5 Cylinder Radial

[Pete O]

Thanks for the explanation Brian, that all makes sense although being somewhat of a tactile person I think I would have to have some time with a cutaway model or perhaps a good animation before I could make any claim to understanding the geometrical issues involved. I spent the first decade of my working life- and a whole lot of my leisure hours since then- working with engines but have never had anything to do with radials so they are still something of a mystery to me (as type this there is a photo behind my computer of me in a SNJ5B- navy variant of the T6- with a big P&W radial at the business end, only thing I've ever had to do with one!).