|Role||light coaxial-rotor helicopter|
|Manufacturer||Brantly Helicopter Corporation|
|Designer||Newby O. Brantly|
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.
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.
Data from 
- 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)
- Cruise speed: 113 mph; 98 kn (182 km/h)
- Range: 398 mi; 346 nmi (640 km)
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