Kingswood, Bristol.
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 Herr Kronfeld made a record flight from Croydon to Paris in an aircraft powered by a Douglas engine[1].
1935 The company was in financial trouble and was voluntarily liquidated. The factory was purchased by the British Pacific Trust[2]. 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.