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Sikorsky H-19 Chickasaw / S-55 / HO4S - HRS helicopter

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Specifications Comment this helicopter
Picture H-19_Chickasaw__S-55__HO4S__HRS
General
Manufacturer Sikorsky
Type H-19 Chickasaw / S-55 / HO4S - HRS
Introduced 1/1/1950
In production? No
Units produced 1550
Price US $ 0.00
Dimensions
Overall Length 62.6 ft
Length 42.2 ft
Height 13.1 ft
Width 0 ft
   
   
Description

The Sikorsky H-19 Chikasaw (aka the S-55, Westland Whirlwind, HO4S,) was a multipurpose helicopter from the 1940s. It was predominantly used by the US Air Force and Army, but it was also produced under license by Westland.

The S-55 is notable for its development, which did not rely on a government contract or any form of government funding.

Still, the S-55 was ordered by every branch of the US military. Each with a different designation, since uniform designations only came into effect after 1962.

The S-55’s design incorporated a number of innovations. These included flapping hinges on the rotor blades nine inches from the center of the rotor.

This improved the flight characteristics of the S-55 specifically when it comes to transport flight missions. The engine placement was forward of the main cabin and below the crew compartment, which also provides for better transport performance and easier maintenance.

While early variants were equipped with a Pratt & Whitney R-1340-57 with 600 horsepower, the US Navy felt there was too little power and upped the power to 700 horsepower with the Wright R-1300-3.

Interestingly, the marine variant HRS-2 had 1-pound rocket motors in the tip caps of the main rotor. This added 35 pounds of thrust per blade. The system added 67 pounds to the aircraft’s weight.

The S-55 was a highly successful and really was the first true transport helicopter used by the US armed forces. There were at the very least 37 main variants with some sub-variants as well for good measure.

The helicopter was officially retired by the US Navy in 1969 and a total of 1728 were built during the helicopter’s operational life.

After its military retirement interest from civilian customers was such that Sikorsky provided conversion kits that could be applied to military surplus units to make them suitable for civilian use.

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Design features
  • Engine in nose section of fuselage
  • Quadricycle, non retractable, landing gear
  • All metal, semi-monocoque, fuselage construction
  • Box-like cargo / passenger cabin
Description

The Sikorsky H-19 Chikasaw (aka the S-55, Westland Whirlwind, HO4S,) was a multipurpose helicopter from the 1940s. It was predominantly used by the US Air Force and Army, but it was also produced under license by Westland.

The S-55 is notable for its development, which did not rely on a government contract or any form of government funding.

Still, the S-55 was ordered by every branch of the US military. Each with a different designation, since uniform designations only came into effect after 1962.

The S-55’s design incorporated a number of innovations. These included flapping hinges on the rotor blades nine inches from the center of the rotor.

This improved the flight characteristics of the S-55 specifically when it comes to transport flight missions. The engine placement was forward of the main cabin and below the crew compartment, which also provides for better transport performance and easier maintenance.

While early variants were equipped with a Pratt & Whitney R-1340-57 with 600 horsepower, the US Navy felt there was too little power and upped the power to 700 horsepower with the Wright R-1300-3.

Interestingly, the marine variant HRS-2 had 1-pound rocket motors in the tip caps of the main rotor. This added 35 pounds of thrust per blade. The system added 67 pounds to the aircraft’s weight.

The S-55 was a highly successful and really was the first true transport helicopter used by the US armed forces. There were at the very least 37 main variants with some sub-variants as well for good measure.

The helicopter was officially retired by the US Navy in 1969 and a total of 1728 were built during the helicopter’s operational life.

After its military retirement interest from civilian customers was such that Sikorsky provided conversion kits that could be applied to military surplus units to make them suitable for civilian use.

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Design features:
  • Engine in nose section of fuselage
  • Quadricycle, non retractable, landing gear
  • All metal, semi-monocoque, fuselage construction
  • Box-like cargo / passenger cabin
Performance
Persons 14
Max. Range 400 mi
Cruise Speed 85 mph
Max. Speed 101 mph
Max. rate of Climb 700 ft/min
HOGE ceiling 0 ft
Service Ceiling 10500 ft
Gross Weight 7908 lb
Empty Weigt 4800 lb
Useful Load 3108 lb
Dynamic system
Fuel Capacity 185 gallons
Number of Engines 1
Engine Type Piston
Engine Code Pratt & Whitney R-1340-3
Horse Power 697
Rotorhead Fully articulated
Number of rotorblades 3
Rotor Diameter 53 ft
Number of tail rotorblades 2
Tailrotor Diameter 8.2 ft
Blueprints & model
Manufacturer Website manufacturer..
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