Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 140,242 pages of information and 227,382 images on early companies, their products and the people who designed and built them.
By 1931 Douglas had become a public company and was sold by the family.
1932 New models were added, but the firm was soon in financial difficulty.
1932 The light air-cooled engine had been adapted for use in light aircraft by British Aircraft Co.
1934 They produced a 494cc shaft-drive model called the Endeavour. William Douglas, by now quite elderly, bought back the faltering business and produced a smaller range until the end of the decade.
1935 The company was in financial trouble and was voluntarily liquidated. The factory was purchased by the British Pacific Trust. It had been used for making motorcycles and light aero engines. The new owners would use it for making aero engines and accessories. A new public company Aero Engines Ltd was launched which planned to halt production of motorcycles, concentrating instead on engines for aircraft.