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Aichi Atsuta 31, Ha 60 Model 31

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


The Aichi Watch and Electric Machinery Company of Japan was established in 1899, and first built Lorraine engines for the Japanese navy under license. In 1931 it began manufacturing its own designs in 1931. The name Atsuta was derived from its factory.

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.

Transferred from the U.S. Navy, Naval Supply Center, Norfolk, Virginia.

Manufacturer: Aichi Aircraft Company (Aichi Kokuki KK)

Designer: Daimler-Benz Aktiengesellschaft

Date: 1945

Country of Origin: Japan

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

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)

Inventory number: A19710927000

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