Pratt & Whitney R-1340 Wasp

R-1340 Wasp
A preserved Pratt & Whitney R-1340
Type	Radial engine
National origin	United States
Manufacturer	Pratt & Whitney
First run	29 December 1925

The Pratt & Whitney R-1340 Wasp was a reciprocating engine widely used in American aircraft from the 1920s onward. It was the company's first engine, and the first of the famed Wasp family. It was a single-row, nine-cylinder air-cooled radial design, and displaced 1,344 in³ (22 L); bore and stroke were both 5.75 in (146.05 mm). A total of 34,966 engines were produced.

Variants

• R-1340-7 — 450 hp (336 kW), 600 hp (447 kW)
• R-1340-8 — 425 hp (317 kW)
• R-1340-9 — 450 hp (336 kW), 525 hp (391 kW)
• R-1340-16 — 550 hp (410 kW)
• R-1340-17 — 525 hp (391 kW)
• R-1340-19 — 600 hp (447 kW)
• R-1340-19F — 600 hp (447 kW)
• R-1340-21G — 550 hp (410 kW)
• R-1340-22 — 550 hp (410 kW)
• R-1340-23 — 575 hp (429 kW)
• R-1340-30 — 550 hp (410 kW)
• R-1340-31 — 550 hp (410 kW)
• R-1340-33 — 600 hp (447 kW)
• R-1340-48 — 600 hp (447 kW)
• R-1340-49 — 600 hp (447 kW)
• R-1340-AN1 — 550 hp (410 kW), 600 hp (447 kW)
• R-1340-AN2 — 550 hp (410 kW), 3:2 geared prop shaft
• R-1340-B — 450 hp (336 kW)
• R-1340-D — 500 hp (373 kW)
• R-1340-S1H1-G — 550 hp (410 kW), 600 (447 kW)
• R-1340-S3H1 — 600 hp (447 kW)

Applications

• Agusta-Bell AB.102
• Air Tractor AT-301
• Air Tractor AT-400
• Ayres Thrush
• Bach Air Yacht
• Boeing Model 40A
• Boeing 247
• Boeing F3B
• Boeing F4B
• Boeing P-12
• Boeing P-26
• Boeing P-29
• CAC Ceres
• CAC Wirraway
• Curtiss Falcon
• Curtiss F7C Seahawk
• Curtiss O-52
• Curtiss P-6S Hawk
• Curtiss SOC Seagull
• de Havilland Canada DHC-3 Otter
• Douglas Dolphin
• Fokker F.10
• Fokker F.32
• Ford Trimotor
• Gee Bee R-1
• Gee Bee R-2 Super Sportster
• Gee Bee R 1/2 Super Sportster
• Gee Bee Z
• Gee Bee QED

• Grumman Mallard
• Grumman Ag Cat
• Howard DGA-6
• Junkers W 34
• Junkers Ju 52

Pratt & Whitney R-1340 installed in a T-6 Texan

• Kaman HH-43 Huskie
• Lockheed Vega
• Lockheed Model 8 Sirius
• Lockheed Model 9 Orion
• Lockheed Model 10-C & 10-E Electra
• Lockheed XC-35
• Loening OL-8
• Noorduyn Norseman
• North American BC-1
• North American T-6, SNJ Texan/Harvard
• Northrop Alpha
• Northrop C-19 Alpha
• Scottish Aviation Twin Pioneer
• Sikorsky H-19
• Sikorsky S-38
• Thomas-Morse XP-13A Viper
• Vought O2U Corsair
• Wedell-Williams Model 45
• Westland Whirlwind

Specifications (R-1340-S3HI)

Data from

General characteristics

• Type: Nine-cylinder single-row supercharged air-cooled radial engine
• Bore: 5.75 in (146 mm)
• Stroke: 5.75 in (146 mm)
• Displacement: 1,343.8 in³ (22.02 l)
• Length: 44.06 in (1,119 mm)
• Diameter: 51.38 in (1,305 mm)
• Dry weight: 805 lb (365 kg)

Components

• Valvetrain: Two overhead valves per cylinder
• Supercharger: Single-speed centrifugal type supercharger, 10:1 reduction
• Fuel system: Two-barrel Stromberg carburetor
• Fuel type: 80 octane rating gasoline
• Cooling system: Air-cooled

Performance

• Power output: 542 hp (404 kW) at 2,200 rpm at 5,000 ft (1,525 m)
• Specific power: 0.4 hp/in³ (18.36 kW/l)
• Compression ratio: 6.0:1
• Specific fuel consumption: 0.44 lb/(hp·h) (270 g/(kW·h))
• Oil consumption: 0.32 oz/(hp·h) (12 g/(kW·h))
• Power-to-weight ratio: 0.67 hp/lb (1.11 kW/kg)

See also

• Pratt & Whitney Wasp series
• Pratt & Whitney R-985 Wasp Junior
• Pratt & Whitney R-1535 Twin Wasp Junior
• Pratt & Whitney R-1830 Twin Wasp

References

Bibliography

• Gunston, Bill. World Encyclopedia of Aero Engines. Cambridge, England. Patrick Stephens Limited, 1989. ISBN 1-85260-163-9

External links

• "Index of Wasp & R-1340 Designated Engines", a scanned Pratt & Whitney reference document from 1956 detailing the different Wasp versions, their specifications, and the aircraft they were installed in.
• Pratt & Whitney's R-1340 page