Sikorsky Helicopters

Sikorsky R-6 Hoverfly II

Sikorsky R-4 Hoverfly

Helicopters

Sikorsky Helicopters

Helicopters

Sikorsky R-4 – ‘s Werelds eerste productiehelikopter (1940)  Sikorsky R-6 Hoverfly II

Sikorsky S-55 – Helikopter voor meerdere doeleinden (1949)  Sikorsky S-58 – verbeterde S-55 (1954)  

Sikorsky S-61 – Sikorsky CH-64 Skycrane –  CH-54 Tarhe “vliegende kraan” (1962)  

CH-53 Sea Stallion, CH-53E Super Stallion heavy lift helikopters (1964, 1974)  

Sikorsky S-70 – UH-60 Black Hawk – SH-60 Sea Hawk (1974) 
Sikorsky S-76 Spirit – 14-zits commerciële helikopter (1977)  

Sikorsky S-92 en de militaire Sikorsky H-92  Sikorsky X-2 •  Sikorsky S-97 Raider

Sikorsky Helicopters

The Sikorsky R-6 is an American light two-seat helicopter of the 1940s. In Royal Air Force and Royal Navy service, it was named the Hoverfly II.

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Sikorsky R-6 Hoverfly II

The R-6/Hoverfly II was developed to improve on the successful Sikorsky R-4. In order to enhance performance, a completely new streamlined fuselage was designed and the boom carrying the tail rotor was lengthened and straightened. The main rotor and transmission system of the R-4 were retained.[1] Sikorsky allotted their Model 49 designation to the new design. Later, dynamically-balanced modifications to the rotor were carried out by Doman Helicopters Inc. The new aircraft could attain 100 mph (160 km/h) compared with 82 mph (132 km/h) by the earlier design.

Operational History

The first R-6s were delivered to the United States Army Air Forces (USAAF) in late 1944 and some were transferred to the United States Navy (USN). It was initially intended to pass 150 R-6s to the Royal Air Force (RAF), but delays caused by the switch of production from Sikorsky’s factory at Stratford, Connecticut to Nash-Kelvinator at Detroit Michigan meant that only 27 R-6As were actually delivered to the RAF as the Hoverfly II.[2] Fifteen of these were passed on to the Royal Navy’s Fleet Air Arm (FAA).[3]

Sikorsky Helicopters

Sikorsky

RoleHelicopter
National originUnited States
ManufacturerSikorsky Aircraft
First flight15 October 1943
Introduction1945
StatusRetired
Primary usersUnited States Navy
Royal Air Force
Number built225
Developed fromSikorsky R-4

Variants

 
XR-6
prototype powered by a 225 hp (168 kW) Lycoming O-435-7 (one)
XR-6A
as XR-6 but powered by the 240 hp (180 kW) Franklin O-405-9 (five) of which three to the US Navy as XHOS-1
YR-6A
as XR-6A with small changes (26) built by Nash-Kelvinator
R-6A
production model (193) built by Nash-Kelvinator of which 36 to US Navy as HOS-1 and 27 to the RAF as Hoverfly II
R-6B
projected variant with 225 hp (168 kW) Lycoming O-435-7, but not proceeded with
XR-7
projected development of the XR-6 with a 240 hp (180 kW) Franklin O-405-9 engine, not built.
Doman LZ-1
One R-6A modified as a testbed
Doman LZ-1A
One R-6A modified as a testbed with a Doman-designed hingeless rotor blades and self-lubricating rotor hub.

Specifications (R-6 Hoverfly II)

General characteristics

  • Crew: one
  • Capacity: one observer
  • Length: 47 ft 11 in (14.61 m)
  • Gross weight: 2,600 lb (1,179 kg)
  • Powerplant: 1 × Franklin O-405-9 piston, 240 hp (180 kW)
  • Main rotor diameter: 38 ft 0 in (11.58 m)

Specifications (R-6 Hoverfly II)

Performance

Performance

  • Maximum speed: 100 mph (160 km/h, 87 kn)
  • Service ceiling: 10,000 ft (3,000 m)

Related

Aircrafttoaal encyclopedia

An air force, also known in some countries as an aerospace force or air army, is in the broadest sense, the national military branch that primarily conducts aerial warfare.