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De Havilland Highclere
The de Havilland DH.54 Highclere was a single-engined 15-passenger biplane airliner designed to replace the DH.34. Its development ended when Imperial Airways decided only to use multi-engined types.
==Development==
The DH.54 Highclere was designed to Air Ministry specification 40/22 for a larger version of the very successful DH.34 and the two aircraft had much in common, both in construction and general layout Compared with the DH.34, the Highclere's passenger complement increased from 9 to 12, its all up weight by 56% and its wing area by 70%. They were both single-engined two-bay biplanes with fabric covered wooden wings and with wooden framed fuselages covered with thin plywood.〔
Size apart, the wings of the Highclere differed〔 in having no stagger, no upper wing dihedral and in having a larger inter-wing gap, the upper wing now attached to the fuselage by cabane struts rather than directly to the upper fuselage. In response to criticism of the DH.34's high landing speed, full span flaps were fitted. To reduce the hazards of ditching, the undercarriage could be jettisoned and the fuselage was made watertight. Passengers sat in four rows of seats, singles on the left and doubles on the right. A re-arrangement of luggage space allowed room for toilets. The Highclere had balanced elevators. The weight increase required an increase in power, so the Highclere used a 650 hp (485 kW) Rolls-Royce Condor IIIA water-cooled in line engine which lengthened the nose and drove a four-bladed propeller of 14 ft (4.27 m) diameter.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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