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	Soko 522 ; Boeing P-26 Peashooter ; de Havilland Canada DHC-3 Otter ; North American T-6 Texan ; Sikorsky H-19 ; Junkers Ju 52
Produced	1926–
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]

Variants[edit]

Note: R for Radial and 1340 for 1340 cubic inch displacement.

R-1340-7: 450 hp (340 kW), 600 hp (450 kW)
R-1340-8: 425 hp (317 kW)
R-1340-9: 450 hp (340 kW), 525 hp (391 kW)
R-1340-16: 550 hp (410 kW)
R-1340-17: 525 hp (391 kW)
R-1340-19: 600 hp (450 kW)
R-1340-19F: 600 hp (450 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 (450 kW)
R-1340-48: 600 hp (450 kW)
R-1340-49: 600 hp (450 kW)
R-1340-AN1: 550 hp (410 kW), 600 hp (450 kW)
R-1340-AN2: 550 hp (410 kW), 3:2 geared prop shaft
R-1340-B: 450 hp (340 kW)
R-1340-D: 500 hp (370 kW)
R-1340-S1D1: 525 hp (391 kW)
R-1340-S1H1-G: 550 hp (410 kW), 600 hp (450 kW)
R-1340-S3H1: 600 hp (450 kW)
R-1340-T1D1: 520 hp (390 kW)

Applications[edit]

Engines on display[edit]

There are a Wasp A and three Wasp C's on display at the New England Air Museum, Bradley International Airport, Windsor Locks, CT.^[4]^[5]^[6]^[7]

Specifications (R-1340-S1H1-G)[edit]

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 cu in (22.02 L)
Length: 47.7 in (1,210 mm)
Diameter: 51.75 in (1,314 mm)
Dry weight: 930 lb (420 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 (450 kW) at 2,250 rpm at 6,200 ft (1,900 m)
Specific power: 0.45 hp/cu in (20.5 kW/L)
Compression ratio: 6:1
Power-to-weight ratio: 0.65 hp/lb (1.07 kW/kg)

References[edit]

Notes[edit]

^ Pratt&Whitney R-1340 page Retrieved: 25 October 2008
^ "Pratt’s first engine gets historic designation" from Hartford Business Journal, published February 1st Retrieved: 7 April 2016
^ "Knoll KN-3". Western Flying. August 1929.
^ http://neam.org/index.php?option=com_content&view=article&layout=edit&id=1119 "Pratt & whitney R-1340 Wasp A"
^ http://neam.org/index.php?option=com_content&view=article&layout=edit&id=1113 "Pratt & Whitney R-1340 Wasp C Cutaway"
^ http://neam.org/index.php?option=com_content&view=article&layout=edit&id=1120 "Pratt & Whitney R-1340-0 Wasp C"
^ http://neam.org/index.php?option=com_content&view=article&layout=edit&id=1122 "Pratt & Whitney Roscoe Turner R-1340 Wasp Engine"
^ Bridgman 1994, p. 81d.

Bibliography[edit]

Bridgman, Leonard. Jane's All the World's Aircraft 1945-46. Hammersmith, London: HarperCollinsPublishers (1994 reprint). ISBN 000 470831-8
Gunston, Bill. World Encyclopedia of Aero Engines: From the Pioneers to the Present Day. 5th edition, Stroud, UK: Sutton, 2006.ISBN 0-7509-4479-X
White, Graham. Allied Aircraft Piston Engines of World War II: History and Development of Frontline Aircraft Piston Engines Produced by Great Britain and the United States During World War II. Warrendale, Pennsylvania: SAE International, 1995. ISBN 1-56091-655-9

External links[edit]

"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.
"Radial Engines". Covington Aircraft. Retrieved October 26, 2019.
There is a "Pratt & Whitney 1340N Radial Engine" in use on a T-6 Texan at Pacific Warbirds, Oahu, HI

[1] Pratt&Whitney R-1340 page Retrieved: 25 October 2008

[2] "Pratt’s first engine gets historic designation" from Hartford Business Journal, published February 1st Retrieved: 7 April 2016

[3] "Knoll KN-3". Western Flying. August 1929.

[4] ttp://neam.org/index.php?option=com_content&view=article&layout=edit&id=1119 "Pratt & whitney R-1340 Wasp A"

[5] ttp://neam.org/index.php?option=com_content&view=article&layout=edit&id=1113 "Pratt & Whitney R-1340 Wasp C Cutaway"

[6] ttp://neam.org/index.php?option=com_content&view=article&layout=edit&id=1120 "Pratt & Whitney R-1340-0 Wasp C"

[7] ttp://neam.org/index.php?option=com_content&view=article&layout=edit&id=1122 "Pratt & Whitney Roscoe Turner R-1340 Wasp Engine"

[8] Bridgman 1994, p. 81d.

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v t e Pratt & Whitney aircraft engines
Radial engines	R-985 R-1340 R-1535 R-1690 R-1830 R-1860 R-2000 R-2060 R-2180-A R-2180-E R-2270 R-2800 R-4360 Double Wasp Hornet (A) Hornet B Twin Hornet Twin Wasp (R-1830) Twin Wasp (R-2000) Twin Wasp E Twin Wasp Junior Wasp series Wasp Wasp Junior Wasp Major Yellow Jacket
H piston engines	X-1800/XH-2600 XH-3130 (XH-3730)
Free-piston gas turbines	PT1
Turbojets	JT3C JT4A JT6 JT7 JT8A JT9 JT11 JT12 J42 J48 J52 J57 J58 J60 J75 J91
Turbofans	GP7000† JT3D JT4D JT8D JT9D JTF10 JTF10A JT10D JTF14 JTF16 JTF17 JTF22 PW1000G PW1120 PW2000 PW4000 PW5000 PW6000 RTF-180† STF200 SuperFan† V2500† F100 F105 F117 F119 F135 F401 RM8† TF30 TF33 XA101 XA103
Turboprops/Turboshafts	APW34† JFTD12 PT2 PT3 PT4 PT5 T34 XT45 T52 XT57 T73 T800-APW† T900†
Propfans	578-DX†
Rocket engines	RL10
Aeroderivative gas turbine engines	GG3/FT3 GG4/FT4 FT8
Subsidiaries	Pratt & Whitney Canada Pratt & Whitney Rocketdyne
Key people	Leonard S. Hobbs George J. Mead Wright Parkins Perry Pratt Frederick Rentschler Richard "Dick" Soderberg Andrew Willgoos
† Joint development aeroengines See also: Pratt & Whitney Canada aeroengines

v t e United States military piston aircraft engine designation system
H (four-bank H-configuration inline)	H-1640 XH-2240 XH-2470 XH-2600 XH-3130 XH-3730 H-4070
IV (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-1150 V-1237 V-1400 V-1440 V-1460 V-1510 V-1560 V-1570 V-1650 (P) V-1710 V-1950 V-3420
V (inverted-V inline)	V-770 V-1650 (L)
VG (inverted-V inline)	VG-1410
W (three-bank W-configuration inline)	W-2779
See also: X-1800 US military gas turbine aeroengines Piston engine configurations