The Nakajima Mamoru (護, Preserve) engine was a 14-cylinder, air-cooled, two-row radial engine of 1870 hp. The Nakajima model designation for this engine was NAK while it was an experimental project, in service it was known as the NK7, and known as the Ha-103 by the Army and "Mamori" or "Mamoru" by the Navy.
The Nakajima Mamoru (護, Preserve) engine was a 14-cylinder, air-cooled, two-row radial engine of 1870 hp. The Nakajima model designation for this engine was NAK while it was an experimental project, in service it was known as the NK7, and known as the Ha-103 by the Army and "Mamori" or "Mamoru" by the Navy.
Source: Wikipedia "Nakajima Mamoru" · CC BY-SA 4.0
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