Wright R-2600

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The Wright R-2600 Cyclone 14 (also called Twin Cyclone) was an American radial engine developed by Curtiss-Wright and widely used in the 1930s and 1940s aircraft.

1 History
2 Variants
3 Specifications (GR-2600-C14)
4 References
5 Related contents

[edit] History

In 1935, Curtiss-Wright began work on a more powerful version of their successful R-1820 Cyclone 9. The result was R-2600 with 14 cylinders arranged in two rows. The engine was used to power several key World War II aircraft including the A-20 Havoc, B-25 Mitchell, and TBF Avenger bombers, and the PBM Mariner flying boat.

Over 50,000 R-2600s were built at plants in Caldwell, NJ and Cincinnati, OH.

[edit] Variants

R-2600-3 - 1,600 hp (1,194 kW)
R-2600-12 - 1,700 hp (1,268 kW)
R-2600-13 - 1,700 hp (1,268 kW)
R-2600-20 - 1,900 hp (1,420 kW)
R-2600-29 - 1,850 hp (1,380 kW)

[edit] Specifications (GR-2600-C14)

General characteristics

Type: 14-cylinder supercharged air-cooled two-row radial engine
Bore: 6.125 in (155.6 mm)
Stroke: 6.312 in (160.2 mm)
Displacement: 2,603 in³ (42.7 L)
Length: 62.06 in (1,576 mm)
Diameter: 55 in (1,397 mm)
Dry weight: 2,045 lb (930 kg)

Components

Valvetrain: Two pushrod-actuated valves per cylinder with sodium-cooled exhaust valve
Supercharger: Single-stage two-speed centrifugal type supercharger, impeller diameter 11 in (280 mm), blower ratio 7.06:1 at slow speed and 10.06:1 at high speed
Fuel system: Stromberg PR48A downdraft carburetor with automatic mixture control
Oil system: Dry sump with one pressure pump and two scavenge pumps
Cooling system: Air-cooled

Performance

Power output:
- 1,750 hp (1,305 kW) at 2,600 rpm at 3,200 ft (975 m) military power
- 1,450 hp (1,080 kW) at 2,600 rpm at 15,000 ft (4,575 m) military power
Specific power: 0.67 hp/in³ (30.6 kW/L)
Compression ratio: 6.9:1
Power-to-weight ratio: 0.86 hp/lb (1.40 kW/kg)