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In 1934, the Japanese Navy began development of an 18-cylinder, 40 degree angle W-type engine known as the 671 kW (900 shp) Model 94. More powerful versions of this engine were later undertaken, including the YE2A which started development around 1937-38.

A derivative of the YE2A was this W-type engine known as Ken No. 3 (believed to be the YE2H, also Ha 73 Model 01) began its development around 1942, and construction is believed to have been finished about March 1944. The purpose of this design was to promote aircraft streamlining and thus speed. The intended airframe application is unknown, but the engine design is for a pusher installation. The engine was experimentally tested, but there is no record indicating that it was test flown.

None of the high power liquid-cooled engines under development by Japan reached operational status by war’s end, and, following the war, the focus of international engine development turned toward turbine engines.

 Display Status

This object is not on display at the National Air and Space Museum. It is either on loan or in storage.
Object Details
Date Circa World War II Country of Origin Japan Type PROPULSION-Reciprocating & Rotary Physical Description Type: Reciprocating, 18 cylinders, W-type, liquid cooled, supercharged Power rating: 1,864 kW (2,500 hp) at Unknown rpm Displacement: 47.5 L (2,898 cu in.) Bore and Stroke: 145 mm (5.71 in.) x 160 mm (6.30 in.) Weight: 1,196 kg (2,633 lb) Approximate Dimensions Height 114.3 cm (45 in.), Width 111.8 cm (44 in.), Depth 246.4 cm (97 in.)
 Materials Steel, Aluminum, Copper, Magnesium, Rubber, Textile, Preservative coating
 Inventory Number A19670123000 Credit Line Transferred from the U.S. Air Force Museum Data Source National Air and Space Museum Restrictions & Rights Usage conditions apply
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