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.
| Brantly B-1 | |
|---|---|
| Role | light coaxial-rotor helicopter |
| Manufacturer | Brantly Helicopter Corporation |
| Designer | Newby O. Brantly |
| First flight | 1946 |
| Status | abandoned |
Design and development
editIn 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.[1]
Unfortunately, the design was too heavy and complex and was abandoned.
Specifications
editData from [2]
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 (182 km/h, 98 kn)
- Range: 400 mi (640 km, 350 nmi)
References
edit- ^ Simpson, R.W. (26 May 1998). Airlife's Helicopters and Rotorcraft. The Crowood Press Ltd. ISBN 978-1853109683.
- ^ Lambermont, Paul Marcel; Pirie, Anthony (1970). Helicopters and autogyros of the world (Illustrated, revised ed.). Barnes.