Pratt & Whitney R-985

The Pratt & Whitney R-985 Wasp Junior was a radial engine widely used in American aircraft starting in the 1930s. It was a scaled-down version of the original R-1340, and the second in the Wasp family. It was a single-row, 9-cylinder air-cooled radial design. Displacement was 985 cubic inches (16.1 liters); bore and stroke were each 5³⁄₁₆ in (132 mm).

It was used on numerous light aircraft and has a good reputation for being dependable. Most versions produced 450 hp.

pecifications (R-985-TB)

pistonspecs

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type=Nine-cylinder single-row supercharged air-cooled radial engine
bore=5.2 in (132 mm)
stroke=5.2 in (132 mm)
displacement=985 in³ (16.14 l)
length=41.61 in (1,057 mm)
diameter=45.75 in (1,162 mm)
width=
height=
weight=611 lb (277 kg)
valvetrain=Two overhead valves per cylinder
supercharger=Single-speed General Electric centrifugal type supercharger, 8:1 reduction
turbocharger=
fuelsystem=Two-barrel Stromberg carburetor
fueltype=80 octane rating gasoline
oilsystem=
coolingsystem=Air-cooled
power=440 hp (328 kW) at 2,300 rpm for takeoff
specpower=0.45 hp/in³ (20.32 kW/l)
compression=6.0:1
fuelcon=
specfuelcon=0.49 lb/(hp•h) (295 g/(kW•h))
oilcon=0.39 oz/(hp•h) (15 g/(kW•h))
power/weight=0.72 hp/lb (1.18 kW/kg)
reduction_gear=

Related contents

* Pratt & Whitney Wasp series
* R-1340 Wasp
* R-1830 Twin Wasp
* R-1535 Twin Wasp Junior
* R-2800 Double Wasp
* R-4360 Wasp Major

Applications

;USA:
*Airspeed Oxford GBR
*Air Tractor AT-300
*Avro Anson
*Barkley-Grow T8P-1
*Beechcraft Staggerwing
*Beech Model 18
*Bellanca CH-300
*Berliner-Joyce OJ-2
*Bratukhin G-3
*De Havilland Canada DHC-2 Beaver
*Grumman Goose
*Howard DGA-11
*Howard DGA-15
*Lockheed Electra
*Lockheed Model 12 Electra Junior
*PWS-24
*Sikorsky R-5
*Spartan Executive
*Vought Kingfisher
*Vultee BT-13 Valiant
*AgCat Models A, B, & Original Light Frame

References

External links

*http://www.pw.utc.com/vgn-ext-templating/v/index.jsp?vgnextoid=2c0df3b8f77fb010VgnVCM1000000881000aRCRD
*http://www.hill.af.mil/museum/photos/wwii/r985.htm