De Havilland
DH65 Hound

The DH65 Hound was a private venture design for a DH9A replacement.
De Havilland DH65 Hound prototype DH65 Hound G-EBNJ as initially flown with Napier Lion VII engine
The De Havilland 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.
It was delivered to the RAF for evaluation in January 1928 recieving a designation of J9127 and although the type’s flight performance was assessed as good, it was effectively ruled out by its wooden construction. 
Its maximum speed of some 160 mph made it faster than contemporary RAF fighter aircraft.
De Havilland DH65A Hound G-EBNJ flying De Havilland DH65A Hound G-EBNJ flying, showing the revised shape of the rudder.
Prior to 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.
De Havilland DH65A Hound G-EBNJ ground De Havilland DH65A Hound G-EBNJ on the ground with engine running.
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.
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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