Barnett J4B

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).

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

Variants

J-3M

Original variant with 48.5 kW (65.0 hp) Continental A65 engine.

J-4M

Improved J-3M with 63.5 kW (85.2 hp) Continental C85 engine.

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

Bibliography

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

External links

• Barnett Rotorcraft company website