Hafner A.R.III Gyroplane
# Hafner A.R.III Gyroplane

The Hafner A.R.III Gyroplane was a British 1930s experimental autogyro designed by Austrian Raoul Hafner, and built by the A.R.III Construction Company at Denham, Buckinghamshire.

## Design and development

The single-seat Gyroplane had a three-blade auto-rotating rotor fitted above the fuselage on a strutted plyon. A 90 hp (67 kW) Pobjoy Niagara radial piston engine was mounted on the fuselage nose. It had fixed tailwheel landing gear and the rear fuselage included a large dorsal fin to provide directional stability. An unusual feature was the control system which was equipped with spider-actuated cyclic and collective pitch control of the rotor blades; this mechanism, a variant of the swashplate-actuated rotor control, became a standard feature on helicopters. In 1935, the Gyroplane was manufactured at the Martin-Baker Aircraft Company's factory at Denham, Buckinghamshire. In autumn 1935, the Gyroplane, registered G-ADMV, first flew at Heston Aerodrome, piloted by V.H. Baker. On 6 February 1937, it flew at Hanworth Air Park, having been modified as the Mark 2 version. It was tested at Farnborough, and leased to the Royal Aircraft Establishment for research, but it was scrapped during the second world war. A two-seat A.R.IV and three-seat A.R.V were planned, but construction was stopped when Hafner was interned under Defence Regulation 18B.

## Variants

### A.R.III

    Prototype single-seat autogyro powered by a Pobjoy Niagara radial piston engine.

### A.R.IV

    Experimental rotorcraft to meet Air Ministry Specification S.22/38. Powered by a 210hp de Havilland Gipsy Six II engine, construction was started by Short Brothers as the Fleet Spotter, but was stopped in May 1940 when Hafner was interned.

### A.R.V

    Experimental rotorcraft to meet Air Ministry Specification S.22/38. Powered by a 210hp de Havilland Gipsy Six II engine, construction was started by Short Brothers as the Night Shadower, but was stopped in May 1940 when Hafner was interned.

## Specifications

Data fromBritish Civil Aircraft since 1919 Volume

General characteristics

* Crew: one
* Length: 17 ft 10 in (5.44 m)
* Empty weight: 640 lb (290 kg)
* Gross weight: 900 lb (408 kg)
* Powerplant: 1 × Pobjoy Niagara , 90 hp (67 kW)
* Main rotor diameter: 32 ft 10 in (10.00 m)

Performance

* Maximum speed: 120 mph (190 km/h, 100 kn)
