Pure helicopter configuration of the Rotor System Research Aircraft project; a 3-place helicopter.  In addition to the turbofan propulors, the main transmission and tail rotor are powered by General Electric T58-GE-5 / T58-GE-10 engines.  The equipped main rotor is that of the S-61 (H-3) while a conventional 5-blade tail rotor is used.


Data on design, manufacture and status

Design authority: Sikorsky Aircraft Corp.

Primary manufacturer: Sikorsky Aircraft Corp.

Parent type: Sikorsky S-72 RSRA

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: Tandem

Landing gear: Wheels (some retractable)

Layout and Dimensions

Data on aircraft size

Note: Only the main wheels were retractable

Overall Dimensions
Overall Height: 4.72 m 15.5 ft
Overall Length: 23.14 m 75.9 ft
Overall Width: 18.90 m 62.0 ft
Airframe Dimensions
Airframe Length: 19.41 m 63.7 ft
Airframe Width:  
Airframe Height: 4.57 m 15.0 ft
Landing Gear Dimensions
Landing Gear Base: 11.56 m 37.9 ft
Landing Gear Track:  
Cabin Dimensions
Cabin Internal Height:  
Cabin Internal Length:  
Cabin Internal Width:  

Weights and Performance

Data on aircraft weight and flight characteristics

Max Gross Weight (ground): 9,197 kg 20,276 lb
Max Gross Weight (airborne):  
Max Take-off Weight: 9,197 kg 20,276 lb
Empty Weight: 6,573 kg 14,490 lb
Useful Load: 2,624 kg 5,786 lb
Empty Weight Fraction: 0.715
Climb Performance
Max Rate of Climb:  
Hover Performance
Hover Ceiling IGE:  
Hover Ceiling OGE:  
Max Level Flight Speed: 296 km/h 160 kts
Never Exceed Speed:  
Service Ceiling:  
Range and Endurance
Max Range:  
Max Endurance: 1 hrs 1 hrs

Engine Details

Aircraft powerplant (lift and/or propulsion)

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

Number of engines: 2
Designation: GE T58-GE-5 turbine
Manufacturer: General Electric Company
Normal Ratings
Max continuous: 933 kW 1250 hp
Take-off / rated: 1119 kW 1500 hp
Intermediate: 1044 kW 1400 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 airfoil; RPM (S-72 RSRA): 209.09

Main Rotor Characteristics
Diameter: 18.90 m 62.00 ft
RPM: 203.0 rpm 203.0 rpm
Direction of Rotation: Counterclockwise
Hub Type: Fully articulated
Main Rotor Blade Characteristics
Blade Construction:
Blade Chord: 0.464 m 1.52 ft
Blade Tip Geometry: Conventional
Blade Twist: -0.140 rad -8.000 deg
Number of Blades: 5
Main Rotor Derived Characteristics
Disc Area: 280.48 m² 3019.2 ft²
Disc Loading: 32.79 kg/m² 6.716 lb/ft²
Solidity: 0.0781
Main Rotor Blade Derived Characteristics
Blade area per blade: 4.38 m² 47.1 ft²
Tip Speed: 200.86 m/s 659.0 fps

Primary Control Device

Data on primary control devices such as tail rotors

Tail Rotor Characteristics
Diameter: 3.23 m 10.60 ft
Configuration: Pusher
Direction of Rotation: Top blade aft
Tail Rotor Blade Characteristics
Number of Blades: 5
Blade Construction:  
Blade Chord:  
Blade Twist:  
Tail Rotor Derived Characteristics
Disc Area: 8.20 m² 88.3 ft²
Tail Rotor Blade Derived Characteristics
Tip Speed:  
Blade Area (per blade):  

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