The Adams-Wilson Hobbycopter (later named the Choppy) is a tiny single-seat open-framework helicopter designed for home-building, to be powered by a motorcycle engine. Plans were first marketed in 1958 and have been revised and revived by various designers many times over the years.

Specifications (Choppy, typical)

General Characteristics

• Crew: one pilot
• Length: 15 ft 0 in (4.57 m)
• Main rotor diameter: 21 ft 6 in (6.55 m)
• Height: 6 ft 0 in (1.83 m)
• Main rotor area: 363 ft² (34 m²)
• Empty: 300 lb (136 kg)
• Loaded: 600 lb (183 kg)
• Maximum takeoff: lb ( kg)
• Powerplant: various - typically a 2-stroke motorcycle engine

Performance

• Maximum speed: 85 mph (136 km/h)
• Range: miles ( km)
• Service ceiling: 8,500 ft (2,590 m)
• Rate of climb: 950 ft/min (290 m/min)
• Main rotor loading: 1.7 lb/ft² (5.3 kg/m²)
• Power/Mass: varies

Related content

Related development: A-B Helicopters A/W 95 - Ben Showers Skytwister

Comparable aircraft:

Designation sequence: