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| | Japanese |
 | | Despite the Yokosuka Naval Air Arsenal's sequential development of and progress with ever more powerful engines, including W-12, V-12, W-18, and X-24 configurations, it could not keep up with the even faster development of high power air-cooled radial engines. |
 | | The first letter, Y, is the capital of the manufacturer, Yokosuka Naval Air Arsenal. |
 | | The fourth letter, A, B, and E, means the order of modification of the engine starting from A. Thus, these model designations means the third liquid-cooled engine developed by the Yokosuka Naval Air Arsenal. |
| www.enginehistory.org /japanese.htm (819 words) |
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