Mitsubishi Ha 42 Model 41 Ru (Ha 214 Ru), Radial 18 Engine
date: label: Date
content: Circa World War II
name: label: Manufacturer
content: Mitsubishi Jukogyo K. K.
notes: label: Physical Description
content: Type: Reciprocating, 18 cylinders, 2 rows, radial, air cooled
label: Physical Description
content: Power rating: 1,715 kW (2,300 hp) at 2,500 rpm
label: Physical Description
content: Displacement: 54.1 L (3,300 cu in.)
label: Physical Description
content: Bore and Stroke: 150 mm (5.91 in.) x 170 mm (6.69 in.)
label: Physical Description
content: Weight: 1,235 kg (2,723 lb)
label: Physical Description
content: Outside dual superchargers; Fuel injected; Cooling fan; Two-speed reduction gearing (0.588 and 0.457); Push rods for rear cylinders at the rear of the engine; Cuno-type rotary oil screen (Nakajima-type); Manufactured between 1940-45.
label: Physical Description
content: Missing starter, generator, carburetor, spark plugs and data plate; On stand.
label: Summary
content: Mitsubishi was the first and largest series producer of Japanese engines during World War II, with a 1937 Pratt & Whitney arrangement possibly contributing to this success. This 18-cylinder, two-row, air cooled aircraft engine incorporated two-speed reduction gearing, a cooling fan, and twin transverse superchargers to achieve two stage supercharging.
label: Summary
content: Four of these engines were to power the Kawasaki Ki-91 Army Experimental Long-range Bomber, which was to be larger than the Boeing B-29 and have a 4,474 km (2,796 miles) radius of action. The design of this bomber began in May 1943, and a prototype was under construction at the end of 1944, but planned production was suspended in February 1945 when tooling was destroyed during a B-29 raid before the prototype was completed. Between 1940 and 1945, a total of 2,813 Mitsubishi Ha 42 series (all models) were built.
place: label: Country of Origin
content: Japan
setName: label: See more items in
content: National Air and Space Museum Collection
creditLine: label: Credit Line
content: Transferred from the U.S. Navy
dataSource: label: Data Source
content: National Air and Space Museum
identifier: label: Inventory Number
content: A19710895000
objectType: label: Type
content: PROPULSION-Reciprocating & Rotary
objectRights: label: Restrictions & Rights
content: CC0
physicalDescription: label: Materials
content: Aluminum, Paint, Steel, Magnesium, Paper, Stainless Steel, Rubber, Copper
label: Dimensions
content: Other: 52 3/4 x 92 5/8in. (134 x 235.2cm)
label: Dimensions
content: Approximate (with stand): 160.02 x 218.44 x 161.29cm (5ft 3in. x 7ft 2in. x 5ft 3 1/2in.)
label: Dimensions
content: Approximate (Weight on Stand): 1551.3kg (3420lb.)
label: Dimensions
content: Diameter 134 cm (52.75 in.), Length 235.2 cm (92.63 in.)