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– plans and instructions,
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– video,
– a huge amount of useful information for building an airplane.

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The CX4 is a low wing, single-seat, conventional landing gear equipped aircraft, designed to be simple to build and safe to fly.

The name of the plane, CX4, is taken from an old radio show featuring Hop Harrigan, whose plane was called CX4.

The aircraft is all metal, 6061-T6 aluminium, except the cowling. The aluminum main gear legs are sourced from a Monnett Sonerai with hydraulic disc toe brakes. It has a heater and ventilation system for all season flying. The aircraft can be built with an optional 3 gal aux fuel tank. The CX4’s standard specified powerplant is a Volkswagen air-cooled engine. The design load factor is 3.8 g, with an ultimate load of 5.7 g.

The CX4 first flew in 2004. As of April, 2017, there were 55 flying CX4s in Australia, Brazil, Canada, New Zealand, South Africa, and the United States.


General characteristics

Crew: one

Capacity: one passenger

Length: 18 ft 3 in (5.56 m)

Wingspan: 24 ft (7.3 m)

Height: 4 ft 8 in (1.42 m)

Wing area: 84 sq ft (7.8 m2)

Empty weight: 520 lb (236 kg)

Gross weight: 850 lb (386 kg)

Fuel capacity: 10.5 gal (39.7L)[citation needed]

Powerplant: 1 × Volkswagen horizontally opposed, automotive conversion piston engine, 65 hp (48 kW)

Propellers: single blade



Cruise speed: 109 kn; 201 km/h (125 mph)

Stall speed: 35 kn; 64 km/h (40 mph)

Never exceed speed: 135 kn; 249 km/h (155 mph)

Service ceiling: 10,000 ft (3,000 m)

Rate of climb: 825 ft/min (4.19 m/s)