With a passenger capacity of 19 in additon to the two pilots, the Model PH-42 (Model 44) is the same as the H-21C except for its performance.


Data on design, manufacture and status

Design authority: Vertol Aircraft Corporation

Primary manufacturer: Vertol Aircraft Corporation

Parent type: No type defined

Aircraft status: No longer flying


Primary flight and mechanical characteristics

VTOL type: Helicopter

Lift configuration: Tandem (Fore/aft) (x2)

Crew required: 2

Crew seating: Side-by-side

Landing gear: Wheels (non-retractable)

Layout and Dimensions

Data on aircraft size

Overall Dimensions
Overall Height: 5.18 m 17.0 ft
Overall Length:  
Overall Width: 21.00 m 68.9 ft
Airframe Dimensions
Airframe Length: 16.80 m 55.1 ft
Airframe Width:  
Airframe Height:  
Landing Gear Dimensions
Landing Gear Base: 3.79 m 12.4 ft
Landing Gear Track:  
Cabin Dimensions
Cabin Internal Height: 1.76 m 5.8 ft
Cabin Internal Length: 4.50 m 14.8 ft
Cabin Internal Width: 1.60 m 5.2 ft

Weights and Performance

Data on aircraft weight and flight characteristics

Cruise Speed: 98 mph (157.716 km/h)

Max Gross Weight (ground): 6,033 kg 13,300 lb
Max Gross Weight (airborne):  
Max Take-off Weight: 6,033 kg 13,300 lb
Empty Weight: 3,629 kg 8,000 lb
Useful Load: 2,404 kg 5,300 lb
Empty Weight Fraction: 0.602
Climb Performance
Max Rate of Climb: 6 m/s 1,080 fpm
Hover Performance
Hover Ceiling IGE:  
Hover Ceiling OGE:  
Max Level Flight Speed:  
Never Exceed Speed:  
Service Ceiling: 2,880 m 9,450 ft
Range and Endurance
Max Range: 547 km 295 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: 951 kW 1275 hp
Take-off / rated: 1063 kW 1425 hp
OEI Ratings
OEI contingency:  
OEI continuous:  
OEI 30-second:  
OEI intermediate:  

Primary Lift Device

Data on primary lift devices such as main rotors

Fwd rotor rotates ant-clockwise, aft rotor rotates clockwise

Main Rotor Characteristics
Diameter: 13.41 m 44.00 ft
Direction of Rotation: Counter-rotating
Hub Type: Fully articulated
Main Rotor Blade Characteristics
Blade Construction: Metal with D section steel spar
Blade Chord:  
Blade Tip Geometry: Conventional
Blade Twist:  
Number of Blades: 3
Main Rotor Derived Characteristics
Disc Area: 141.26 m² 1520.6 ft²
Disc Loading: 21.35 kg/m² 4.373 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
Configuration: Unknown
Direction of Rotation: Unknown
Tail Rotor Blade Characteristics
Number of Blades:  
Blade Construction: N/A
Blade Chord:  
Blade Twist:  
Tail Rotor Derived Characteristics
Disc Area:  
Tail Rotor Blade Derived Characteristics
Tip Speed:  
Blade Area (per blade):  

Related VFS Resources

Resources related to the Model PH-42 (44), provided by the Vertical Flight Society.
Forum Proceedings
Vertiflite articles
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Web files from vtol.org
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Webpages from vtol.org
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Related Public Resources

Resources related to the Model PH-42 (44), provided by public sources across the internet.