Developed in 1953, designated YHO-3BR in the US Army.  A two-seat helicopter with wheel-skid combination landing gear.  As the maiden flight, the first prototype flew in 1943; the second prototype flew in 1946 before the B-2 received its FAA certification [Ref 312].


Data on design, manufacture and status

Design authority: Brantly Helicopter Corp.

Primary manufacturer: Brantly Helicopter Corp.

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: 1-2

Crew seating: Side-by-side

Landing gear: Other

Layout and Dimensions

Data on aircraft size

Update Required:

Overall Dimensions
Overall Height: 2.13 m 7.0 ft
Overall Length:  
Overall Width: 7.24 m 23.7 ft
Airframe Dimensions
Airframe Length: 6.63 m 21.8 ft
Airframe Width:  
Airframe Height: 2.13 m 7.0 ft
Landing Gear Dimensions
Landing Gear Base:  
Landing Gear Track: 1.73 m 5.7 ft
Cabin Dimensions
Cabin Internal Height:  
Cabin Internal Length:  
Cabin Internal Width:  

Weights and Performance

Data on aircraft weight and flight characteristics

Cruise Speed: 95 mph (152.888 km/h)

Max Gross Weight (ground): 726 kg 1,600 lb
Max Gross Weight (airborne):  
Max Take-off Weight: 726 kg 1,600 lb
Empty Weight: 445 kg 980 lb
Useful Load: 281 kg 620 lb
Empty Weight Fraction: 0.613
Climb Performance
Max Rate of Climb: 8 m/s 1,580 fpm
Hover Performance
Hover Ceiling IGE:  
Hover Ceiling OGE: 1,433 m 4,700 ft
Max Level Flight Speed: 161 km/h 87 kts
Never Exceed Speed:  
Service Ceiling: 3,475 m 11,400 ft
Range and Endurance
Max Range: 483 km 261 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: Lycoming VO-360-A1A reciprocating
Manufacturer: Lycoming Engines
Normal Ratings
Max continuous:  
Take-off / rated: 104 kW 140 hp
OEI Ratings
OEI contingency:  
OEI continuous:  
OEI 30-second:  
OEI intermediate:  

Primary Lift Device

Data on primary lift devices such as main rotors

Aluminum skin bonded to polyurethane, riveted to Aluminum leading edge spar [Ref 318].

Main Rotor Characteristics
Diameter: 7.24 m 23.74 ft
Direction of Rotation: Counterclockwise
Hub Type:
Main Rotor Blade Characteristics
Blade Construction: All-metal
Blade Chord: 0.225 m 0.74 ft
Blade Tip Geometry: Flat
Blade Twist:  
Number of Blades: 3
Main Rotor Derived Characteristics
Disc Area: 41.12 m² 442.6 ft²
Disc Loading: 17.65 kg/m² 3.615 lb/ft²
Solidity: 0.0593
Main Rotor Blade Derived Characteristics
Blade area per blade: 0.81 m² 8.7 ft²
Tip Speed:  

Primary Control Device

Data on primary control devices such as tail rotors

Tapered chord: Root 0.1063 meter, Tip 0.0687 meter [Ref 318]

Tail Rotor Characteristics
Diameter: 1.30 m 4.25 ft
Configuration: Tractor
Direction of Rotation: Top blade fwd
Tail Rotor Blade Characteristics
Number of Blades: 2
Blade Construction:  
Blade Chord:  
Blade Twist:  
Tail Rotor Derived Characteristics
Disc Area: 1.32 m² 14.2 ft²
Tail Rotor Blade Derived Characteristics
Tip Speed:  
Blade Area (per blade):  

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