Sikorsky R-4

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The Sikorsky R-4 was the world’s first mass-produced helicopter and the first helicopter to be used operationally by the U.S. military during World War II.

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Statements (48)

Predicate Object
instanceOf helicopter
military helicopter
capacity 1 passenger
countryOfOrigin United States of America
surface form: United States
crew 2
cruiseSpeed 97 km/h
designer Igor Sikorsky NERFINISHED
developedFrom Sikorsky VS-300 NERFINISHED
emptyWeight 1134 kg
engineModel Warner R-550-1 Super Scarab NERFINISHED
enginePower 200 hp
engineType piston engine
era 1940s
firstFlight 1942-01-13
firstOperationalUse 1944
fuselageCovering fabric-covered
fuselageMaterial steel tube structure
grossWeight 1452 kg
height 3.0 m
introduced 1942
landingGearType fixed landing gear
length 10.4 m
mainRotorConfiguration single main rotor
mainRotorDiameter 11.6 m
manufacturer Sikorsky Aircraft NERFINISHED
maximumSpeed 120 km/h
militaryDesignation R-4 NERFINISHED
navalDesignation HNS-1 NERFINISHED
notableFor first helicopter used operationally by the U.S. military
first mass-produced helicopter
numberBuilt 131
primaryUser Royal Air Force
Royal Navy NERFINISHED
United States Army Air Forces NERFINISHED
United States Navy NERFINISHED
RAFDesignation Hoverfly I NERFINISHED
range 210 km
role liaison helicopter
rescue helicopter
training helicopter
rotorBladesNumber 3
serviceCeiling 2400 m
status retired
tailRotor yes
usedFor observation
pilot training
search and rescue missions
usedInConflict World War II

Referenced by (2)

Full triples — surface form annotated when it differs from this entity's canonical label.

R-4 alsoKnownAs Sikorsky R-4
Igor Sikorsky notableWork Sikorsky R-4