Thanks to all who took the time to reply. I appreciate it – it all helps.
As I understand it this is the engine that started it all – however its inefficiency somewhat limits its scope.
Nonetheless one can't help but wonder if a multi cylinder version is possible or perhaps it could be harnessed to enable one of those horseless carriage contraptions that are all the rage.
I could/should tackle it from first principles but laziness whispered that a kit would be a quick fix. I think I will have a ferret through my junk box and see what might be possible. If anything promising emerges I might report back.
Regards.
Frank C.