Sikorsky R-4 (Sikorsky HNS-1, Hoverfly)

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https://en.wikipedia.org/wiki/Sikorsky_R-4
https://de.wikipedia.org/wiki/Sikorsky_R-4
https://ru.wikipedia.org/wiki/Sikorsky_R-4
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Sikorsky Aircraft - Hubschrauber der Sikorsky Aircraft Corporation - Авиатехника Sikorsky https://en.wikipedia.org/wiki/Template:Sikorsky_Aircraft, https://de.wikipedia.org/wiki/Vorlage:Navigationsleiste_Sikorsky, https://ru.wikipedia.org/wiki/Шаблон:Авиатехника_Sikorsky
United States helicopter designations, Army/Air Force and Tri-Service systems - Hubschrauber der US-Streitkräfte https://en.wikipedia.org/wiki/Template:US_helicopters
USN helicopter designations pre-1962 https://en.wikipedia.org/wiki/Template:USN_helicopters
Vought, Vought-Sikorsky, and LTV Aerospace aircraft - Flugzeuge und Lenkwaffen des Herstellers Vought - Самолёты Vought/LTV Aerospace https://en.wikipedia.org/wiki/Template:Vought_aircraft, https://de.wikipedia.org/wiki/Vorlage:Navigationsleiste_Vought, https://ru.wikipedia.org/wiki/Шаблон:Самолёты_Vought
USN/USMC trainer aircraft designations - Schulflugzeuge der U.S. Navy und des U.S. Marine Corps https://en.wikipedia.org/wiki/Template:USN_trainer_aircraft, Schulflugzeuge der U.S. Navy und des U.S. Marine Corps von 1922 bis 1948
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Sikorsky Aircraft - Hubschrauber der Sikorsky Aircraft Corporation - Авиатехника Sikorsky
Sikorsky Aircraft
Fixed-wing aircraft S-1 • S-2 • S-3 • S-4 • S-5 • S-6 • S-7 • S-8 • S-9 • S-10 • S-11 • S-12 • S-13 • S-14 • S-15 • S-16 • S-17 • S-18 • S-19 • S-20 • S-21 • S-22 • S-23 • S-24 • S-25 • S-26 • S-27 • S-28 • S-29-A • S-30 • S-31 • S-32 • S-33 • S-34 • S-35 • S-36 • S-37 • S-38 • S-39 • S-40 • S-41 • S-42 • S-43 • VS-44 • S-45
Helicopters
(Company designations)		 VS-300 (S-46) • S-47 • S-48 • S-49 • S-51 • S-52 • S-53 • S-54 • S-55 • S-56 • S-57 • S-58 • S-59 • S-60 • S-61 • S-61L/N • S-61R • S-62 • S-63 • S-64 • S-65 • S-66 • S-67 • S-68 • S-69 • S-70 • S-71 • S-72 • S-73 • S-74 • S-75 • S-76 • S-80 • S-92/H-92 • S-97 • S-300 • S-333 • S-434
Helicopters
(Military designations)		 SH-3 • HH-3E/F • R-4 • H-5 • H-6 • H-18 • H-19 • H-34 • CH-37 • XH-39 • HH-52A • CH-53 • CH-53E • CH-53K • CH-54 • HH-60G • HH-60J • MH-60R/S • SH-60B/F • SH-60J/K • UH-60 • VH-60 • RAH-66 • CH-124 • CH-148
Experimental aircraft Cypher • Cypher II • Firefly • X2 • XBLR-3 • XV-2
United States helicopter designations, Army/Air Force and Tri-Service systems - Hubschrauber der US-Streitkräfte
United States helicopter designations, Army/Air Force and Tri-Service systems
Numerical sequence used by USAAC/USAAF/USAF 1941-present; US Army 1948-1956 and 1962-present; US Navy 1962-present
Main sequence
