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Pratt & Whitney R-1535 Twin Wasp Junior

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1930s American aircraft engine

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R-1535 Twin Wasp Junior
Pratt & Whitney Twin Wasp Junior, at theNational Museum of Naval Aviation, Pensacola, Florida
Type	Radial engine
National origin	United States
Manufacturer	Pratt & Whitney
First run	1932
Major applications	Bristol Bolingbroke Curtiss SBC-3 Helldiver Hughes H-1 Racer Vought SB2U Vindicator
Developed from	Pratt & Whitney R-985 Wasp Junior

ThePratt & Whitney R-1535 Twin Wasp Junior is an American aircraft engine developed in the 1930s. The engine was introduced in 1932 as a 14-cylinder version of the 9-cylinderR-985, and was a two-row, air-cooled radial design.Displacement was 1,535 cu in (25.2 L);bore and stroke were both5+3⁄16 in (132 mm).^[1]

Variants

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R-1535-11 - 750 hp (560 kW)
R-1535-13 - 750 hp (560 kW), 825 hp (615 kW)
R-1535-44 - 625 hp (466 kW)
R-1535-72 - 650 hp (480 kW)
R-1535-94 - 825 hp (615 kW)
R-1535-96 - 825 hp (615 kW)
R-1535-98 - 700 hp (520 kW)
R-1535-SB4-G - 825 hp (615 kW)

Applications

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Bellanca 28-70
Boeing XF6B
Breguet 695
Bristol Fairchild Bolingbroke (Canadian licence-built version of the Blenheim)
Canadian Car and Foundry FDB-1
Consolidated XB2Y
Curtiss SBC-3 Helldiver
Douglas O-46
Fokker G.I (G.I The Wasp)
Fokker D.XXI (Finnish licence-built series 4 and 5)
Great Lakes BG
Grumman F2F
Grumman F3F-1
Grumman XJF-1 Duck (prototype only)
Grumman XSBF
Grumman XSF-2
Hughes H-1 Racer
Miles Master
Northrop A-17
Northrop BT
Northrop XFT-2
Vought SBU Corsair
Vought SB2U Vindicator
Vought V-141
Vought XF3U
Vought XO4U-2

Engines on display

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There is a R-1535-96 on display at theNew England Air Museum,Bradley International Airport, Windsor Locks, CT.^[2]
There is an R-1535 on display at theSan Diego Air and Space Museum. It is now being installed in the museum'sHughes H-1 Racer reproduction project.^{[citation needed]}

Specifications (R-1535-SB4-G)

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Data from^[3]

General characteristics

Type: Fourteen-cylinder two-row supercharged air-cooledradial engine
Bore:5+3⁄16 in (131.8 mm)
Stroke:5+3⁄16 in (131.8 mm)
Displacement: 1,534.9 cu in (25.153 L)
Length: 53.27 in (1,353 mm)
Diameter: 44.13 in (1,121 mm)
Dry weight: 1,087 lb (493 kg)

Components

Valvetrain: Twooverhead valves per cylinder
Supercharger: Single-speedcentrifugal type supercharger, 11:1 step-up
Fuel system: Two-barrelStromberg carburetor
Fuel type: 87octane rating gasoline
Cooling system: Air-cooled
Reduction gear:Epicyclic gearing, 0.75:1

Performance

Power output: 825 hp (615 kW) at 2,625 rpm for takeoff
Specific power: 0.54 hp/cu in (24.57 kW/L)
Compression ratio: 6.75:1
Specific fuel consumption: 0.49 lb/(hp•h) (295 g/(kW•h))
Oil consumption: 0.39 oz/(hp•h) (15 g/(kW•h))
Power-to-weight ratio: 0.76 hp/lb (1.25 kW/kg)

References

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Notes

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^"P&W Twin Wasp Junior(R-1535)".www.enginehistory.org. Retrieved2024-09-23.
^"Pratt & Whitney R-1535-96 Twin Wasp Junior"
^Tsygulev (1939).Aviacionnye motory voennykh vozdushnykh sil inostrannykh gosudarstv (Авиационные моторы военных воздушных сил иностранных государств) (in Russian).Moscow: Gosudarstvennoe voennoe izdatelstvo Narkomata Oborony Soyuza SSR.

Bibliography

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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

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Wikimedia Commons has media related toPratt & Whitney R-1535.

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 PW7000 PW9000 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 XLR-129
Aeroderivative gas turbine engines	FT3 FT4 FT8 FT9 FT12
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 enginedesignation 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