Helicopter Sikorsky H-5
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Helicopter Sikorsky H-5. A photo. Characteristics.

Sikorsky H-5

Sikorsky H-5 is a four-seater American multi-purpose helicopter, upgraded R4, improved payload, increased reliability, ceiling and speed. 51 - civil variation of the helicopter. Built by Sikorsky Aero Engineering Corporation. H5 / S51 took off for the first time 16.02.1946. This helicopter was equipped for the first time with the autopilot, which made it much easier to control. Total built 379 such helicopters H5 / S51. The helicopter was widely used in the US Air Force and several other countries.

Helicopter Sikorsky H-5

Helicopter Sikorsky H-5 photo.

The helicopter H5 (the internal name of the developer R5) is designed as an apparatus with improved properties (speed, load capacity, ceiling) in order to replace the Sikorsky R4. The diameter of the main rotor is increased, the fuselage is lengthened, the passenger and pilot seats are located in a tandem. A more powerful engine with an output of 450 hp is installed. For the first time soared in August 1943. The US Army issued an order for 26 machines for testing (under the name YR5A), the first deliveries in February of 1945. Then the order for 100 helicopters (changed for carrying on the stretchers) was followed, of which 34 helicopters were manufactured and delivered.

Helicopter Sikorsky H-5 photo booths

Helicopter Sikorsky H-5 photo booths.

In February, 1946, the first flight made a modified version of YR5A, or S51 with improved properties. The cabin is enlarged to accommodate the pilot and three passengers. Eleven of these machines (designation R5F) were purchased by the USAF, ninety by fleet (name HO3S-1). Helicopters were used before 1957 in the US military. The licensed version of the helicopter in 1946 under the designation S51Dragonfly, equipped with the engine AlvisLeonides, began to be made in the UK, made 133 machines.

Features Helicopter Sikorsky H-5:

  • Crew: 1
  • The greatest number of passengers: 3
  • Length: 17,39m
  • The diameter of the rotor: 14,63m
  • The diameter of the tail rotor: 2,565m
  • Height: 3,86m
  • The area swept rotor: 168,2kv.m
  • Wing Profile: NACA.0012
  • The base chassis 3,07m
  • Track chassis 3,66m
  • Empty weight: 1718kg
  • Curb weight: 1853kg
  • The highest take-off weight: 2261kg
  • Volume of fuel tanks: 378,5l
  • Fuel mass in internal tanks: 272,2kg
  • Power point: 1 × piston Pratt & WhitneyR-985AN5
  • Engine power: 1 × 450l.s. (1 × 331kW (take-off))
  • The speed at FL: 130km / h
  • Practical range: 441km (with full fuel and 2 passengers)
  • Ferrying range: 674km (with an additional tank (136 kg of fuel) and without passengers)
  • Ceiling: 4511m
  • Static ceiling: 1615m
  • Rate of climb: 6,3m / s
  • Disk load: 13,43kg / sq.m (with the greatest take-off weight)
  • Thrust: 146W / kg (with the highest take-off weight)

Maximum speed:

  • at the ground: 167km / h
  • at the height of 1143: 174km / h

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