J4B
Barnett J4B G-BWCW autogyro at The Helicopter Museum, Weston-super-Mare, UK
Role Recreational autogyro
National origin United States
Manufacturer Homebuilt
Designer Jerry Barnett

The Barnett J4B is a small gyroplane marketed in the United States by Barnett Rotorcraft for homebuilding. Originally flown as the J-3M with an open cockpit and fabric-covered sides, later versions have a fiberglass cockpit pod either partially or fully enclosing the pilot. Apart from the basic J4B, versions available in 2007 included the BRC540 (two seats side-by-side) and J4B2 (two seats in tandem).

Variants

J-3M
Original variant with 48.5 kW (65.0 hp) Continental A65 engine.[1]
J-4M
Improved J-3M with 63.5 kW (85.2 hp) Continental C85 engine.[1]
J4B
Single-seat autogyro with 23 ft rotor.
J4B-2
Two-seat variant of the J4B with a 25ft 4in rotor.

Specifications (typical J4B)

General characteristics

  • Crew: one pilot
  • Length: 12 ft 4 in (3.76 m)
  • Height: 7 ft 8 in (2.34 m)
  • Empty weight: 530 lb (240 kg)
  • Gross weight: 880 lb (400 kg)
  • Powerplant: 1 × Continental O-200 , 100 hp (75 kW)
  • Main rotor diameter: 23 ft 0 in (6.10 m)
  • Main rotor area: 314 sq ft (29.2 m2)

Performance

  • Maximum speed: 125 mph (200 km/h, 109 kn)

References

Citations

  1. 1 2 Taylor 1981, p. 121.

Bibliography

  • Taylor, Michael J. H. (1989). Jane's Encyclopedia of Aviation. London: Studio Editions. p. 121.
  • Popular Rotorcraft Association (archived)
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