De Havilland
DH75 Hawk Moth

A four-seat high wing monoplane intended for the private aircraft market.

De Havilland DH75 Hawk Moth prototype G-EBVV De Havilland DH75 Hawk Moth prototype G-EBVV with DH Ghost engine.
 
De Havilland Aircraft Company Technical Director Major Frank Halford's radical concept of mating two Gipsy I engines into a common crankcase, produced a 198 hp V-8 engine known nowadays as the DH Ghost. Once this was achieved the DH75 prototype (G-EBVV) was then designed around this new engine and it flew from Stag Lane for the first time on 7th December 1928.
 
Better known as the De Havilland DH75 Hawk Moth, it was a strut-braced, high-wing monoplane. It featured a welded steel fuselage with a somewhat ungainly undercarriage arrangement, reminiscent of that adopted by a number of similar American aircraft of the same period. The wing planform was very similar to that adopted for the later DH80 Puss Moth.
 
However, it was immediately apparent that the type was underpowered, so it was redesigned as the De Havilland DH75A which featured an increased wing span and chord, powered by the 240 hp Armstrong Siddeley Lynx engine.
 
De Havilland DH75A Hawk Moth G-CYVL Lynx-powered De Havilland DH75A Hawk Moth G-CYVL.
 
In December 1929, the aircraft was demonstrated in Canada, fitted with both wheel and ski undercarriages. It was also demonstrated with floats, which resulted in the Canadian Government ordering 3 aircraft. 
 
The first aircraft (actually the first DH 75 Hawk Moth) did not have portside doors, so it could not be fitted with floats, so it was utilised by the Canadian Controller of Aircraft. Whilst the second and third aircraft were cleared for use with floats, the restrictions on their payload made them unsuitable and they were fitted with either wheels or skis. 
 
Two aircraft were built and exported to Australia. Aviatrix Amy Johnson used one of these aircraft to fly from Brisbane to Sydney in 1930, after her more famous De Havilland DH60 Gipsy Moth 'Jason' sustained damage on landing in Darwin.
 
One De Havilland DH75A Hawk Moth was entered in the 1930 King’s Cup Air race, being placed seventh at an average speed of 126.2 mph.

 

De Havilland DH75B Hawk Moth The sole Wright-powered De Havilland DH75B Hawk Moth.
 
In an attempt to compete with U.S. built aircraft, a De Havilland DH75B hawk Moth was produced in May 1930, completed with a 300 hp Wright Whirlwind engine. Production of this variant did not commence and so this left 2 incomplete airframes.
 

In total, only eight aircraft were completed, comprising the prototype DH75, six DH75A and the single DH75B.

 

Variants & Number built


De Havilland DH75
Hawk Moth
One only G-EBYY with 198hp DH Ghost engine
De Havilland DH75A
Hawk Moth
Six aircraft, 240hp Armstrong Siddeley Lynx engine
De Havilland DH75B
Hawk Moth
One unregistered prototype, 300hp Wright Whirlwind engine

 

Specification


                                     DH75A Hawk Moth
Powerplant One 240 hp Armstrong Siddeley Lynx VIA seven cylinder radial engine
Span 47 ft 0 in
Maximum Weight 3,650 lb
Capacity  Pilot and three passengers.
Maximum Speed 127 mph
Cruising Speed 105 mph
Range 560 miles

 

Survivors


None
 

More information