Barnett J4B

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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). A J4B2 piloted by Ron Merkle holds a coast-to-coast speed record in the United States for gyrocopters.


Single-seat autogyro with 23 ft rotor.
Two-seat variant of the J4B with a 25ft 4in rotor.

Specifications (typical J4B)[edit]

General characteristics

  • Crew: one pilot
  • Length: 12 ft 4 in (3.76 m)
  • Main rotor diameter: 23 ft 0 in (6.10 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)


  • Maximum speed: 125 mph (200 km/h)


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