Military Factory logo
Icon of F-15 Eagle military combat fighter aircraft
Icon of Abrams Main Battle Tank
Icon of navy warships
Icon of AK-47 assault rifle

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
National Flag Graphic


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



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.
Site Disclaimer  |  Privacy Policy  |  Cookies  |  Site Map Site content ©2003-, All Rights Reserved.

The "Military Factory" name and logo are registered ® U.S. trademarks protected by all applicable domestic and international intellectual property laws. All written content, illustrations, and photography are unique to this website (unless where indicated) and not for reuse/reproduction in any form. Material presented throughout this website is for historical and entertainment value only and should not to be construed as usable for hardware restoration, maintenance, or general operation. We do not sell any of the items showcased on this site. Please direct all other inquiries to militaryfactory AT

Part of a network of sites that includes, GlobalFirepower, a data-driven property used in ranking the top military powers of the world, and, the World Directory of Modern Military Aircraft.

Facebook Logo YouTube Logo