Sikorsky S-55
Technical Specifications

First Flight: November 1949
Number Built: 1281 for military and commercial service
Length: 42 feet  3 inches
Main Rotor Diameter: 53 feet 
Tail Rotor Diameter:   8 feet 9 inches
Height: 13 feet 4 inches
Max Take-Off Wt.: 7,540 lbs.
Empty Wt.: 5,250 lbs.
Max Cruising Speed: 112 mph   97 kts
Normal Cruising Speed:   91 mph   79 kts
Service Ceiling: 10,600 feet
Fuel Capacity: 185 US gallons
Range: 405 miles 
Fuel Type: N/A
Fuel Consumption: N/A
Engine: 1 Pratt & Whitney S3H2 rated @ 600 HP 
Seating: 7 Passengers 
Crew: 2 Pilots 

Engine Specifications
Pratt & Whitney S3H2

Type: 8 cylinder air cooled radial
Length: N/A
Diameter: N/A
Bore: N/A
Stroke: N/A
Displacement: N/A
Compression Ratio: N/A
Dry Weight: N/A
Ignition: N/A
Fuel Grade: N/A
Carburation: N/A
Performance: 600 HP