(1941-1962) 		Prefix R-, 1941-1948 R-1 • R-2 • R-3 • R-4 • R-5 • R-6 • R-7 • R-8 • R-9 • R-10 • R-11 • R-12 • R-13 • R-14 • R-15 • R-16
Prefix H-, 1948-1962 H-5 • H-6 • H-9 • H-10 • H-11 • H-12 • H-13/J • H-15 • H-16 • H-17 • H-18 • H-19 • H-20 • H-21 • H-22 • H-23 • H-24 • H-25 • H-26 • H-27 • H-28 • H-29 • H-30 • H-31 • H-32 • H-33 • H-34 • H-35 • H-361 • H-37 • H-381 • H-39 • H-40 • H-41 • H-42 • H-43 • H-441 • H-451
Main joint sequence
(1962-present) 		1962 redesignations OH-13/UH-13J • UH-19 • CH-21 • OH-23 • UH-25 • CH-34 • CH-37 • HH-43
New designations CH-46/HH-46/UH-46 • CH-47 • UH-48 • XH-49 • QH-50 • XH-51 • HH-52 • CH-53/HH-53/MH-53/CH-53E/CH-53K • CH-54 • TH-55 • AH-56 • TH-57 • OH-58 • XH-59 • UH-60/SH-60/HH-60/HH-60J • YUH-61 • XCH-62 • YAH-63 • AH-64 • HH-65 • RAH-66 • TH-67 • MH-68 • H-691 • ARH-70 • VH-71 • UH-72
1962 redesignations
reusing old numbers		 UH-1/N/Y • AH-1/J/T/W/Z • SH-2/SH-2G • SH-3/CH-3/HH-3 • OH-4 • OH-5 • OH-6/MH-6/AH-6
USN helicopter designations pre-1962
USN helicopter designations pre-1962
Helicopter, Anti-submarine Bell HSL
Sikorsky HSS-1 • HSS-2
Helicopter, Crane McDonnell HCH
Helicopter, Observation Convertawings HOC
Hiller HOE
Gyrodyne HOG
Kaman HOK
Sikorsky HOS • HO2S • HO3S • HO4S • HO5S
Helicopter, Trainer pre-1948 Sikorsky HNS
Helicopter, Trainer 1948-1962 Hiller HTE
Kaman HTK
Bell HTL
Helicopter, Transport 1944-1962 Boeing Vertol HRB
McDonnell HRH
Piasecki HRP
Sikorsky HRS • HR2S • HR3S
Helicopter, Utility pre-1949 McDonnell HJD • HJH
Piasecki HJP
Sikorsky HJS
Helicopter, Utility 1950-1962 Kaman HUK • HU2K
Bell HUL
McCulloch HUM
Piasecki HUP
Sikorsky HUS • HU2S
USN/USMC trainer aircraft designations - Schulflugzeuge der U.S. Navy und des U.S. Marine Corps
USN/USMC trainer aircraft designations
N-series
(1922-1948) 		Boeing NB • N2B
Curtiss NC1 • N2C
Piper NE
Huff-Daland HN
Howard NH
North American NJ
Keystone NK
Langley NL
Martin NM1 • N2M
Naval Aircraft Factory NN1 • N2N • N3N • N4N1 • XN5N
Spartan NP
Fairchild NQ
Ryan NR
Stearman NS • N2S
New Standard NT
Timm NT2 • N2T
Consolidated NY • N2Y • N3Y • N4Y
T-series
(1948-1962) 		Edo TE
Grumman TF
North American TJ • T2J • T3J
Lockheed TO
Temco TT
Lockheed TV-1 • TV-2 • T2V
Vought, Vought-Sikorsky, and LTV Aerospace aircraft - Flugzeuge und Lenkwaffen des Herstellers Vought - Самолёты Vought/LTV Aerospace
Vought, Vought-Sikorsky, and LTV Aerospace aircraft
Fighters VE-7/VE-8/VE-9 • V-141 • V-143 • FU • XF2U • XF3U • F4U • XF5U • F6U • F7U • F8U/F-8/XF8U-3 • Model 1600
Scout and Attack aircraft O2U • O3U • O4U • O5U • OS2U • XSO2U • SU • SBU • SB2U • XSB3U • TBU • AU • A2U • A-7 • YA-7F
Experimental/Unbuilt XC-142 • V-173 • XS2U • XWU
Names Corsair O2U • SBU • F4U/AU • A-7 (II)
Others Crusader (I/II) • Crusader III • Cutlass • Kingfisher • Pirate • Sea Wolf • Vindicator
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