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WORLD WAR 2


Sikorsky R-4


Utility Helicopter


The Sikorsky R-4 became the first widely-produced helicopter in aviation history, seeing 131 units in all.
Authored By: Staff Writer | Edited: 5/11/2016
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Specifications


Year: 1942
Manufacturer(s): Sikorsky - USA
Production: 131
Crew: 1
Length: 33.46 ft (10.2 m)
Width: 37.73 ft (11.5 m)
Height: 12.47 ft (3.8 m)
Weight (Empty): 2,094 lb (950 kg)
Weight (MTOW): 2,646 lb (1,200 kg)
Power: 1 x Warner R-550 piston engine developing 200 horsepower.
Speed: 75 mph (120 kph; 65 kts)
Ceiling: 7,874 feet (2,400 m; 1.49 miles)
Operators: Canada; United Kingdom; United States






Armament



None.

Variants / Models



• XR-4 - Single Prototype Model; fitted with R-500-3 series engine of 165 horsepower.
• YR-4A - Developmental model with R-550-1 engine of 180 horsepower; larger-diameter rotor for improved lift; 3 examples completed.
• YR-4B - Development model for formal US Army evaluations; 27 examples produced.
• R-4B - Production Designation of R-4 series; fitted with R-550-3 series engines of 200 horsepower; 100 examples produced.
• XR-4C - Prototype model with R-550-1 engine of 180 horsepower; revised rotor.
• HNS-1 - US Navy designation of three YR-4B and twenty-two R-4B models.
• "Hoverfly I" - British military designation of R-4 production model; 52 examples delivered.
• S-54 - R-4B test platform with observer's position added.
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