A version of the S-55 equipped with the more powerful Wright R-1300-3.


Data on design, manufacture and status


Primary flight and mechanical characteristics

VTOL type: Helicopter

Lift configuration: Single main rotor

Dedicated control device: Tail rotor

Crew required: 1-2

Crew seating: Side-by-side

Landing gear: Wheels (non-retractable)

Layout and Dimensions

Data on aircraft size

Overall Dimensions
Overall Height: 4.07 m 13.4 ft
Overall Length: 18.99 m 62.3 ft
Overall Width: 16.15 m 53.0 ft
Airframe Dimensions
Airframe Length: 12.85 m 42.2 ft
Airframe Width: 3.53 m 11.6 ft
Airframe Height:  
Landing Gear Dimensions
Landing Gear Base: 3.16 m 10.4 ft
Landing Gear Track: 2.64 m 8.7 ft
Cabin Dimensions
Cabin Internal Height:  
Cabin Internal Length:  
Cabin Internal Width:  

Weights and Performance

Data on aircraft weight and flight characteristics

Cruise Speed: 91 mph (146.45 km/h)

Max Gross Weight (ground): 3,583 kg 7,900 lb
Max Gross Weight (airborne):  
Max Take-off Weight: 3,583 kg 7,900 lb
Empty Weight: 2,381 kg 5,250 lb
Useful Load: 1,202 kg 2,650 lb
Empty Weight Fraction: 0.665
Climb Performance
Max Rate of Climb: 5 m/s 1,020 fpm
Hover Performance
Hover Ceiling IGE:  
Hover Ceiling OGE:  
Max Level Flight Speed: 180 km/h 97 kts
Never Exceed Speed:  
Service Ceiling:  
Range and Endurance
Max Range: 579 km 313 nm
Max Endurance:  

Engine Details

Aircraft powerplant (lift and/or propulsion)

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

Normal Ratings
Max continuous:  
Take-off / rated:  
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: 16.15 m 53.00 ft
Direction of Rotation: Counterclockwise
Hub Type:
Main Rotor Blade Characteristics
Blade Construction:
Blade Chord:  
Blade Tip Geometry: Conventional
Blade Twist:  
Number of Blades: 3
Main Rotor Derived Characteristics
Disc Area: 204.96 m² 2206.3 ft²
Disc Loading: 17.48 kg/m² 3.581 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

Tail Rotor Characteristics
Diameter: 2.64 m 8.66 ft
Configuration: Pusher
Direction of Rotation: Top blade aft
Tail Rotor Blade Characteristics
Number of Blades: 2
Blade Construction:  
Blade Chord:  
Blade Twist:  
Tail Rotor Derived Characteristics
Disc Area: 5.47 m² 58.9 ft²
Tail Rotor Blade Derived Characteristics
Tip Speed:  
Blade Area (per blade):  

Related VFS Resources

Resources related to the H-19B/HO4S-3/HRS-3 , provided by the Vertical Flight Society.
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Web files from vtol.org
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Related Public Resources

Resources related to the H-19B/HO4S-3/HRS-3 , provided by public sources across the internet.