Pratt & Whitney R-1535

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. It was a two-row, 14-cylinder air-cooled radial design. Displacement was 1,535 cubic inches (25.2 liters); bore and stroke were 5-3/16" and 5-3/16" (131.8 mm and 131.8 mm).

Models

*R-1535: 700 hp (521 kW)
*R-1535-13: 750 hp (559 kW), 825 hp (615 kW)
*R-1535-SB4-G: 825 hp (615 kW)

pecifications (R-1535-SB4-G)

pistonspecs

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type=Fourteen-cylinder two-row supercharged air-cooled radial engine
bore=5.19 in (132 mm)
stroke=5.19 in (132 mm)
displacement=1,535 in³ (25.15 l)
length=53.27 in (1,353 mm)
diameter=44.13 in (1,121 mm)
width=
height=
weight=1,087 lb (493 kg)
valvetrain=Two overhead valves per cylinder
supercharger=Single-speed centrifugal type supercharger, 11:1 reduction
turbocharger=
fuelsystem=Two-barrel Stromberg carburetor
fueltype=87 octane rating gasoline
oilsystem=
coolingsystem=Air-cooled
power=825 hp (615 kW) at 2,625 rpm for takeoff
specpower=0.54 hp/in³ (24.45 kW/l)
compression=6.75:1
fuelcon=
specfuelcon=0.49 lb/(hp•h) (295 g/(kW•h))
oilcon=0.39 oz/(hp•h) (15 g/(kW•h))
power/weight=0.76 hp/lb (1.25 kW/kg)
designer=
reduction_gear=Epicyclic gearing, 0.75:1

Aircraft which used R-1535

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

Related contents

* Pratt & Whitney Wasp series
* R-1340 Wasp
* R-985 Wasp Junior
* R-1830 Twin Wasp
* R-2800 Double Wasp
* R-4360 Wasp Major

References

External links

* http://www.pratt-whitney.com/pratt/web/index1588.html
* http://www.shanaberger.com/engines/R-1535.htm