R-4

E255420

The R-4 is a World War II–era Sikorsky helicopter recognized as the first mass-produced helicopter and the first to be used operationally by the U.S. military.

All labels observed (1)

Label Occurrences
R-4 canonical 1

How this entity was disambiguated

Statements (49)

Predicate Object
instanceOf helicopter
military helicopter
alsoKnownAs Sikorsky HNS-1
Sikorsky Hoverfly
Sikorsky R-4
conflict World War II
countryOfOrigin United States of America
surface form: United States
crew 2
cruiseSpeed 65 mph
designer Igor Sikorsky
developedFrom VS-300
engineModel Warner R-550-1 Super Scarab
enginePower 200 hp
engineType piston engine
firstFlight 1942-01-13
fuselageMaterial steel-tube frame with fabric covering
introduced 1942
landingGear fixed landing gear with wheels
mainRotorBlades 3
manufacturer Sikorsky Aircraft (until divestiture)
surface form: Sikorsky Aircraft
maximumSpeed 75 mph
natoReportingName none
notableFor first helicopter used operationally by the U.S. military
first mass-produced helicopter
numberBuilt 131
operator Royal Air Force
Royal Canadian Air Force
Royal Navy
United States Army Air Forces
United States Coast Guard
United States Navy
primaryRole liaison helicopter
observation helicopter
rescue helicopter
productionEnd 1944
productionStart 1942
range 130 mi
rotorConfiguration single main rotor with tail rotor
serviceCeiling 8000 ft
usedBy Royal Air Force
Royal Canadian Air Force
Royal Navy
United States Army Air Forces
United States Coast Guard
United States Navy
usedFor air-sea rescue missions
artillery spotting
medical evacuation
transport of light cargo

How these facts were elicited

Referenced by (1)

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

Sikorsky Aircraft (until divestiture) notableProduct R-4
subject surface form: Sikorsky Aircraft