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Sikorsky R-4 Utility Helicopter


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

 Updated: 5/11/2016; Authored By Staff Writer; Content ¬©www.MilitaryFactory.com

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Sikorsky R-4 Technical Specifications



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


Structural (Crew Space, Dimensions and 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)

Installed Power and Standard Day Performance



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

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

Armament / Mission Payload



None.

Global Operators / Customers



Canada; United Kingdom; United States

Model Variants (Including Prototypes)



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.