Tailwind was a motorcycle attachment produced in 1952, and built by a Mr A. Latta, of Berkhamstead in Hertfordshire.
This was a 49cc two-stroke engine that fitted above the front wheel of a bicycle, which it drove by friction roller. An unusual feature was that that the engine had two speeds, achieved by fitting a two-diameter drive roller and a means of shifting the complete assembly sideways to select the ratios.
Although it worked well, the moped era was fast approaching, so it never reached production.
Sources of Information
The British Motorcycle Directory - Over 1,100 Marques from 1888 - by Roy Bacon and Ken Hallworth. Pub: The Crowood Press 2004 ISBN 1 86126 674 X