Pratt & Whitney R-1535 Twin Wasp Junior

R-1535 Twin Wasp Junior

Pratt & Whitney Twin Wasp Junior, at the National Museum of Naval Aviation, Pensacola, Florida
Type	Radial engine
National origin	United States
Manufacturer	Pratt & Whitney
First run	1932

The Pratt & Whitney R-1535 Twin Wasp Junior was an engine used in American aircraft in the 1930s. The engine was first introduced in 1932 as a 14-cylinder version of the 9-cylinder R-985.^[1] It was a two-row, air-cooled radial design. Displacement was 1,535 in³ (25.2 L); bore and stroke were both 5-3/16 in (131.8 mm).

Variants

R-1535-11 - 750 hp (559 kW)
R-1535-13 - 750 hp (559 kW), 825 hp (615 kW)
R-1535-44 - 625 hp (466 kW)
R-1535-72 - 650 hp (485 kW)
R-1535-94 - 825 hp (615 kW)
R-1535-96 - 825 hp (615 kW)
R-1535-98 - 700 hp (521 kW)
R-1535-SB4-G - 825 hp (615 kW)

Applications

Bellanca 28-70
Breguet 695
Curtiss SBC-3 Helldiver
Douglas O-46
Fokker D.XXI (Finnish licence-built series 4 and 5)
Grumman F2F
Hughes H-1 Racer
Miles Master
Northrop A-17
Northrop BT
Vought SBU Corsair
Vought SB2U Vindicator

Engines on display

There is a R-1535-96 on display at the New England Air Museum, Bradley International Airport, Windsor Locks, CT.^[2]
There is an R-1535 on display at the San Diego Air and Space Museum.

Specifications (R-1535-SB4-G)

Data from ^[3]

General characteristics

Type: Fourteen-cylinder two-row supercharged air-cooled radial engine
Bore: 5 ³⁄₁₆ in (131.8 mm)
Stroke: 5 ³⁄₁₆ in (131.8 mm)
Displacement: 1,534.9 in³ (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: Two overhead valves per cylinder
Supercharger: Single-speed centrifugal type supercharger, 11:1 reduction
Fuel system: Two-barrel Stromberg carburetor
Fuel type: 87 octane 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/in³ (24.45 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

Notes

↑ Gunston 1989, p.115.
↑ "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

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

External links

Wikimedia Commons has media related to Pratt & Whitney R-1535.

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 JT4 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 STF200 SuperFan† V2500† F100 F105 F117 F119 F135 F401 TF30 TF33 RM8

Turboprops/Turboshafts	APW34† JFTD12 PT2 PT3 PT4 PT5 T34 XT45 T52 XT57 T73 T800-APW†

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

United States military piston aircraft engine designation system

H (four-bank H-configuration inline)	H-1640 XH-2240 H-2470 XH-2600 XH-3130 XH-3730 H-4070

I (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-770 V-1150 V-1237 V-1400 V-1410 V-1440 V-1460 V-1510 V-1560 V-1570 V-1650 (L) V-1650 (P) V-1710 V-1950 V-3420

W (three-bank W-configuration inline)	W-2779

See also: X-1800 US military gas turbine aeroengines Piston engine configurations

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