---- R-4 Hoverfly in service ---- UK - Fleet Air Arm - R-4 Hoverfly --- Other Model --- ---- Select sikorsky Model ---- AH-60L CH-124 Sea King CH-126 Choctaw CH-148 Cyclone CH-34C Choctaw CH-3B CH-3C CH-3E CH-53A Sea Stallion CH-53C CH-53D Sea Stallion CH-53E Super Stallion CH-53K King Stallion CH-54A Tarhe CH-54B Tarhe Commercial S-70 EH-60A QuickFix Fire King H-19A Chickasaw H-19B Chickasaw H-19C Chickasaw H-19D Chickasaw H-19D-3 H-19D-4 H-34A Choctaw H-34G III H-34G.I H-34G.II H-37A Mojave H-60 Unmanned HH-34F Seahorse HH-34J Choctaw HH-3A Big Mother HH-3E Jolly Green Giant HH-3F Pelican HH-52A Sea Guard HH-53B HH-53C HH-53H HH-60G Pave Hawk HH-60H Rescue Hawk HH-60J Jayhawk HH-60M Black Hawk HH-60W CRH-60 HNS-1 HO4S-1 HO4S-2 HO4S-3 HO4S-3G HO5S-1 HO5S-1G HR2S-1 HR2S-1W HRS-1 HRS-2 HRS-3 HRS-3Z HSS-1 / SH-34G Seabat HSS-1F / SH-34H HSS-1N / SH-34J Seabat HSS-2 Sea King HUS-1 / UH-34D Seahorse HUS-1A / UH-34E HUS-1L / LH-34D HUS-1Z / VH-34D Seahorse JUH-60A MH-53E Sea Dragon MH-53J MH-53M Pave Low IV MH-60G Pave Hawk MH-60K Black Hawk MH-60L Black Hawk MH-60M Black Hawk MH-60R Seahawk MH-60S Seahawk MH-60T Jayhawk NH-3A R-4 Hoverfly R-6 RAH-66 Comanche RH-3A Sea King RH-53A RH-53D s-51 / R-5 / H-5 s-52 H-18 HO5S S-52-1 S-52-2 S-52-3 S-53 XHJS S-55 s-55 H-19 S-55A S-55B S-55C S-55T s-56 H-37 s-58 H-34 S-58B S-58C S-58D S-58T s-59 XH-39 s-60 s-61 H-3 S-61A S-61A-1 S-61A-4 S-61A-5 S-61B S-61D-1 S-61D-2 S-61D-3 S-61D-4 S-61L S-61N S-61N Mk.II S-61R S-61T Triton S-61V s-62 HH-52 S-62A S-62B s-64 CH-54 S-64A S-64E s-65 H-53 S-65-40 S-65C-1 S-65C-2 S-65C-3 s-69 XH-59 s-70 H-60 S-70A Firehawk S-70A-1 Desert Hawk S-70A-11 Black Hawk S-70A-14 S-70A-17 Yarasa S-70A-18 Black Hawk S-70A-19 Black Hawk S-70A-21 Black Hawk S-70A-24 Black Hawk S-70A-26 Black Hawk S-70A-27 Black Hawk S-70A-28 Yarasa S-70A-30 Black Hawk S-70A-32 S-70A-33 S-70A-34 Black Hawk S-70A-36 Black Hawk S-70A-39 Black Hawk S-70A-41 Black Hawk S-70A-42 Black Hawk S-70A-43 Black Hawk S-70A-50 Black Hawk S-70A-55 Black Hawk S-70A-9 Black Hawk S-70B S-70B-1 Seahawk S-70B-2 Seahawk S-70B-28 Seahawk S-70B-6 Aegean Hawk S-70B-7 Seahawk S-70C S-70i Black Hawk s-76 S-76A S-76B S-76C S-76D s-80 H-53E S-80M-1 s-92 Helibus S-92A S-92A VVIP S-92F s-97 Raider SB-1 Defiant SH-3A Sea King SH-3D Sea King SH-3G Sea King SH-3H Sea King SH-60B Seahawk SH-60F Oceanhawk TH-53A UH-34G Seabat UH-3H Sea King UH-60A Black Hawk UH-60L Black Hawk UH-60M Black Hawk UH-60V Black Hawk VH-34A/C Choctaw VH-3A Sea King VH-3D Sea King VH-53D VH-60N Whitehawk VH-92A Whirlwind HAR.21 Whirlwind HAS.22 X2 XHR2S-1 XHSS-1 YCH-53A YCH-53E YCH-54A YH-18 YH-19 --- Other Models ---
The R-4 was the US military designation of the VS-316A, essentially an improved VS-300 with a fully enclosed, fabric-covered structure (the last metre or so of the tail skeleton was left uncovered), slightly larger main rotor diameter, improved engine and without the small, nose-mounted stabilising wheel.
Following promising performance by a prototype, United Aircraft (Vought-Sikorsky Division) accepted a contract in 1941 to develop it further into a twin seater. On 14 Jan 1942, the first (XR-4) Hoverfly was flown. After a historic flight of over 750 miles (in several stages between 13 and 17 May) and acceptance in May 1942, the US ordered 30 machines (YR-4) in 1943.