Protoype of the Type that would become the H-37 Type series in production for USMC/US Army.

Overview

Data on design, manufacture and status

Configuration

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 (some retractable)

Layout and Dimensions

Data on aircraft size

Overall Dimensions
Overall Height:  
Overall Length:  
Overall Width:  
Airframe Dimensions
Airframe Length:  
Airframe Width:  
Airframe Height:  
Landing Gear Dimensions
Landing Gear Base:  
Landing Gear Track:  
Cabin Dimensions
Cabin Internal Height:  
Cabin Internal Length:  
Cabin Internal Width:  

Weights and Performance

Data on aircraft weight and flight characteristics

Weights
Max Gross Weight (ground):  
Max Gross Weight (airborne):  
Max Take-off Weight:  
Empty Weight:  
Useful Load:  
Empty Weight Fraction:  
Climb Performance
Max Rate of Climb:  
Hover Performance
Hover Ceiling IGE:  
Hover Ceiling OGE:  
Limitations
Max Level Flight Speed:  
Never Exceed Speed:  
Service Ceiling:  
Range and Endurance
Max Range:  
Max Endurance:  

Engine Details

Aircraft powerplant (lift and/or propulsion)

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

Powerplant
Number of engines: 2
Normal Ratings
Max continuous:  
Take-off / rated:  
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

Originally fitted with blades using the NACA 0012 airfoil, higher-performing wide-chord blades using the NACA 0010.9 airfoil were retrofitted across all models.

Main Rotor Characteristics
Diameter: 21.95 m 72.00 ft
RPM: 184.0 rpm 184.0 rpm
Direction of Rotation: Unknown
Hub Type: Fully articulated main rotor head with a 24-inch offset flapping hinge
Main Rotor Blade Characteristics
Blade Construction: Hollow extruded aluminum spar with 27 honeycomb filled, aluminum skinned pockets bonded to the spar, with steel cuffs.
Blade Chord: 0.601 m 1.97 ft
Blade Tip Geometry: Square tips
Blade Twist: -0.140 rad -8.000 deg
Number of Blades: 5
Main Rotor Derived Characteristics
Disc Area: 378.25 m² 4071.6 ft²
Disc Loading:  
Solidity: 0.0871
Main Rotor Blade Derived Characteristics
Blade area per blade: 6.59 m² 71.0 ft²
Tip Speed: 211.43 m/s 693.7 fps

Primary Control Device

Data on primary control devices such as tail rotors

Tail Rotor Characteristics
Diameter: 4.57 m 15.00 ft
Configuration: Pusher
Direction of Rotation: Top blade fwd
RPM:  
Tail Rotor Blade Characteristics
Number of Blades: 4
Blade Construction: All metal (aluminum)
Blade Chord: 0.343 m 1.13 ft
Blade Twist: -0.17 rad -10.0 deg
Tail Rotor Derived Characteristics
Disc Area: 16.42 m² 176.7 ft²
Solidity: 0.1910
Tail Rotor Blade Derived Characteristics
Tip Speed:  
Blade Area (per blade): 0.784 m² 8.44 ft²

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