Collection Item Summary:
This engine powered the last generation of piston engine transports, including the Douglas DC-7 and Lockheed Super Constellation. It represents the end of engine-development that began with the famous Wright Whirlwind, and included an entire family of military and commercial piston power plants. The somewhat unique feature of this engine was a turbo compound device, consisting of an exhaust-driven turbine geared to the crankshaft, generating 20 percent additional take-off power without increasing fuel consumption.
The Wright R-3350 Turbo-Cyclone 18 also powered the following aircraft types: Lockheed P2V-7 Neptune patrol bomber, Martin P5M-1 and -2 Marlin patrol flying boat, Fairchild C-119F and G Packet troop and cargo transport, Lockheed C-121 transport, and Canadair CL-28 maritime reconnaissance.
This artifact powered the American Airlines Douglas DC-7C "Flagship Vermont." A total of 374 engines of this model were built between August 1952 and December 1954. A total of 5,656 commercial C18 and 44,536 military R-3350 engines were manufactured.
Collection Item Long Description:
National Air and Space Museum
Do not reproduce without permission from the Smithsonian Institution, National Air and Space Museum
Gift of American Airlines, Inc.
Engine Overall - Steel, Aluminum, Inconel X
- 3-D: 233.2 × 143.8cm, 1620.7kg (91 13/16 × 56 5/8 in., 3573lb.)
- Support: 280.7 × 158.8 × 188.6cm (110 1/2 in. × 62 1/2 in. × 74 1/4 in.)
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National Air and Space Museum Collection
Country of Origin
United States of America
- Type: Reciprocating, 18 cylinders, 2 rows, radial, air-cooled
- Power rating: 2,424 kW (3,250 hp) at 2,900 rpm
- Displacement: 54.9 L (3,350 cu in.)
- Bore and Stroke: 156 mm (6.1 in.) x 160 mm (6.3 in.)
- Weight: 1621 kg (3573 lb)
PROPULSION-Reciprocating & Rotary