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Sikorsky R-4 Utility Helicopter (United States)


The Sikorsky R-4 became the first widely-produced helicopter in aviation history, seeing 131 units in all.



 Entry last updated on 5/11/2016; Authored by Staff Writer; Content ¬©www.MilitaryFactory.com

  Sikorsky R-4  
Picture of Sikorsky R-4 Utility Helicopter (United States)
Picture of Sikorsky R-4 Utility Helicopter (United States)








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Sikorsky R-4 Specifications



Service Year: 1942
Type: Utility Helicopter
National Origin: United States
Manufacturer(s): Sikorsky - USA
Total Production: 131


Structural (Crew, Dimensions, Weights)



Operating Crew (Typical): 1
Overall Length: 33.46 feet (10.2 meters)
Overall Width: 37.73 feet (11.50 meters)
Overall Height: 12.47 feet (3.80 meters)

Weight (Empty): 2,094 lb (950 kg)
Weight (MTOW): 2,646 lb (1,200 kg)

Power / Performance (Engine Type, Top Speed)



Engine: 1 x Warner R-550 piston engine developing 200 horsepower.

Maximum Speed: 65 knots (75 mph; 120 kph)
Service Ceiling: 7,874 feet (2,400 meters; 1.49 miles)

Armament / Mission Payload



None.

Global Operators (Customers, Users)



Canada; United Kingdom; United States

Model Variants



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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