B1 RD, part 103 legal ultralight aircraft, Ultralight Aircraft Magazine.

B1 RD, Robertson Aircraft Company

Ultralight Aircraft Magazine - The Robertson B1-RD entered the American ultralight market in 1982.  It was designed by Glen Bashforth and Bruce Bashforth, with production done by the Robertson Aircraft Corporation. The B1 RD is a taildragger, with a steerable tailwheel and uses a bungee cord suspension system.

Robertson B1 RD part 103 ultralight aircraft.

The B1RD was available in single place configuration, but a two place ultralight trainer was also available from the company. The B1 RD was supplied as a kit taking approximately 100 hours to build. The kit featured bolt and rivet together aluminum tube construction covered in Dacron sail cloth.  Like many early ultralights the B1 RD featured a kin post and wiring bracing. 

Power was supplied by a number of engines including the Rotax 377, 447 and 503, as well as the Cayuna 430R. The original design used a belt drive, with a 68 inch two blade propeller. The engine was mounted in a tractor configuration under the wing with the belt drive point up over the wing. 

Control system is standard three axis control, stick and rudder control, with a center mounted stick, and left hand throttle. 

B1 RD Ultralight Aircraft Specifications And Images

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B1 RD Bird Ultralight
Wingspan: 32 ft 0 in (9.75 m)
Wing area: 162 sq ft (15.1 m2)
Empty weight: 220 lb (100 kg)
Gross weight: 500 lb (227 kg)
Fuel capacity: 4 U.S. gallons (15 L; 3.3 imp gal)
Powerplant: 1 × Cuyuna 430R two-cylinder, two-stroke aircraft engine, 30 hp (22 kW)

Performance
Maximum speed: 50 mph (80 km/h; 43 kn)
Cruise speed: 38 mph (33 kn; 61 km/h)
Stall speed: 15 mph (13 kn; 24 km/h)
Never exceed speed: 75 mph (65 kn; 121 km/h)
Range: 125 mi (109 nmi; 201 km)
Service ceiling: 14,000 ft (4,267 m)
G limits: +3/-2
Maximum glide ratio: 8.5:1
Rate of climb: 850 ft/min (4.3 m/s)
Rate of sink: 300 ft/min (1.5 m/s)


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