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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."



Authored By: Staff Writer | Last Edited: 05/11/2016 | Content ©www.MilitaryFactory.com
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 ]
Relative Max Speed
Hi: 100mph
Lo: 50mph
Aircraft Max Listed Speed (75mph).

Graph Average of 75 MPH.
Era Crossover
Pie graph section
Showcasing Aircraft Era Crossover (if any)
Max Alt Visualization
Small airplane graphic
Production Comparison
131
36183
44000
Entry compared against Ilyushin IL-2 (military) and Cessna 172 (civilian) total production.
MACH Regime (Sonic)
Sub
Trans
Super
Hyper
HiHyper
ReEntry
RANGES (MPH) Subsonic: <614mph | Transonic: 614-921 | Supersonic: 921-3836 | Hypersonic: 3836-7673 | Hi-Hypersonic: 7673-19180 | Reentry: >19030
Aviation Timeline
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Image of the Sikorsky R-4
Image copyright www.MilitaryFactory.com; No Reproduction Permitted.

Mission Roles
Some designs are single-minded in their approach while others offer a more versatile solution to airborne requirements.
TRANSPORT
Recognition
Some designs stand the test of time while others are doomed to never advance beyond the drawing board; let history be their judge.
Going Further...
The Sikorsky R-4 Utility Helicopter appears in the following collections:
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