Pratt & Whitney R-1830 Twin Wasp

The Pratt & Whitney R-1830 Twin Wasp was an American aircraft engine widely used in the 1930s and 1940s. Produced by Pratt & Whitney, it was a two-row, 14-cylinder, air-cooled radial design. It displaced 1,830 cu in (30.0 L) and its bore and stroke measured 5.5 and 5.5 in (140 and 140 mm), respectively. A total of 173,618 R-1830 engines were built.^[1] An enlarged version with a slightly higher power rating was produced as the R-2000.

Variants

• R-1830-1 - 800 hp (597 kW)
• R-1830-9 - 850 hp (634 kW), 950 hp (708 kW)
• R-1830-11 - 800 hp (597 kW)
• R-1830-13 - 600 hp (447 kW), 900 hp (671 kW), 950 hp (708 kW), 1,050 hp (783 kW)
• R-1830-17 - 1,200 hp (895 kW)
• R-1830-21 - 1,200 hp (895 kW)
• R-1830-25 - 1,100 hp (820 kW)
• R-1830-33 - 1,200 hp (895 kW)
• R-1830-35 - 1,200 hp (895 kW) Fitted with GE B-2 turbosupercharger
• R-1830-41 - 1,200 hp (895 kW) Fitted with GE B-2 turbosupercharger
• R-1830-43 - 1,200 hp (895 kW)
• R-1830-45 - 1,050 hp (783 kW)
• R-1830-49 - 1,200 hp (895 kW)
• R-1830-64 - 850 hp (634 kW), 900 hp (671 kW)
• R-1830-65 - 1,200 hp (895 kW)
• R-1830-66 - 1,000 hp (746 kW), 1,050 hp (783 kW), 1,200 hp (895 kW)
• R-1830-72 - 1,050 hp (783 kW)
• R-1830-82 - 1,200 hp (895 kW)
• R-1830-86 - 1,200 hp (895 kW)
• R-1830-88 - 1,200 hp (895 kW)
• R-1830-90 - 1,200 hp (895 kW)
• R-1830-90-B - 1,200 hp (895 kW)
• R-1830-92 - 1,200 hp (895 kW)
• R-1830-94 - 1,350 hp (1,007 kW)
• R-1830-S1C3-G - 1,050 hp (783 kW), 1,200 hp (895 kW)
• R-1830-S3C4 - 1,200 hp (895 kW)
• R-1830-S3C4-G - 1,200 hp (895 kW)
• R-1830-S6C3-G - 1,100 hp (820 kW)
• R-1830-SC-G - 900 hp (671 kW)
• R-1830-SC2-G - 900 hp (671 kW), 1,050 hp (783 kW)
• R-1830-SC3-G - 1,065 hp (749 kW) Swedish unit built under license by SFA company for Finnish VL Myrsky II

Applications

• Bristol Beaufort (Australian-built production)
• Bloch MB.176
• Burnelli CBY-3
• CAC Boomerang
• CAC Woomera
• Consolidated B-24 Liberator
• Consolidated PBY Catalina
• Consolidated PB2Y Coronado
• Consolidated PB4Y Privateer
• Curtiss P-36 Hawk
• Douglas C-47 Skytrain
• Douglas DC-3
• Douglas DB-7 (early variants only)
• Douglas SBD Dauntless
• Douglas TBD Devastator
• FFVS J 22
• Fokker D.XXI
• Grumman F4F Wildcat
• Lioré et Olivier LeO 453
• Lisunov Li-3 - A Yugoslav version of the Soviet Lisunov Li-2
• Martin Maryland
• Republic P-43 Lancer
• Saab 17
• Saab 18
• Short Sunderland V
• Seversky P-35
• Vickers Wellington IV
• VL Myrsky
• Vultee P-66 Vanguard

Specifications (R-1830-S1C-G)

Data from ^[2]

General characteristics

• Type: Fourteen-cylinder two-row supercharged air-cooled radial engine
• Bore: 5.5 in (139.7 mm)
• Stroke: 5.5 in (139.7 mm)
• Displacement: 1,829.4 in³ (30 l)
• Length: 59.06 in (1,500 mm)
• Diameter: 48.03 in (1,220 mm)
• Dry weight: 1,250 lb (567 kg)

Components

• Valvetrain: Two overhead valves per cylinder
• Supercharger: Single-speed General Electric centrifugal type supercharger, 7.15:1 reduction
• Fuel system: Two-barrel Stromberg carburetor
• Fuel type: 95-100 octane rating gasoline
• Cooling system: Air-cooled
• Reduction gear: Epicyclic gearing, 2:3

Performance

• Power output:
  
  • 1,200 hp (895 kW) at 2,700 rpm for takeoff
  • 700 hp (522 kW) at 2,325 rpm cruise power at 13,120 ft (4,000 m)
• Specific power: 0.66 hp/in³ (29.83 kW/l)
• Compression ratio: 6.7:1
• Specific fuel consumption: 0.49 lb/(hp•h) (295 g/(kW•h))
• Power-to-weight ratio: 0.96 hp/lb (1.58 kW/kg)

See also

Related development

• Pratt & Whitney Wasp series
• Pratt & Whitney R-985 Wasp Junior
• Pratt & Whitney R-1340 Wasp
• Pratt & Whitney R-1535 Twin Wasp Junior
• Pratt & Whitney R-2000 Twin Wasp
• Pratt & Whitney R-2800 Double Wasp
• Pratt & Whitney R-4360 Wasp Major
  

Comparable engines

• BMW 801
• Bristol Hercules
• Fiat A.74
• Gnome-Rhône 14N
• Mitsubishi Kinsei
• Nakajima Sakae
• Shvetsov ASh-82
• Wright R-1820
  

Related lists

• List of aircraft engines
  

References

• Angelucci, Enzo (1988, Revised Edition 2006). Complete Book of World War II Combat Aircraft. VMB Publishers. ISBN 978-88-540-0829-8. 
• Bridgman, Leonard, ed. Jane's All The World's Aircraft 1951–1952. London: Samson Low, Marston & Company, Ltd 1951.

External links

• Pratt & Whitney's R-1830 page