Avro 642 Eighteen

Avro 642 Eighteen
Name	Avro 642 Eighteen
Type	Light airliner
Manufacturer	Avro (company)
Designer	Roy Chadwick
First flight	1929

Avro 642 Eighteen was a British single-engined biplane airliner built by Avro (company) in 1929 to serve regional routes in the United Kingdom and British Empire. Designed during a period of rapid expansion in civil aviation, it aimed to compete with contemporary types such as the De Havilland Dragon and Handley Page W.8 by offering a relatively large cabin for up to 8–10 passengers. The type saw limited commercial use and modification before being withdrawn as Royal Air Force and civilian needs evolved in the 1930s.

Design and development

The Eighteen was conceived by Roy Chadwick at Avro (company) and assembled at the Avro factory, Manchester to meet specifications propagated by emerging carriers including Imperial Airways and independent operators like British Airways Ltd (1930–1932). Influenced by earlier Avro designs such as the Avro 618 Ten and Avro Anson (civilian predecessor), the aircraft combined a wooden fuselage with fabric-covered wings and a roomy enclosed cabin influenced by the De Havilland Flamingo concept and contemporary designs from Fokker and Junkers. Power was provided by a single Rolls-Royce Kestrel or similar engine, reflecting trends set by Rolls-Royce developments such as the Rolls-Royce Eagle and Rolls-Royce Falcon. Structural design drew on biplane practices seen in the Bristol F.2 Fighter and anti-aircraft requirements influencing airliner robustness in the late 1920s.

Operational history

After first flight in 1929 the three built airframes entered service with small regional operators and experimental routes operated by Imperial Airways and independent carriers including Hillman's Airways and Maidstone and District. The aircraft participated in trials alongside types like the de Havilland DH.83 Fox Moth and the Handley Page H.P.42 on routes linking London with Paris, Amsterdam, Cork, and other points across the British Isles and Continental Europe. Some examples were impressed into military service with units related to the Royal Air Force during later reallocation of civil types and were evaluated by organizations such as the Air Ministry and the Civil Aviation Department predecessors. Operational limitations, competition from multi-engined designs like the Douglas DC-2 and regulatory shifts after incidents involving Leyland Motors-operated types reduced its commercial appeal.

Variants

Several minor variants were developed or proposed during its short programme, reflecting operator requests similar to those influencing variants of the Avro 618 Ten and Handley Page W.10: standard cabin airliner models for passenger carriage, mail-configured versions for services akin to those run by British Postal Airways, and experimental conversions considered by Armstrong Whitworth and private firms. Proposals included engine alterations referencing installations such as the Napier Lion and later repowering with inline engines comparable to the Gipsy Major used in other contemporary conversions. Few variants progressed beyond proposal stage owing to limited production.

Operators

Operators included several British and colonial entities: Imperial Airways used one for evaluation and limited services, independent carriers such as Hillman's Airways and Whitehall Securities subsidiaries operated examples on feeder routes, and a small number were evaluated by Royal Air Force units and civil departments in the Dominion of Canada and Australia through affiliated companies. Occasional private owners in the United Kingdom and South Africa acquired airframes for executive transport and charter work similar to conversions seen with de Havilland types.

Specifications

General characteristics and performance were in line with late-1920s single-engined biplane airliners such as the de Havilland Dragonfly and Vickers Victoria: an enclosed cabin accommodating 8–10 passengers, wooden and fabric construction, fixed undercarriage, and powered typically by a Rolls-Royce Kestrel or equivalent producing several hundred horsepower. Performance metrics placed cruise speed and range between contemporaries like the Avro 618 Ten and the Handley Page H.P.42, suitable for short to medium regional sectors.

Surviving aircraft and legacy

No intact Eighteen airframes survive in major collections such as the Royal Air Force Museum, the Science Museum, London, or the National Aerospace Centre (UK), and remnants, drawings, and components are held in private archives and specialist collections associated with Aviation Preservation Society groups and enthusiasts linked to Brooklands Museum and the Imperial War Museum. The Eighteen's legacy persists in scholarship on the interwar civil aviation expansion alongside studies of the Avro 601 Buzzard and the evolution of Britsh airliner design influencing later types such as the Avro Lancaster through design lineage and personnel movement including figures like Roy Chadwick.

Category:Avro aircraft Category:1920s British airliners