Sikorsky H-19: Διαφορά μεταξύ των αναθεωρήσεων
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The H-19 was also used in the early days of the [[Vietnam War]] before being supplanted by the [[Sikorsky H-34|Sikorsky H-34 Choctaw]], which was based on the H-19.
==Variants==
;YH-19: Five early production S-55s for evaluation.
;H-19A: USAF version of the YH-19 powered by a 600hp R-1340-57 engine, redeisgnated UH-19A in 1962, 50 built.
;SH-19A: H-19As modified for Air-Sea Rescue, redesignated HH-19A in 1962.
;H-19B: H-19A with a more powerful 700hp R-1300-3 engine, redesignated UH-19B in 1962, 264 built.
;SH-19B: H-19Bs modified for Air-Sea Rescue, redesignated HH-19B in 1962.
;H-19C: US Army version of the H-19A, redesignated UH-19C in 1962, 72 built.
;H-19D: US Army version of the H-19B, redesignated UH-19D in 1962, 301 built.
;HO4S-1: US Navy version of the H-19A, 10 built.
;H04S-2: Project for rescue version for the United States Coast Guard, not built.
;H04S-3: Re-engined US Navy version with 700hp R-1300-3 engine, redesignated UH-19F in 1962, 79 built.
;HO4S-3G: United States Coast Guard version of the HO4S-3, redesignated HH-19G in 1962, 30 built.
;HRS-1: United States Marine Corps version of the HO4S for eight troops, 60 built.
;HRS-2: HRS-1 with equipment changes, 101 built.
;HRS-3: HRS-2 with a 700hp R-1300-3 engine, became CH-19E in 1962, 105 built and conversions from HRS-2.
;HRS-4: Project for HRS-3 with a 1025hp R-1820 radial engine, not built.
;UH-19A: H-19A redesignated in 1962.
;HH-19A: SH-19A redesignated in 1962.
;UH-19B: H-19B redesignated in 1962.
;HH-19B: SH-19B redesignated in 1962.
;CH-19E: HRS-3 redesignated in 1962.
;UH-19F: HO4S-3 redesignated in 1962.
;HH-19G: HO4S-3G redesignated in 1962
;S-55: Commercial version with 600hp R-1340 engine.
;S-55A: Commercial version with 800hp R-1300-3 engine.
;S-55C: S-55A with a 600hp R-1340 engine.
;S-55T: Modified aircraft with a 650shp Garrett-AIRResearch TSE331-3U-303 turboshaft and updated equipment.
;Whirlwind HAR21: HRS-2 for Royal Navy, ten delivered.
;Whirlwind HAS22: H04S-3 for Royal Navy, 15 delivered.
Later marks of [[Westland Whirlwind (rotary wing)|Whirlwind]] were built under licence.
==Operators==
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