Beginning development in 1945, known as the XH-39 by the U.S. Army.


Data on design, manufacture and status

Design authority: Sikorsky Aircraft Division, United Aircraft and Transport Corporation

Primary manufacturer: Sikorsky Aircraft Division, United Aircraft and Transport Corporation

Parent type: No type defined

Aircraft status: No longer flying


Primary flight and mechanical characteristics

VTOL type: Helicopter

Lift configuration: Single main rotor

Dedicated control device: Tail rotor

Crew required: 2

Crew seating: Side-by-side

Landing gear: Wheels (all retractable)

Layout and Dimensions

Data on aircraft size

Overall Dimensions
Overall Height: 3.40 m 11.2 ft
Overall Length: 12.67 m 41.6 ft
Overall Width: 10.67 m 35.0 ft
Airframe Dimensions
Airframe Length: 9.14 m 30.0 ft
Airframe Width: 1.52 m 5.0 ft
Airframe Height:  
Landing Gear Dimensions
Landing Gear Base:  
Landing Gear Track: 2.44 m 8.0 ft
Cabin Dimensions
Cabin Internal Height: 1.52 m 5.0 ft
Cabin Internal Length: 2.13 m 7.0 ft
Cabin Internal Width: 1.22 m 4.0 ft

Weights and Performance

Data on aircraft weight and flight characteristics

Cruise Speed: 135 mph (217.261 km/h)

Max Gross Weight (ground): 1,633 kg 3,600 lb
Max Gross Weight (airborne):  
Max Take-off Weight: 1,633 kg 3,600 lb
Empty Weight: 930 kg 2,050 lb
Useful Load: 703 kg 1,550 lb
Empty Weight Fraction: 0.570
Climb Performance
Max Rate of Climb: 6 m/s 1,260 fpm
Hover Performance
Hover Ceiling IGE:  
Hover Ceiling OGE:  
Max Level Flight Speed: 251 km/h 136 kts
Never Exceed Speed:  
Service Ceiling: 7,468 m 24,501 ft
Range and Endurance
Max Range: 402 km 217 nm
Max Endurance:  

Engine Details

Aircraft powerplant (lift and/or propulsion)

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

Number of engines: 1
Designation: Turbomeca Artouste II (XT-51-T-3) turbine
Manufacturer: Turbomeca
Normal Ratings
Max continuous:  
Take-off / rated: 317 kW 425 hp
OEI Ratings
OEI contingency:  
OEI continuous:  
OEI 30-second:  
OEI intermediate:  

Primary Lift Device

Data on primary lift devices such as main rotors

NACA 0012 air foil

Main Rotor Characteristics
Diameter: 10.67 m 35.00 ft
Direction of Rotation: Counterclockwise
Hub Type: Fully articulated
Main Rotor Blade Characteristics
Blade Construction: All-metal
Blade Chord:  
Blade Tip Geometry: Conventional
Blade Twist: -0.140 rad -8.000 deg
Number of Blades: 4
Main Rotor Derived Characteristics
Disc Area: 89.38 m² 962.1 ft²
Disc Loading: 18.27 kg/m² 3.742 lb/ft²
Main Rotor Blade Derived Characteristics
Blade area per blade:  
Tip Speed:  

Primary Control Device

Data on primary control devices such as tail rotors

NACA 0012 air foil

Tail Rotor Characteristics
Diameter: 1.96 m 6.42 ft
Configuration: Pusher
Direction of Rotation: Top blade fwd
Tail Rotor Blade Characteristics
Number of Blades: 3
Blade Construction:  
Blade Chord:  
Blade Twist:  
Tail Rotor Derived Characteristics
Disc Area: 3.00 m² 32.3 ft²
Tail Rotor Blade Derived Characteristics
Tip Speed:  
Blade Area (per blade):  

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Related Public Resources

Resources related to the S-59 (XH-39), provided by public sources across the internet.