Wright R-2600 Twin Cyclone

R-2600

Wright R-2600 Cyclone radial engine
Type	Radial engine
National origin	United States
Manufacturer	Wright Aeronautical
First run	1935
Major applications	Curtiss SB2C Helldiver Douglas A-20 Havoc Grumman TBF Avenger North American B-25 Mitchell
Number built	>50,000
Developed from	Wright R-1820

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

History

In 1935, Curtiss-Wright began work on a more powerful version of their successful R-1820 Cyclone 9. The result was the R-2600 Twin Cyclone, with 14 cylinders arranged in two rows. The 1,600 hp (1,200 kW; 1,600 PS) R-2600-3 was originally intended for the C-46 Commando (being fitted to the prototype CW-20A) and was also the original engine choice for the F6F Hellcat; a running change (one which would not stop production) for the CW-20A, and one in late April 1942 for the second XF6F-1, led to the adoption of the 2,000 hp (1,500 kW; 2,000 PS) Pratt & Whitney R-2800 in its place for both designs. The Twin Cyclone went on to power several important American-designed World War II aircraft, including the A-20 Havoc, B-25 Mitchell, TBF Avenger, SB2C Helldiver, and PBM Mariner.

Over 50,000 R-2600s were built at plants in Paterson, New Jersey, and Cincinnati, Ohio.

Variants

R-2600-1 - 1,600 hp (1,194 kW)
R-2600-3 - 1,600 hp (1,194 kW)
R-2600-6 - 1,600 hp (1,194 kW)
R-2600-8 - 1,700 hp (1,268 kW)
R-2600-9 - 1,700 hp (1,268 kW)
R-2600-12 - 1,700 hp (1,268 kW)
R-2600-13 - 1,700 hp (1,268 kW)
R-2600-19 - 1,600 hp (1,194 kW), 1,660 hp (1,237 kW)
R-2600-20 - 1,700 hp (1,268 kW), 1,900 hp (1,420 kW)
R-2600-22 - 1,900 hp (1,420 kW)
R-2600-23 - 1,600 hp (1,194 kW)
R-2600-29 - 1,700 hp (1,268 kW), 1,850 hp (1,380 kW)
GR-2600-A5B - 1,500 hp (1,118 kW), 1,600 hp (1,194 kW), 1,700 hp (1,268 kW)
GR-2600-A71 - 1,300 hp (969 kW)
GR-2600-C14 - 1,750 hp (1,304 kW)

Applications

Wright R-2600 Cyclone being fitted to a North American B-25 Mitchell, at North American Aviation, Inglewood, California

Specifications (GR-2600-C14BB)

Data from Jane's.^[1]

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)

References

Wikimedia Commons has media related to Wright R-2600 Twin Cyclone.

Notes

↑ Jane's 1998, p. 317.
↑ Witold Liss (1967). The Lavochkin La 5 & 7, number 149. Profile publications Ltd., P.O. Box, 1a North Street, Leatherhead, Surrey, UK. pp. p. 3

Bibliography

Jane's Fighting Aircraft of World War II. London. Studio Editions Ltd, 1998. ISBN 0-517-67964-7

Wright Aeronautical and Lawrance Aero Engine Company aircraft engines

Wright inline engines

E
Gypsy
T-1
T-2
T-3 (V-1950)
T-4
V-720
IV-1460
IV-1560

Lawrance radials

Wright radials

Whirlwind	R-540 R-760 R-790 R-975 R-1510 R-1670

Cyclone	R-1300 R-1750 R-1820 R-2600 R-3350 R-4090

Others	R-1200 R-2160

Wright turbojets

Wright turboprops/turboshafts

United States military piston aircraft engine designation system

H (four-bank H-configuration inline)	H-1640 XH-2240 H-2470 XH-2600 XH-3130 XH-3730 H-4070

I (inverted-V inline)	IV-1430 IV-2040 IV-2220

L (single-bank inline)	L-330 L-365 L-375 L-390 L-410 L-440 L-510 L-825

O (opposed)	O-15 O-40 O-45 O-90 O-100 O-145 O-150 O-170 O-175 O-180 O-190 O-200 (C) O-200 (F) O-205 O-235 O-290 O-300 O-335 O-360 (C) O-360 (L) O-405 O-425 O-435 O-470 O-480 O-520 O-540 (F) O-540 (L) O-550 O-580 O-805 O-1230

R (radial)	R-250 R-265 R-270 R-370 (LB) R-370 (K) R-420 R-440 R-500 R-540 (W) R-540 (K) R-545 R-550 R-600 R-670 R-680 R-720 R-755 R-760 R-790 R-830 R-915 R-975 DR-980 R-985 R-1044 R-1300 R-1340 R-1454 R-1510 R-1535 R-1640 R-1670 R-1690 R-1750 R-1820 R-1830 R-1860 R-2000 R-2060 R-2160 R-2180 R-2600 R-2800 R-3350 R-4090 R-4360 XR-7755

V (upright-V inline)	V-720 V-770 V-1150 V-1237 V-1400 V-1410 V-1440 V-1460 V-1510 V-1560 V-1570 V-1650 (L) V-1650 (P) V-1710 V-1950 V-3420

W (three-bank W-configuration inline)	W-2779

See also: X-1800 US military gas turbine aeroengines Piston engine configurations

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