Hurel-Dubois Miles HDM.105

HDM.105
	f2
Type:	Transport plane
Design country:	United Kingdom of France;
Manufacturer:	HD et M. (Aviation), Ltd
First flight:	March 31, 1957
Number of pieces:	1

The Hurel-Dubois Miles HDM.105 was a transport aircraft with very elongated wings for research purposes, the development of which was based on findings from the development of the Hurel-Dubois HD.10 and represented an important step towards the planned construction of the HDM.106 Caravan. The development of the HDM.105 / HDM.106 formed the starting point for the construction of the Short Skyvan .

development and construction

The French aircraft designer Maurice Hurel was an advocate of wings with very high aspect ratios to reduce the induced drag, similar to that of the "Davis wing" of the Consolidated B-24 Liberator , but with a far greater aspect ratio. After testing his profile design with the tiny Hurel-Dubois HD.10 , Hurel wanted to continue his development with a large transport aircraft. In a joint venture between Miles Aircraft and Société de construction des avions Hurel-Dubois , a Miles Aerovan was equipped with very high aspect ratios and subjected to comparative tests.

The HDM.105 used the fuselage , tail unit and engines of the Miles Aerovan with the registration G-AJOF, which was equipped with wings with a wingspan of 75.3 ft (22.95 m ) and an aspect ratio of 20.5. The wings with the NACA profile were supported by struts, which also had a profile and thus contributed to the lift . When rolling , the machine was steered by means of differential ailerons and spoilers . Since there was no space for the fuel in the slim wings, tanks for 13 gallons (60 liters) of fuel were housed in the support fairings of the landing gear .

use

The HDM.105 - initially with the registration G-35-3, later G-AHDM - completed its maiden flight controlled by IA Forbes on March 31, 1957. On June 28, 1958, it was irreparably damaged in an accident during the approach to Shoreham and then scrapped.

Versions

HDM.106 caravan

After the successful tests with the HDM.105, the company HD et M (Aviation) Ltd was founded for further development. The HDM.106 caravan was to be an all-metal aircraft with a mass of 8,000 lb (3,629 kg ) and a wingspan of 75 ft (23 m). Two Lycoming GO-480s with a nominal output of 290 PS (213 kW ), two Lycoming GSO-480B with 340 PS (250 kW) or two Turbomeca Astazou I with 320 PS (235 kW) were provided for the drive . But the development never got beyond the drawing board .

The construction of the HDM.106 was sold to the Short Brothers , who developed the very successful Short Skyvan from it , but whose wings have a far lower aspect ratio of 11.

HDM.107 Aerojeep

Military version of the HDM.106 with STOL properties for the US Army , powered by two Lycoming T53 turboprop engines with 800 PS (588 kW).

HDM.108

Enlarged version of the HDM.106 from Hurel-Dubois.

Miles M.111

Draft of a lighter, single-engine transport version with wings and struts of the HDM.105, powered by a Turbomeca Astazou turbo-prop engine with 320 HP (235 kW).

Technical specifications

Parameter	Data
crew	2
Passengers	9
length	34.33 ft (10.46 m )
span	75.33 ft (22.96 m)
height	13.9 ft (4.24 m)
Wing area	277 ft² (26 m² ) (wing only) 390 ft² (36 m²) (including struts)
Wing extension	20.5
Empty mass	3,219 lb (1,460 kg )
Max. Takeoff mass	6,170 lb (2,799 kg)
Cruising speed	116 mph (187 km / h )
Top speed	79 mph (127 km / h)
Service ceiling	16,200 ft (4,938 m)
Engines	2 × four-cylinder in-line engines Blackburn Cirrus Major III with 155 PS (114 kW )

Individual evidence

↑ CM Lambert: Foretaste of the Caravan HDM.105 Handling and HDM.106 Prospects . In: Flight and Aircraft Engineer . tape 73 , no. 2576 . Flight Publishing Co, London June 6, 1958, p. 776-777 (English).
^ Don L. Brown: The Miles mini-freighter . In: Airplane Monthly June 1975, p. 276
↑ ^a ^b ^c ^d ^e ^f Don L. Brown: Miles Aircraft since 1925 . 1st edition. Putnam & Company Ltd, London 1970, ISBN 0-370-00127-3 , pp. 354-357 (English).
^ Leonard Bridgman (Ed.): Jane's All the World's Aircraft 1958-59 . Jane's All the World's Aircraft Publishing Co. Ltd., London 1957, p. 95.96 (English).

[Flight060658p776-1] CM Lambert: Foretaste of the Caravan HDM.105 Handling and HDM.106 Prospects . In: Flight and Aircraft Engineer . tape 73 , no. 2576 . Flight Publishing Co, London June 6, 1958, p. 776-777 (English).

[2] Don L. Brown: The Miles mini-freighter . In: Airplane Monthly June 1975, p. 276

[Brown-3] ↑ ^a ^b ^c ^d ^e ^f Don L. Brown: Miles Aircraft since 1925 . 1st edition. Putnam & Company Ltd, London 1970, ISBN 0-370-00127-3 , pp. 354-357 (English).

[JAWA58-59-4] Leonard Bridgman (Ed.): Jane's All the World's Aircraft 1958-59 . Jane's All the World's Aircraft Publishing Co. Ltd., London 1957, p. 95.96 (English).