Barnett J4B
# 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).

## 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 $m^2)$

Performance

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