De Havilland DH65 Hound prototype
DH65 Hound G-EBNJ as initially flown with Napier Lion VII engine
The De Havilland Aircraft Company DH65 Hound was a two-seat, two-bay general purpose biplane of wooden construction, powered by a 530 hp Napier Lion VII engine.
The first prototype (G-EBNJ) flew on 17th November 1926 and the type was offered as a private venture against Specification 12/26 for a general purpose or light bomber design of all-metal construction to replace the DH9A.
Prior to its official trials, the Lion VII engine was replaced with a 540 hp Lion XA, with a change in designation to DH65A, flying for the first time on 27th February 1927.
In this form, metal wing spars were incorporated, together with an underslung radiator, which improved the lines of the nose. The rudder was also modified in shape and the interplane struts were faired to minimise drag.
It was delivered to the RAF for evaluation in January 1928, recieving a military serial (J9127). The flight performance was assessed as good and its maximum speed of some 160 mph made it faster than contemporary RAF fighter aircraft.
However, the use of various metals and composites was becoming more favoured between the wars and so it was effectively ruled out due to its predominantly wooden construction.
De Havilland DH65A Hound G-EBNJ flying
De Havilland DH65A Hound G-EBNJ flying, showing the revised shape of the rudder.
Despite its rejection by the authorities, on 26th April 1928 the DH65A (re-engined with a Lion XI) set a world load carrying record for with a load of 2,205lbs (1,000kg) over 62 miles (100 km) at a speed of 162.28 mph. Records were also set for 500 km with either 1,000 kg or 500 kg load, both at 158.66 mph.
De Havilland DH65A Hound G-EBNJ ground
De Havilland DH65A Hound G-EBNJ on the ground with engine running.
Subsequently, a modified derivative of mixed wood and metal construction and powered by a 520 hp Bristol Jupiter VIIIF radial was built for the Australian government as the DH65J. This aircraft featured a modified undercarriage and ailerons on all four wings.
Sadly, the DH65J showed inferior performance to the earlier wooden DH65 and with no orders forthcoming the planned second DH65 aircraft (G-EBNK) were not completed.
De Havilland DH65J Hound II ground of South African demonstrator ZS-ARE
The sole Jupiter VIII-powered DH65J Hound II on the ground. This aircraft carried no registration or serial.


A further project to develop the type saw it as a four-seat passenger aircraft, designated the DH74 although it never came to fruition.



  DH65 DH65A DH65J
Powerplant 530 hp Napier Lion VIII 540 hp Napier Lion XA 520 hp Bristol Jupiter VIIIF
Span 45 ft 0 in
Maximum Weight 4,603 lb 4,640 lb 4,979 lb
Capacity & Armament Pilot and rear gunner positions; provisions for 460 lb bomb load and forward firing synchronised Vickers machine gun and single Lewis gun for self-defence on a low drag DH mounting. 
Maximum Speed   161mph at 5,000ft 125mph at 5,000ft
Range     1,000 miles



DH65 Hound G-EBNJ as initially flown with Napier Lion VII                       
DH65A G-EBNJ re-engined with Napier Lion XA or Lion XI 
DH65J Hound II Second modified aircraft fitted with Bristol Jupiter VIIIF



No DH65 airframes survive. 


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