Pratt & Whitney R-1340 Wasp
Pratt & Whitney R-1340 Wasp
| R-1340 Wasp | |
|---|---|
 | |
| The first Pratt & Whitney Wasp | |
| Type | Radial engine |
| National origin | United States |
| Manufacturer | Pratt & Whitney |
| First run | 29 December 1925 |
| Major applications | Boeing 247 de Havilland Canada DHC-3 Otter North American T-6 Texan Sikorsky H-19 Sikorsky S-38 |
| Number built | 34,966 |
| Developed into | Pratt & Whitney R-985 Wasp Junior |
The Pratt & Whitney R-1340 Wasp is an aircraft engine of the reciprocating type that was widely used in American aircraft from the 1920s onward. It was the Pratt & Whitney aircraft company's first engine, and the first of the famed Wasp series. It was a single-row, nine-cylinder, air-cooled, radial design, and displaced 1,344 cubic inches (22 L); bore and stroke were both 5.75 in (146 mm). A total of 34,966 engines were produced.[1]
As well as numerous types of fixed-wing aircraft, it was used to power helicopters, the Agusta-Bell AB.102 and the Sikorsky H-19, and a class of airship, the K-class blimp.
In 2016, it received designation as a Historic Engineering Landmark from the American Society of Mechanical Engineers.[2]
| R-1340 Wasp | |
|---|---|
| |
| The first Pratt & Whitney Wasp | |
| Type | Radial engine |
| National origin | United States |
| Manufacturer | Pratt & Whitney |
| First run | 29 December 1925 |
| Major applications | Boeing 247 de Havilland Canada DHC-3 Otter North American T-6 Texan Sikorsky H-19 Sikorsky S-38 |
| Number built | 34,966 |
| Developed into | Pratt & Whitney R-985 Wasp Junior |
Variants
Note: R for Radial and 1340 for 1340 cubic inch displacement.
- R-1340-7450 hp (340 kW), 600 hp (450 kW)R-1340-8425 hp (317 kW)R-1340-9450 hp (340 kW), 525 hp (391 kW)R-1340-16550 hp (410 kW)R-1340-17525 hp (391 kW)R-1340-19600 hp (450 kW)R-1340-19F600 hp (450 kW)R-1340-21G550 hp (410 kW)R-1340-22550 hp (410 kW)R-1340-23575 hp (429 kW)R-1340-30550 hp (410 kW)R-1340-31550 hp (410 kW)R-1340-33600 hp (450 kW)R-1340-48600 hp (450 kW)R-1340-49600 hp (450 kW)R-1340-AN1550 hp (410 kW), 600 hp (450 kW)R-1340-AN2550 hp (410 kW), 3:2 geared prop shaftR-1340-B450 hp (340 kW)R-1340-D500 hp (370 kW)R-1340-S1D1525 hp (391 kW)R-1340-S1H1-G550 hp (410 kW), 600 hp (450 kW)R-1340-S3H1600 hp (450 kW)R-1340-T1D1520 hp (390 kW)
Applications
Agusta-Bell AB.102
Air Tractor AT-301
Air Tractor AT-401
Ayres Thrush
Bach Air Yacht
Boeing Model 40A
Boeing 247
Boeing F3B
Boeing F4B
Boeing P-12
Boeing P-26 Peashooter
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
Fairchild FB-3
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
Ireland N-2C Neptune
Junkers W 34
Junkers Ju 52
Knoll Aircraft Company KN-3[3]
Kaman HH-43 Huskie
Lockheed Vega 5
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 (helicopter)
Engines on display
Specifications (R-1340-S1H1-G)
Data from Jane's.[8]
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: 1,344 in3 (22 L)
Length: 47.7 in (1,211 mm)
Diameter: 51.75 in (1.314 m)
Dry weight: 930 lb (422 kg)
Components
Valvetrain: Two overhead valves per cylinder
Supercharger: Single-speed centrifugal type supercharger, 1:10 step-up
Fuel system: Two-barrel Stromberg carburetor
Fuel type: 91 octane rating gasoline
Cooling system: Air-cooled
Reduction gear: 3:2
Performance
Power output: 600 hp (447 kW) at 2,250 rpm at 6,200 ft (1,890 m)
Specific power: 0.45 hp/in³ (20.3 kW/L)
Compression ratio: 6:1
Power-to-weight ratio: 0.65 hp/lb (1.05 kW/kg)
See also
Pratt & Whitney Wasp series
Related development
Pratt & Whitney R-985 Wasp Junior
Pratt & Whitney R-1535 Twin Wasp Junior
Pratt & Whitney R-1830 Twin Wasp
Related lists
List of aircraft engines