Sikorsky HRS-1

1951

USMC version of the HO4S-1 with P&W R-1340-57 Wasp engine for eight troops, 60 built, plus one static airframe used for testing.

Airframes (61)

C/N	Model	Built	Reg
55-082	hrs-1	1952	127842

Operators

1951-1960	US Marine Corps S-55 H-19
1951-1967	US Air Force S-55 H-19
1951-1957	US Navy S-55 H-19
1953-??	Armée de l'Air S-55 H-19
1954-??	Royal Thai Air Force S-55 H-19
1957-1969	Fuerza Aerea Republica Dominicana S-55 H-19