With the recent mention of the radial engine project going on down under, you start to wonder what the guys building radial engine customs have been up to. The guys at JRL Cycles, who have now put together a number of bikes around the 9 cylinder Rotec radials, are working on several projects, including an 18 cylinder two row version which should be quite a sight.
While prowling around their image gallery, I spotted the drawing above, a 7 cylinder radial engine sport bike. Is this something they’re thinking about building? Considering the size of the Rotec, the 7 cylinder is only about an inch and a half less in diameter than the 9, it seems unlikely unless there’s another smaller engine available and unless air flow could be managed very well it would lead to some cooling issues, but at least someone is thinking about it and it shows possibilities beyond the stretched customs we’ve seen so far. Interesting.
Link: JRL Cycles
UPDATE: Kim Scholer sent in this photo he took of a Verdal radial engine motorcycle at the Sammy Miller museum. It’s a 750cc 5 cylinder single speed board racer. Thanks, Kim!