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- Nakajima Homare 12, Ha 45 Model 12, 2-Row, Radial 18 Engine
Nakajima Homare 12, Ha 45 Model 12, 2-Row, Radial 18 Engine
Object Details
- Physical Description
- Type: Reciprocating, 18 cylinders, 2-rows, radial, air cooled
- Power rating: 1,339 kW (1,795 hp) at 2,900 rpm
- Displacement: 35.9 L (2,195 cu in.)
- Bore and Stroke: 130 mm (5.1 in.) x 150 mm (5.9 in.)
- Weight: Unknown
- Summary
- The Homare (Honor) was Japan’s most-used engine in the latter years of World War II. It had a very high specific output, incorporating for the first time in a Japanese engine, a steel crankcase, dynamic balancers, a dual magneto with a remote distributor (on the nose), and a nose sump pump. Its supercharger drive followed a Wright design, with a planetary reduction gear in series with the high gear for obtaining a lower compression ratio. All models suffered from unreliability, service difficulty (particularly when first entering service), and vibration.
- The artifact powered the Yokusuka P1Y1 Ginga (Milky Way) (Allied Code Name FRANCES) twin- engine aircraft for low-altitude torpedo and dive-bombing attacks. Several of these aircraft carried out Kamikaze suicide attacks against American warships. This particular NK9C (Ha45-12) engine model also powered the Aichi B7A2 Ryusei (Shooting Star) single engine torpedo bomber (Allied Code Name GRACE), the largest and heaviest Japanese carrier-based aircraft to fly in World War II.
- Credit Line
- Transferred from the U.S. Air Force
- Data Source
- National Air and Space Museum
- Date
- Circa World War II
- Inventory Number
- A19601985000
- Manufacturer
- Nakajima Hikoki K. K.
- Restrictions & Rights
- Usage conditions apply
- Type
- PROPULSION-Reciprocating & Rotary
- Materials
- Ferrous Alloy
- Non-Magnetic MetalWood
- Organic Fiber Fabric
- Unknown Coating
- Paint
- Copper Alloy
- Possible Asbestos
- Adhesive Tape
- Dimensions
- Other: 3 ft. 10 1/2 in. × 4 ft. 8 in. × 6 ft. 4 in. × 4 ft. 6 in. (118.1 × 142.2 × 193 × 137.2cm)
- Approximate (Width and Length of Stand and Height of Engine): 121.9 × 134.6 × 185.4cm (4 ft. × 4 ft. 5 in. × 6 ft. 1 in.)
- Country of Origin
- Japan
- See more items in
- National Air and Space Museum Collection
- Record ID
- nasm_A19601985000
- Usage
- Not determined