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Wright Turbo-Cyclone 18R-3350-TC Radial Engine


Display Status:

This object is on display in the America by Air exhibition at the National Air and Space Museum in Washington, DC.

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:

Data Source

National Air and Space Museum


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


Wright Aeronautical

Credit Line

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.)

See more items in

National Air and Space Museum Collection

Country of Origin

United States of America



Physical Description

  • 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

Inventory Number