Sikorsky Aircraft S-47 / R-4 / Hoverfly 1

Observation / Liaison / Rescue Helicopter

Sikorsky S-47 / R-4B Hoverfly Mk.1 Royal Air Force KK995 © Karsten Palt
Photo ©: Karsten Palt
The Sikorsky S-47 is a light 2-seat single-engine military helicopter built by the American manufacturer Sikorsky Aircraft.. The S-47 was operated by the United States Army Air Forces as the Sikorsky R-4, by the US Navy and US Coast Guard as the HNS-1. S-47 in service with the Royal Air Force and Royal Navy were designated Hoverfly.
The Sikorsky S-47 was the world?s first mass production helicopter. It is a development of the experimental helicopter Vought-Sikorsky VS-300.
Propulsion1 Radial Engine
Engine ModelWarner R-550 Super Scarab
Engine Power149 kW200 hp
max. Cruise Speed104 km/h56 kts
  64 mph
Speed131 km/h71 kts
  82 mph
Service Ceiling2.438 m8.000 ft
Range370 km200 NM
230 mi.
Empty Weight916 kg2.019 lbs
max. Takeoff Weight1.150 kg2.535 lbs
Rotor Blades (main/tail)3/3
Main Rotor Diameter11,50 m37 ft 9 in
Tail Rotor Diameter2,40 m7 ft 10 in
Rotor Disc Area103,9 m1118 ft
Length (Fuselage)10,20 m33 ft 6 in
Length14,80 m48 ft 7 in
Height3,78 m12 ft 5 in
First Flight14.01.1942
Production Statusout of production
Production Range1942-1944
Total Production131
Data for (Version)Sikorsky R-4B

[Photo-ID: 5487] Karsten Palt 2012-01-11
Sikorsky R-4B Hoverfly, United States Army Air Forces (USAAF), 43-46506, c/n 43, Karsten Palt, 2012Sikorsky
R-4B Hoverfly
United States Army Air Forces (USAAF)
Reg.: 43-46506
c/n: 43
National Museum of the United States Air Force [Dayton, Ohio / USA (Wright-Patterson AFB)]
[Photo-ID: 1250] Karsten Palt 2008-07-16
Sikorsky S-47 / R-4B Hoverfly Mk.1, Royal Air Force, KK995, c/n , Karsten Palt, 2008Sikorsky
S-47 / R-4B Hoverfly Mk.1
Royal Air Force
Reg.: KK995
Composite Aircraft
Royal Air Force Museum [London-Hendon]
[Photo-ID: 10357] Karsten Palt 2014-05-28
Sikorsky XR-4C, United States Army Air Forces (USAAF), 41-18874, c/n 1, Karsten Palt, 2014Sikorsky
United States Army Air Forces (USAAF)
Reg.: 41-18874
c/n: 1
prototype, first Sikorsky R-4 built
NASM Udvar Hazy Center [Chantilly, VA]