Sorry didn’t think to post it as it was such an old thread.
The engine is a Stuart Turner WD (War Department) or Flat Twin Air Cooled as it is better known.
The Stuart Turner Flat Twin came into existence when the War Office approached Stuart Turner and seven other companies in 1923, for a light -weight generator set that could be carried into forward operating positions on the back of pack mules. The War Office set stringent criteria that needed to be fulfilled. Stuart Turner was asked to build two engines for trials. The engine that was produced was the only engine to perform as needed while adhering to the criteria. The engine which Stuart Turner designed and entered was a Small Flat Twin Side Valve air-cooled four stroke supplied with 300 Watt generator, oil pump fitted and the sump was sealed so that the engine would not be affected by which position it was carried in, and was extremely light in weight.
The brief was that the whole set should weigh no more than 84 lbs (38 kilos) as it was intended for forward radio positions in difficult terrain & would be carried on a pack mule. It must be unaffected by the position in which it was carried, be capable of operating in any temperature from freezing to 140oF and govern its speed to within 5%. There were other conditions too, but these are the salient details.
They produce 1HP at 1760RPM, so not the most powerful of things, I wouldn’t have thought the car would have been much of a speed machine!
At the moment there is 14 known, only about 2 are a complete set, most are engine only.
Im just after the Marconi Douglas to go with it
Cheers, Steve
