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General Info

Sikorsky H-19 Chickasaw  S-55

An HO4S of the Royal Canadian Navy
Manufacturer Sikorsky Aircraft
Primary users United States ArmyUnited States Air Force
United States Navy
United States Coast Guard
Number built 1,728
History
Introduction date 16 April 1950 (U.S. Air Force)
First flight 10 November 1949
Retired 26 February 1969 (U.S. Navy)
Variants Westland Whirlwind
Developed into Sikorsky H-34 (S-58 / Wessex)
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History Sikorsky 
S-55/H19 Chickasaw Introduction date 16 April 1950
(U.S. Air Force) First flight 10 November 1949



The Sikorsky H-19 Chickasaw (company model number S-55) is a multi-purpose piston-engined helicopter that was used by the United States Army and United States Air Force. It was also license-built by Westland Aircraft as the Westland Whirlwind in the United Kingdom. United States Navy and United States Coast Guard models were designated HO4S, while those of the U.S. Marine Corps were designated HRS. In 1962, the U.S. Navy, U.S. Coast Guard and U.S. Marine Corps versions were all redesignated as H-19s like their U.S. Army and U.S. Air Force counterparts.

Development

HRS-1 of the USMC, on display at a museum, 2014

Development of the H-19 was initiated privately by Sikorsky without government sponsorship. The helicopter was initially designed as a testbed for several novel design concepts intended to provide greater load-carrying ability in combination with easy maintenance. Under the leadership of designer Edward F. Katzenberger, a mockup was designed and fabricated in less than one year.

The first customer was the United States Air Force, which ordered five YH-19 aircraft for evaluation; the YH-19's first flight was on 10 November 1949, less than a year after the program start date. This was followed by delivery of the first YH-19 to the U.S. Air Force on 16 April 1950 and delivery of the first HO4S-1 helicopter to the U. S. Navy on 31 August 1950. A U.S. Air Force YH-19 was sent to Korea for service trials in March 1951, where it was joined by a second YH-19 in September 1951. On 27 April 1951, the first HRS-1 was delivered to the U.S. Marine Corps, and on 2 May 1951, the first S-55 was delivered to Westland Aircraft.

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Gallery

 Photo Gallery
S-55/H19 Chickasaw Introduction date 16 April 1950 (U.S. Air Force) First flight 10 November 1949

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Howard Sikorsky helicopters MD

Sikorsky, a Lockheed Martin Company
S-55/H19 Chickasaw Introduction date 16 April 1950 (U.S. Air Force) First flight 10 November 1949

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General Info

  • Crew: 2
  • Capacity: ten troops or eight stretchers
  • Length: 42 ft 2 in (12.85 m) fuselage length excluding tail and main rotors
  • Height: 13 ft 4 in (4.06 m)
  • Empty weight: 4,795 lb (2,175 kg)
  • Gross weight: 7,500 lb (3,402 kg)
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Powerplant

  • Powerplant: 1 × Pratt & Whitney R-1340-57 9-cylinder air-cooled radial piston engine, 600 hp (450 kW)
  • Main rotor diameter: 53 ft (16 m)
  • Main rotor area: 2,206 sq ft (204.9 m2)
  • Tail rotor diameter: 8 ft 8 in (2.64 m)
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Specifications

  • Maximum speed: 101 mph (163 km/h, 88 kn)
  • Cruise speed: 85 mph (137 km/h, 74 kn)
  • Range: 450 mi (720 km, 390 nmi)
  • Service ceiling: 10,500 ft (3,200 m)
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Armament

  • Aircraft of comparable role, configuration, and era

    • Harbin Z-5 – Chinese variant of Mi-4
    • Mil Mi-4 – similar design and built in response to H-19
     
Special Links S-55/H19 Chickasaw Introduction date 16 April 1950 (U.S. Air Force) First flight 10 November 1949

Links to Youtube & Others

At the end of the 1940s, Sikorsky started work on a helicopter project. The aircraft should be able to transport ten passengers and was equipped with a radial engine installed in the nose, coupled to a driveshaft that passed through the cockpit between the two pilots. The cabin was located directly below the main rotor while the tail rotor was fixed to a long tailboom.

Sikorsky H-19 Chickasaw S-55

Another feature of the YH-19 was a horizontal half tailplane on the starboard side with an endplate vertical fin.

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Youtube Link

An outstanding feature of the S-55/YH-19 was the location of its engine in the nose of the aircraft where it is easily accessible for maintenance work

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