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Aichi Atsuta 31, Ha 60 Model 31, V-12 Engine

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Display Status:

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

Collection Item Summary:

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.

Collection Item Long Description:

Data Source

National Air and Space Museum

Rights

Do not reproduce without permission from the Smithsonian Institution, National Air and Space Museum

Manufacturer

Aichi Aircraft Company (Aichi Kokuki KK)

Designer

Daimler-Benz Aktiengesellschaft

Credit Line

Transferred from the U.S. Navy

Materials

  • Bearings - Steel backed copper lead
  • Crankshaft - Ni/Cr Steel
  • Cylinder blocks - Silicon aluminum alloy
  • Ignition leads - Fabric covered
  • Pistons - Similar to 24S aluminum

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.)

See more items in

National Air and Space Museum Collection

Country of Origin

Japan

Date

1945

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)

Type

PROPULSION-Reciprocating & Rotary

Inventory Number

A19710927000