This is a real blueprint, expertly restored from original plans and vintage design drawings. — measuring a generous 42"x 30".
Nakajima's Sakae Prosperity was a two-row, 14-cylinder air-cooled two row radial engine used in many (including the legendary Mitsubishi Reisen A6M Zero Fighter) Japanese aircraft during World War II.
As installed in a Mitsubishi A6M3 Zero, the Sakae 21 radial engine developed 1,020 hp. at 2,600 rpm. at 6,400 ft., turning a... continues below
Continued from above… ft., turning a 10 ft. 3-in, diameter constant speed propeller, which is very similar to Hamilton Standard design. "Sakae" was the navy designation; the army called the first of the series the Ha-25 and later versions were designated Ha105, Ha115. Navy designations were NK1 Sakae 10, 20 and 30 series.
A total of 21,166 were made by Nakajima; 9,067 were manufactured by other firms.