Pratt & Whitney R-1535 Twin Wasp Junior radial engine

E926490

The Pratt & Whitney R-1535 Twin Wasp Junior is a 14-cylinder, air-cooled radial aircraft engine developed in the 1930s, widely used in high-performance racing and military aircraft of its era.

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Statements (44)

Predicate Object
instanceOf aircraft piston engine
air‑cooled engine
radial engine
applicationRole high‑performance racing
military service
boreStrokeConfiguration two‑row 14‑cylinder radial layout
configuration radial
coolingSystem air‑cooled
countryOfOrigin United States of America
surface form: United States
cycle four‑stroke
cylinderArrangement two‑row radial
cylinderCount 14
designation R‑1535 NERFINISHED
designedFor medium‑power aircraft applications
displacement 1535 cubic inches
approximately 25.2 liters
era 1930s
family Pratt & Whitney Twin Wasp Junior family NERFINISHED
Pratt & Whitney Wasp series NERFINISHED
firstRun early 1930s
fuelType aviation gasoline
ignitionSystem dual ignition
manufacturer Pratt & Whitney NERFINISHED
materialUse aluminum alloy components
steel components
nickname Twin Wasp Junior NERFINISHED
notableCharacteristic compact two‑row radial design
reliable operation in military service
widely used in 1930s racing aircraft
primaryUsePeriod 1930s
early 1940s
propellerDrive direct drive
successorInFamily Pratt & Whitney R‑1830 Twin Wasp NERFINISHED
supercharging single‑stage supercharger
typicalCompressionRatio around 6:1 to 6.7:1
typicalMounting nose‑mounted on aircraft
typicalPowerOutput approximately 700 horsepower
usedBy United States military NERFINISHED
foreign military operators
usedIn military aircraft
racing aircraft
transport aircraft
usedInConflict World War II
valveTrain overhead valve

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Hughes H-1 Racer powerplant Pratt & Whitney R-1535 Twin Wasp Junior radial engine