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Douglas Motorcycles was one of the most distinctive manufacturers in early British motorcycling history. Founded in Bristol, England, the company became famous for producing motorcycles powered by horizontally opposed twin-cylinder engines, commonly known as flat-twin or boxer engines.
Douglas motorcycles appeared in the early years of the twentieth century and quickly gained a reputation for smooth engine operation and mechanical reliability. The flat-twin engine layout provided a lower center of gravity and improved balance compared with many upright single-cylinder motorcycles of the same era.
This reference guide provides an overview of historic Douglas motorcycle models including production years, engine specifications, and historical context. The page is intended to help collectors and enthusiasts identify and understand the motorcycles produced by the Douglas Engineering Company.
| Model | Production Years | Engine Type | Capacity | Category |
|---|---|---|---|---|
| Douglas Model A | 1907-1909 | Flat twin | 350cc | Early road |
| Douglas Model B | 1910-1914 | Flat twin | 350cc | Road |
| Douglas 2-3/4 HP | 1914-1918 | Flat twin | 350cc | Military / Road |
| Douglas EW | 1925-1932 | Flat twin | 350cc | Road |
| Douglas SW Series | 1932-1939 | Flat twin | 500cc | Sport / Touring |
| Douglas Dragonfly | 1955-1957 | Flat twin | 350cc | Road |
Production Years: 1907-1909
Engine Type: horizontally opposed flat twin
Displacement: approximately 350cc
Drive: belt drive
Cooling: air-cooled
The Douglas Model A was one of the earliest motorcycles produced by the Douglas Engineering Company. Designed around a horizontally opposed twin-cylinder engine, the motorcycle offered smoother operation than many single-cylinder motorcycles of the same period.
The flat-twin configuration later became widely associated with manufacturers such as BMW, but Douglas had already been using this layout many years earlier.
Production Years: 1910-1914
Engine Type: flat twin
Displacement: 350cc
The Model B represented a refinement of the earlier Douglas design. Improved engine reliability and stronger frames made these motorcycles more practical for everyday road use.
Production Years: 1914-1918
Engine Type: flat twin
Displacement: 350cc
During the First World War many Douglas motorcycles were used for military dispatch riding. Their smooth engines and relatively low center of gravity made them suitable for long-distance riding under difficult conditions.
Production Years: 1925-1932
Engine Type: flat twin
Displacement: 350cc
The Douglas EW was one of the company's most successful motorcycles during the 1920s. It featured improved frame construction and a refined engine design.
During this period Douglas motorcycles achieved several racing successes in European competitions, helping the company gain international recognition.
Production Years: 1932-1939
Engine Type: flat twin
Displacement: 500cc
The SW series represented a larger and more powerful generation of Douglas motorcycles designed for both sporting use and long-distance touring.
Production Years: 1955-1957
Engine Type: flat twin
Displacement: 350cc
The Douglas Dragonfly was one of the final motorcycles produced by the company. It featured a modernized design with improved suspension and styling compared with earlier Douglas models.
Despite these improvements, the British motorcycle industry faced increasing competition from international manufacturers during the 1950s, which made it difficult for smaller companies such as Douglas to remain competitive.
Although Douglas never achieved the production scale of larger British manufacturers such as BSA or Triumph, the company remains historically important for its early use of the flat-twin engine configuration.
Douglas motorcycles are now highly valued by collectors, particularly the early machines that helped pioneer the horizontally opposed engine layout in motorcycling.
Douglas is a historic British motorcycle manufacturer and is featured in our guides to British vintage motorcycle brands as well as our complete overview of vintage motorcycle manufacturers by country, covering major global motorcycle industries from 1900 to 1980.
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