:lol: Sir, Thanks a lot, sir !
Sir, can i add my opinion, sir ?
Helicopters are next mine passion and i would offer some correction about R6A as first military chopper.
So, Sicorsky made according contract with USA AF first R-4 Howerfly in december 1941.
By USA tradition first experimental variants was named as XR-4 (VS-316 (Voght-Sikorsky) or S-47 (!?) - internal names).
First examples got radial 7 cyl/165 Hp Warner R500-3 Super Scarab engine.
In january 1942 XR-4 firstly taked off. XR-4 achieved 130km/h and 600 m. After that army men got interest for such helicopter and in 20 april 1942 XR-4 was showed first time for army comission. They offered test R-4 in Wright Hill in Dayton. R-4 got ride from Brigeport to Dayton (about 1200 km) by air, with 16 stops
In 30 may 1942 (!) army after series of tests adopted R-4 officially.
In december 1942 Sikorsky subscribed contracts with USA AF and Coastal Guard for delivery 22 R-4 helycopters (all helicopters was purposed for testing and training).
During army’s tests Sikorsky modernised a bit R-4A to R-4C, helicopter got new Warner R550-1 180Hp engeene, with at 0.8 meter larger rotor and with large fuel tank.
Sikorsky made modification R-4C - YR4B (YR instead R meand something like non-serial) , that chopper can take onboard 2 x 45.5 or 1x 147 kg bomb…
In 1943 2 R-4A and 5 YR-4B was send in England, US Coastal Guard got 6 YR-4B.
After set of new tests USA and GB military ordered in January 1943 to Sikorsky 200 R-4B, but only 100 was built till end of WWII.
13 got US CG, 4 - US Navy, 38 US AF, 45 got Grat Britan and Canada (6 R-4B was formed in King’s Squad, they serve for GB King’s family).
In 03 january 1944 near New York US Navy ship “Turner” exploded. Many injured strongly needed blood plasma, but weather make airplanes useless. R-4B taked off from Floyd Beneth CG Base near Brooklin, loaded with blood plasma in hospital and after 14 minutes landed near “Turner”.
It was a first rescue operation in the World with helicopters usage…
R-4 tecnical data:
Rotor diameter: 38 ft.
Length: 33 ft. 7 3/4 in.
Height: 12 ft. 5 in.
Weight: 2,581 lbs. loaded
PERFORMANCE
Maximum speed: 75 mph.
Cruising speed: 65 mph.
Range: 230 miles
Service Ceiling: 8,000 ft.
According USAF site:
http://www.wpafb.af.mil/museum/air_power/ap23.htm
"The R-4 was first used in combat in May 1944. In a letter to a friend, Col. Philip G. Cochran, Commanding Officer (CO) of the 1st Air Commando Group, wrote “Today the ‘egg-beater’ went into action and the damn thing acted like it had good sense.”
First R-6 taked off in 15 october 1943 (this hely was a really modernised R-4, more powerfull and with real cockpit)
In 1944 US AF ordered some quantity of R-6, but Sikorsky United Aircrafts Co. wasn’t able to produce more helicopters (the already was in producing R-4 and R5). And finally n october 1944 Nash Kelvinator under Sikorsky license started make R-6.
Nash Kelvinator - famous refrigerators producer, but with helicopters, they have problems with quality. By this problems firts R-6 in US AF nicknamed “Kelvicopter” or “Cooler”. Totally 219 R-6 was produced in 1944-1945 by Nash-Kelvinator…
“Although primarily an observation and liaison helicopter, many R-6As also were equipped with capsules on each side of the fuselage to carry litters for medical evacuation. Bomb racks also could be installed and, if necessary, the R-6A could be equipped with floats for operation from water.”
http://www.wpafb.af.mil/museum/air_power/ap30.htm
SPECIFICATIONS
Main rotor diamater: 38 ft.
Length: 38 ft. 3 in.
Height: 11 ft. 7 in.
Weight: 2,900 lbs. max.
Engine: One Franklin O-405-9 of 235 hp.
PERFORMANCE
Maximum speed: 96 mph.
Cruising speed: 69 mph.
Range: 305 miles
Service ceiling: 13,200 ft.
It is mine opinion about what helicopter was first in combat use.
And about XM-8… something went wrong with it, i feel. After series of loud advertisings HK no more show XM-8 on they’s site… but there appear HK 416 assault rifle, pretty damn looks like modified Colt M-4.
And a lot gossips around it - all intrigued but nobady hawe seen it in reality… Someone sayd it hawe piston-based gas automatic, as if HK just put piston in gas-tube and make M-4 same with M18, someone talk about rollers in automatic, just like in G3… but receiver looks same with M-4…
Anybody, who hawe deals with CAR-15 tought once - that gun need gas piston instead of direct gas operated automatic, maybe HK done it finally ?
All sems as if HK treing make alternative programm - M-4 wold be not replaced but would be upgraded ? I gust guessing…
So, i typed enough… and i my opinions are discutable, i’m not an american, just trieng to be… and i can only argue about USA history and present by books and Internet information.