Originating from the redesign of the R-5A (VS-317) developed in 1945.  he passenger capacity is upgraded to four. The S-51 is the commercial version.

See this at the American Helicopter Museum in West Chester, PA, USA.

Overview

Data on design, manufacture and status

Design authority: Sikorsky Aircraft Corp.

Primary manufacturer: Sikorsky Aircraft Corp.

Parent type: Sikorsky S-51

Aircraft status: No longer flying

Configuration

Primary flight and mechanical characteristics

VTOL type: Helicopter

Lift configuration: Single main rotor

Dedicated control device: Tail rotor

Crew required: 1-2

Crew seating: Tandem

Landing gear: Wheels (non-retractable)

Layout and Dimensions

Data on aircraft size

Overall Dimensions
Overall Height: 3.94 m 12.9 ft
Overall Length: 17.39 m 57.0 ft
Overall Width: 14.63 m 48.0 ft
Airframe Dimensions
Airframe Length: 12.54 m 41.1 ft
Airframe Width:  
Airframe Height: 3.94 m 12.9 ft
Landing Gear Dimensions
Landing Gear Base: 3.07 m 10.1 ft
Landing Gear Track: 3.66 m 12.0 ft
Cabin Dimensions
Cabin Internal Height:  
Cabin Internal Length:  
Cabin Internal Width:  

Weights and Performance

Data on aircraft weight and flight characteristics

Cruise Speed: 85 mph (136.794 km/h)

Weights
Max Gross Weight (ground): 2,495 kg 5,500 lb
Max Gross Weight (airborne):  
Max Take-off Weight: 2,495 kg 5,500 lb
Empty Weight: 1,803 kg 3,975 lb
Useful Load: 692 kg 1,525 lb
Empty Weight Fraction: 0.723
Climb Performance
Max Rate of Climb: 5 m/s 1,000 fpm
Hover Performance
Hover Ceiling IGE:  
Hover Ceiling OGE:  
Limitations
Max Level Flight Speed:  
Never Exceed Speed: 198 km/h 107 kts
Service Ceiling: 4,115 m 13,500 ft
Range and Endurance
Max Range: 418 km 226 nm
Max Endurance:  

Engine Details

Aircraft powerplant (lift and/or propulsion)

Provided powerplant data is for uninstalled, sea level, static operations.

Powerplant
Number of engines: 1
Designation: P&W R-985-AN-7 reciprocating
Manufacturer: Pratt & Whitney
Normal Ratings
Max continuous:  
Take-off / rated: 336 kW 450 hp
Intermediate:  
Maximum:  
OEI Ratings
OEI contingency:  
OEI continuous:  
OEI 30-second:  
OEI intermediate:  

Primary Lift Device

Data on primary lift devices such as main rotors

Main Rotor Characteristics
Diameter: 14.63 m 48.00 ft
RPM:  
Direction of Rotation: Counterclockwise
Hub Type: Fully articulated
Main Rotor Blade Characteristics
Blade Construction: Metal Spar, Plywood, Fabric cover
Blade Chord:  
Blade Tip Geometry:
Blade Twist:  
Number of Blades: 3
Main Rotor Derived Characteristics
Disc Area: 168.11 m² 1809.6 ft²
Disc Loading: 14.84 kg/m² 3.039 lb/ft²
Solidity:  
Main Rotor Blade Derived Characteristics
Blade area per blade:  
Tip Speed:  

Primary Control Device

Data on primary control devices such as tail rotors

Tail Rotor Characteristics
Diameter: 2.57 m 8.42 ft
Configuration: Pusher
Direction of Rotation: Top blade aft
RPM:  
Tail Rotor Blade Characteristics
Number of Blades: 3
Blade Construction: Laminated Wood
Blade Chord:  
Blade Twist:  
Tail Rotor Derived Characteristics
Disc Area: 5.17 m² 55.6 ft²
Solidity:  
Tail Rotor Blade Derived Characteristics
Tip Speed:  
Blade Area (per blade):  

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Related Public Resources

Resources related to the S-51 , provided by public sources across the internet.

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