Supriya Ghosh (Editor)

Brantly B 1

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Length
  
5.33 m

Designer
  
Newby O. Brantly

First flight
  
1946

The Brantly B-1 was a 2-seat, coaxial-rotor helicopter designed by Newby O. Brantly and constructed by the Pennsylvania Elastic Company, Brantly's employer.

Contents

Design and development

In 1946, Brantly started flight testing the B-1 prototype (NX69125), which used a 150 hp Franklin O-335 engine in the fabric fuselage and two three-bladed rotors that rotated at 320 rpm and were fitted coaxially. The collective, cyclic, and differential controls were enclosed in the rotor hubs and ran in an oil-bath. Each rotor blade weighed 5.5 kilos. It also had a fixed wheel undercarriage with a tailwheel under the tailfin.

Unfortunately, the design was too heavy and complex and was abandoned.

Specifications

Data from

General characteristics

  • Crew: 1
  • Capacity: 1
  • Length: 17 ft 6 in (5.33 m)
  • Height: 7 ft 9 in (2.36 m)
  • Empty weight: 1,325 lb (601 kg)
  • Gross weight: 2,000 lb (907 kg)
  • Powerplant: 1 × Franklin O-335 6-cyl. air-cooled horizontally=opposed piston engine, 150 hp (110 kW)
  • Main rotor diameter: × 29 ft 6 in (9 m)

    • Performance

  • Cruise speed: 113 mph; 98 kn (182 km/h)
  • Range: 398 mi; 346 nmi (640 km)

    • References

    Brantly B-1 Wikipedia
    (Text) CC BY-SA


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