| Highclere | |
|---|---|
 | |
| Role | Airliner |
| National origin | United Kingdom |
| Manufacturer | de Havilland Aircraft Co. Ltd. |
| First flight | 18 June 1925 |
| Retired | 1927 |
| Number built | 1 |
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 to use only multi-engined types.
The DH.54 Highclere [1] 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 nine to twelve, 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. [1]
Size apart, the wings of the Highclere differed [1] 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 rearrangement 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 inline engine which lengthened the nose and drove a four-bladed propeller of 14 ft (4.27 m) diameter. [1]
The Highclere was first flown by H.S. Broad on 18 June 1925 [2] and was soon carrying non-paying passengers and winning races. [1] Owned by the Air Ministry throughout its life, it went to RAF Martlesham Heath for successful airworthiness tests early in 1926, with the Certificate of Airworthiness awarded on 23 April 1926. By then, though Imperial Airways had decided no longer to transport passengers in single-engined types for safety reasons and the sole Highclere was transferred to RAE Farnborough on 7 March 1926 for experimental work. On 7 November 1926 [2] it was loaned to Imperial Airways at Croydon Airport as a freighter and some thought was given to modifications to make the Highclere better fitted to this role, [1] but it was destroyed when a hangar collapsed in heavy snow at Croydon on 1 February 1927.
Data from Jackson 1978, pp. 212
General characteristics
Performance
The de Havilland DH.95 Flamingo was a British twin-engined high-wing monoplane airliner first flown on 22 December 1938. During the Second World War some were used by the Royal Air Force (RAF) as a transport and general communications duties.
The de Havilland DH.114 Heron is a small propeller-driven British airliner that first flew on 10 May 1950. It was a development of the twin-engine de Havilland Dove, with a stretched fuselage and two more engines. It was designed as a rugged, conventional low-wing monoplane with tricycle undercarriage that could be used on regional and commuter routes. A total of 149 were built; it was also exported to about 30 countries. Herons later formed the basis for various conversions, such as the Riley Turbo Skyliner and the Saunders ST-27 and ST-28.
The Armstrong Whitworth Argosy was a three-engine biplane airliner designed and produced by the British aircraft manufacturer Armstrong Whitworth Aircraft. It was the company's first airliner.
The Vickers Vulcan was a British single-engine biplane airliner of the 1920s built by Vickers Limited at Brooklands Aerodrome, Surrey. It carried eight passengers and a pilot.
The DH.83 Fox Moth is a small biplane passenger aircraft from the 1930s powered by a single de Havilland Gipsy Major I inline inverted engine, manufactured by the de Havilland Aircraft Company.
The Avro Andover was a 1920s British military transport aircraft built by Avro for the Royal Air Force. Four aircraft were built, in two versions. Three aircraft, the Type 561, were used as flying ambulances. The sole example of the Type 563 was used as a 12-seater transport.
The de Havilland DH.90 Dragonfly is a 1930s British twin-engined luxury touring biplane built by the de Havilland Aircraft Company at Hatfield Aerodrome.
The de Havilland DH.50 was a 1920s British large single-engined biplane transport built by de Havilland at Stag Lane Aerodrome, Edgware, and licence-built in Australia, Belgium, and Czechoslovakia.
The de Havilland DH.66 Hercules was a British 1920s seven-passenger, trimotor airliner built by de Havilland Aircraft Company. With the Hercules, Imperial Airways took over responsibility for the airmail service from the Royal Air Force, which had been operating the obsolete Airco DH.10 Amiens.
The Airco DH.16 was an early British airliner designed by Geoffrey de Havilland, the chief designer at Airco. It accommodated a pilot plus four passengers, and was operated from 1919 to 1923.
The de Havilland DH.29 Doncaster was a British long-range high-wing monoplane of the 1920s built by de Havilland.
The de Havilland DH.18 was a single-engined British biplane transport aircraft of the 1920s built by de Havilland.
The de Havilland DH.34 was a single engined British biplane airliner built by the de Havilland Aircraft Company in the 1920s. 12 were built, with the DH.34 serving with Imperial Airways and its predecessors for several years.
The Bristol Ten-seater and Bristol Brandon were British single-engine biplane transport aircraft built by the Bristol Aeroplane Company in the early 1920s. Only three were built, two of which were used as civil transports and one of which served with the Royal Air Force.
The de Havilland DH.51 is a 1920s British three-seat touring biplane built by de Havilland at Stag Lane Aerodrome, Edgware.
The de Havilland DH.75 Hawk Moth was a 1920s British four-seat cabin monoplane built by de Havilland at Stag Lane Aerodrome, Edgware.
The Airco DH.3 was a British bomber aircraft of the First World War. The DH.3 was designed in 1916 as a long-range day bomber by Geoffrey de Havilland, chief designer at the Aircraft Manufacturing Company. It was a large biplane with wide-span three-bay wings, slender fuselage, and a curved rudder. It was powered by two 120 hp (89 kW) Beardmore engines, mounted as pushers between the wings. In addition to tailskid landing gear, two wheels were placed under the nose to prevent it from tipping over on the nose.
The de Havilland DH.71 Tiger Moth was a British single-seat monoplane, designed to research high-speed flight and to test replacement engines for the Cirrus. Only two were built.
The de Havilland DH.56 Hyena was a prototype British army cooperation aircraft of the 1920s. A single-engined biplane, the Hyena was designed against an RAF requirement, but was unsuccessful with only two being built, the Armstrong Whitworth Atlas being preferred.
The de Havilland DH.72 was a large British three-engined biplane bomber, designed as a Vickers Virginia replacement. It did not go into production.
