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Sikorsky R-4


Utility Helicopter


United States | 1942



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

Power & Performance
Those special qualities that separate one aircraft design from another. Performance specifications presented assume optimal operating conditions for the Sikorsky R-4 Utility Helicopter.
1 x Warner R-550 piston engine developing 200 horsepower.
Propulsion
75 mph
120 kph | 65 kts
Max Speed
7,874 ft
2,400 m | 1 miles
Service Ceiling
Structure
The nose-to-tail, wingtip-to-wingtip physical qualities of the Sikorsky R-4 Utility Helicopter.
1
(MANNED)
Crew
33.5 ft
10.20 m
O/A Length
37.7 ft
(11.50 m)
O/A Width
12.5 ft
(3.80 m)
O/A Height
2,094 lb
(950 kg)
Empty Weight
2,646 lb
(1,200 kg)
MTOW
Variants
Notable series variants as part of the Sikorsky R-4 family line.
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.
Operators
Global customers who have evaluated and/or operated the Sikorsky R-4. Nations are displayed by flag, each linked to their respective national aircraft listing.

Total Production: 131 Units

Contractor(s): Sikorsky - USA
National flag of Canada National flag of the United Kingdom National flag of the United States

[ Canada; United Kingdom; United States ]
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Image of the Sikorsky R-4
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Image of the Sikorsky R-4
Image copyright www.MilitaryFactory.com; No Reproduction Permitted.

Going Further...
The Sikorsky R-4 Utility Helicopter appears in the following collections:
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