Sikorsky HO4S-3

Re-engined US Navy & Canadian version with 700HP Wright R-1300 Cyclone engine. Redesignated UH-19F (American variant) & HO4S-3 (Canadian & Dutch variants) in 1962. 103 built: including 61 for USN, 3 for Dutch MLD, 15 for UK RN as Whirlwind HAS.22, 10 for RCN, & 14 for USCG.

HO4S-3: 133844 - 133853, contract NOa(s) 42-471 (MDAP) cancelled, airframes not built.

HO4S-3: 138432 - 138459, contract cancelled, airframes not built.

Airframes (105)

C/N	Model	Built	Reg
55-723	ho4s-3	1954	138600
55-724	ho4s-3	1954	138601
55-729	ho4s-3	1954	1308
55-730	ho4s-3	1954	1309
55-746	ho4s-3	1954	1310	w/o 1961
55-867	ho4s-3	1955	55867
55-875	ho4s-3	1955	55875
55-876	ho4s-3	1955	55876
55-877	ho4s-3	1955	55877
55-878	ho4s-3	1955	55878
55-885	ho4s-3	1955	55885
55-886	ho4s-3	1955	55886	w/o 1961
55-887	ho4s-3	1955	55887	w/o 1958
55-891	ho4s-3	1955	55891
55-892	ho4s-3	1955	55892	w/o 1957

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Operators

1951-1957	US Navy S-55 H-19
1951-1966	US Coast Guard S-55 H-19
1952-1968	Royal Canadian Navy (1945-1968) S-55 H-19
1952-1962	Fleet Air Arm S-55 H-19
1953-1963	Marine Luchtvaartdienst S-55 H-19
1956-1968	Suid-Afrikaanse Lugmag S-55 H-19
1971-	Aviodome