De Havilland D.H.93 Don
1937
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De Havilland D.H.93 Don

The de Havilland Gipsy Twelve engine installed originally in the D.H.91 Albatross was renamed Gipsy King for military use and selected to power a multi-role trainer designed to Air Ministry Specification T.6/36. This de Havilland D.H.93 Don was of wooden stressed-skin construction and was intended for use as a pilot, radio and gunnery trainer. The prototype was flown on 18 June 1937 and following manufacturer's initial trials, during the course of which small auxiliary fins were fitted beneath the tailplane, the aircraft was transferred to Martlesham Heath for official evaluation. Required modifications resulted in increased weight, and heavy equipment (including the turret) had to be removed. Of the original order for 250 Dons only 50 airframes were completed; of this total 20 were delivered as engineless airframes and the remainder converted for communications duties with No. 24 Squadron and a number of station Flights.

De Havilland D.H.93 Don


Specification 
 MODELD.H.93
 ENGINE1 x de Havilland Gipsy King 1 inline piston engine, 391kW
 WEIGHTS
    Take-off weight3112 kg6861 lb
    Empty weight2291 kg5051 lb
 DIMENSIONS
    Wingspan14.48 m48 ft 6 in
    Length11.38 m37 ft 4 in
    Height2.87 m9 ft 5 in
    Wing area28.24 m2303.97 sq ft
 PERFORMANCE
    Max. speed304 km/h189 mph
    Ceiling7100 m23300 ft
    Range1432 km890 miles

3-View 
De Havilland D.H.93 DonA three-view drawing (700 x 605)

Comments
Graham Brett, 31.01.2015

can you help with which Station Flight held L2413, as it was last seen at Elsham Wolds in 1940 parked tail up.I am researching the circumstances of the incident.
Kind regards from Lincolnshire
Graham Brett

John Daniell, 04.03.2010

D. Llewellyn, this engine, the same as used in the Albatross was air cooled, the air entering the wing intake, then being turned 180 degrees to enter the engine from the rear. A retractable flapped exit underneath was adjustable to maintain engine temperature.

John Holt, 31.07.2009

Don Station flts;
L2390 - RAF Grantham
L2392 - RAF Eastchurch
L2393 - RAF Eastchurch
L2395 - RAF Andover
L2396 - RAF Wyton
L2398 - RAF Mildenhall
L2399 - RAF Andover
L2400 = RAF Abingdon
L2401 - RAF Andover
L2403 - RAF Northolt

D. Llewellyn, 30.05.2007

The most interesting aspect of this aircraft was the engine cooling intakes, which are in the wing leading edges and use (I understand) conical diffusers to optimise the pressure recovery. I would like to know more about this system (e.g. diffuser area ratio, inlet radius, angle) and how well it performed.

M.R.Slater, 21.12.2006

Where was first flight undertaken. Hatfield ?
What station flights were issued, where and when.
One of the mystery RAF aircraft.

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