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© 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
Goodwin and
Starkings (2017)
Gunston (2006)
The Pacific War Online Encyclopedia © 2009, 2019 by Kent G. Budge. Index
