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The Atsuta 31 was a licensed version of the Daimler-Benz DB 601A liquid-cooled, inverted V-12 engine. The Atsuta reduced an aircraft’s frontal area, increasing aerodynamic efficiency. Aichi manufactured 873 Atsuta series engines during World War II.

The Atsuta was the only liquid-cooled engine used operationally by the Japanese naval air force. The Ha 60 Model 31 powered the Aichi M6A1 Seiran, a submarine-borne floatplane bomber, and early versions of the Yokosuka D4Y2 series Suisei carrier-based dive bomber and reconnaissance aircraft.

 Display Status

This object is on display in Boeing Aviation Hangar at the Steven F. Udvar-Hazy Center in Chantilly, VA.

Boeing Aviation Hangar
Object Details
Date 1945 Country of Origin Japan Type PROPULSION-Reciprocating & Rotary Manufacturer Aichi Aircraft Company (Aichi Kokuki KK)
 Designer Daimler-Benz Aktiengesellschaft
 Physical Description Type: Reciprocating, Inverted V, 12 cylinders, liquid cooled, supercharged, fuel injected Power rating: 1,044 kW (1,400 hp) at 2,800 rpm Displacement: 33.9 L (2,069 cu in) Bore and Stroke: 150 mm (5.91 in.) x 160 mm (6.30 in.) Weight: 715 kg (1,576 lb) Dimensions Length 215.0 cm (84 5/8 in.), Width 71.2 cm (28 1/16 in.), Height 106.0 cm (41 3/4 in.)
 Materials Bearings - Steel backed copper lead
Crankshaft - Ni/Cr Steel
Cylinder blocks - Silicon aluminum alloy
Ignition leads - Fabric covered
Pistons - Similar to 24S aluminum
 Inventory Number A19710927000 Credit Line Transferred from the U.S. Navy Data Source National Air and Space Museum Restrictions & Rights Usage conditions apply
For more information, visit the Smithsonians Terms of Use.