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Origin of Mitsubishi Kinsei engine
Mitsubishi Kinsei engine DID NOT developed from P&W R-1689 Hornet just because Hornet was single raw 9-cylinder engine but A8 Mitsubishi Kinsei was 14-cylinder 2-raw engine from the very beginning. It has bore/stroke size absolutely different from P&W R-1689 Hornet. So its origin from P&W R-1689 Hornet is false!!!
Mitsubishi's only two-row radial licenses were for Armstrong-Siddeley engines, the largest being the Leopard of 1932. This lineage is very apparent, right up to the late model Kinsei and Kasei variants, and even the 18-cylinder Ha-104.
So true Kinsei origin was Armstrong-Siddeley design & Tiger engine is the most close relative. It had bore 139.7 mm (Kinsei - 140 mm), stroke 152,4 mm (Kinsei - 150 mm). It is apparent that these two engines are almost identical.
See also a short timelist of Mitsubishi engines development http://www.mhi.co.jp/aero/introduction/contents/history_e.html --Aurum (talk) 08:53, 24 June 2011 (UTC)
Engines based on Mitsubishi A8 Kinsei design
Besides the development of the Kinsei engine itself, Mitsubishi started design of its more spacious successor. Firstly it was A6 Shinten (Navy) Ha-6(Army) engine. It had bore 140 mm, stroke 170 mm. And further the A6 Shinten engine was redisigned into A10 Kasei that had 150 mm bore & 170 mm stroke.