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General characteristics

* Type: Twin-row 18-cylinder radial engine
* Bore: 6.125 in (155.6 mm)
* Stroke: 6.312 in (160.2 mm)
* Displacement: 3,347 in3 (54.56 L)
* Length: 76.26 in (1,930 mm)
* Diameter: 55.78 in (1,420 mm)
* Dry weight: 2,670 lb (1,212 kg)

Components

* Valvetrain: Pushrod, two valves per cylinder
* Supercharger: Two-speed single-stage
* Fuel system: Chandler-Evans downdraft carburetor
* Fuel type: 100/130
* Oil system: Dry sump
* Cooling system: Air cooled

Performance

* Power output: 2,200 hp at 2,800 rpm (takeoff power)
* Specific power: 0.66 hp/in³
* Compression ratio: 6.85:1
* Power-to-weight ratio: 0.82 hp/lb