the Sakae and Homare. The Mamoru was thus used only on early models of the B6N"Jill".

References

Francillon (1979)

Goodwin and Starkings (2017)
Gunston (2006)



Valid HTML 4.01 Transitional