de Havilland DH.86 Express - RC Groups
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Mar 10, 2014, 02:09 PM
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de Havilland DH.86 Express


from wikipedia
The de Havilland Express, also known as the de Havilland DH.86, was a four-engined passenger aircraft manufactured by the de Havilland Aircraft Company between 1934 and 1937.

The DH.86 was conceptually a four-engined enlargement of the successful de Havilland Dragon, but of more streamlined appearance with tapered wings and extensive use of metal fairings around struts and undercarriage. The most powerful engine made by de Havilland, the new 200 hp (149 kW) Gipsy Six, was selected. For long-range work the aircraft was to carry a single pilot in the streamlined nose, with a wireless operator behind. Maximum seating for ten passengers was provided in the long-range type, however the short-range Holyman aircraft were fitted with twelve seats.

The prototype D.H.86 first flew on 14 January 1934, but the Qantas representative Lester Brain immediately rejected the single pilot layout because he anticipated pilot fatigue over long stretches, and the fuselage was promptly redesigned with a dual-pilot nose. Only four examples of the single-pilot D.H.86 were built, and of these the prototype was rebuilt as the dual-pilot prototype. When she entered service in October 1934 the first production aircraft, Holymans' single-pilot D.H.86 Miss Hobart, was the fastest British-built passenger aircraft operating anywhere in the world. Despite de Havilland's predictions to the contrary, the dual pilot type with its lengthened nose proved to be even faster.

Investigations in 1936 following a series of fatal crashes resulted in late production aircraft being built with additional fin area in the shape of vertical "Zulu Shield" extensions to the tail planes to improve lateral stability - these aircraft were designated D.H.86B.

General characteristics

Crew: Two (pilot and co-pilot)
Capacity: 10-12 passengers
Length: 46 ft 1 in (14.04 m)
Wingspan: 64 ft 6 in (19.66 m)
Height: 13 ft 0 in (3.96 m)
Wing area: 641 ft (59.6 m)
Empty weight: 6,140 lb (2,791 kg)
Loaded weight: 10,250 lb (4,659 kg)
Powerplant: 4 de Havilland Gipsy Six I inline engine, 200 hp (149 kW) each

Performance

Maximum speed: 166 mph (144 knots, 267 km/h)
Cruise speed: 142 mph (123 knots, 229 km/h)
Range: 760 mi (661 nmi, 1,223 km)
Service ceiling: 17,400 ft (5,300 m)
Rate of climb: 925 ft/min (4.7 m/s)


"Single Pilot" nose






"Dual Pilot" nose





Last edited by TedD60; Mar 11, 2014 at 05:51 PM.
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