The Hawker Duiker, J6918, at Brooklands
The Hawker Duiker, J6918, at Brooklands with the small diameter wheels initially fitted.
The Hawker Duiker was designed by the newly-formed H.G. Hawker Engineering Co Ltd against Specification 7/22, which called for a plethora of capabilities including gunnery-spotting, unit liaison and 'terrain surveillance'. All of these were covered under the collective heading of 'Corps Reconnaissance Duties' and a contract for three aircraft was issued to Hawker in February 1922.
Unusual for its time in being an all-wood parasol monoplane, the Hawker Duiker (named after a small sub-Saharan antelope) was conceived by the company’s new Chief Designer Captain B. Thomson as an all-wood two-seater, which could be fitted with either a Bristol Jupiter or an Armstrong-Siddeley Jaguar engine.
The Duiker’s monoplane wing was swept back and of rather thin section in the centre. The trailing edge (above the tandem cockpits) was cut away to provide the pilot and his observer with a good view in all directions. The wings were braced by a pair of struts on each side and the undercarriage was another unusual feature, in that it was of very wide track and with no axle connecting the wheels.
The prototype Hawker Duiker was completed in the first half of 1923, and was given an RAF serial (J6918). It was subsequently fitted with a 430 hp nine-cylinder, air-cooled Bristol Jupiter IV radial engine and first flew at Brooklands in July of that year, in the hands of renowned test pilot F.P. Raynham.
At the end of 1923, the sole Hawker Duiker was sent to the Aeroplane & Armament Experimental Establishment (A&AEE) at Martlesham Heath, Suffolk for an evaluation of its military capabilities.
After comparatively little flying however, it was determined by the A&AEE pilots that the Hawker Duiker suffered from severe aileron flutter (dangerous vibrations within the wing control surfaces) and had substantial stability problems. It was also declared overweight, presented poor maintenance attributes. 
Therefore, it was not further tested at its design gross weight and it was deemed more prudent to remove no less than 240 lb of military equipment before conducting trials.
Hawker Duiker head on
The Duiker’s wide-track undercarriage reduced the risk of the aircraft overturning while taxying.
Although a contract had been issued for three examples, this was cancelled after the prototype’s further evaluation at the Royal Aircraft Establishment (RAE) at Farnborough in 1924, where it had shown similar results to those at Martlesham Heath.
The two further examples were not built although work had been started on a second prototype, which was subsequently reported as 'buried in a corner of Brooklands'.
Having accrued barely 18 flying hours, the Hawker Duiker was withdrawn and scrapped. 
That said it still retains its honourable position as the first aircraft design to be completed and flown by the newly-formed HG Hawker Engineering Co Ltd.

Variants & Numbers

Single prototype only (J6918)


Powerplant                            One 430 hp nine-cylinder Bristol Jupiter IV radial engine
Span 48ft 5in
Maximum weight 4,940lb, but limited to 4,700 lb for trials
Capacity and armament Pilot and observer; provisions for a fixed-forward firing Vickers gun and a defensive Lewis gun. Removed for trials due to restricted performance
Maximum speed 125 mph at sea level
Cruising speed 99 mph
Endurance Up to 3.75 hr or 345 miles range at 95 mph



Other information

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