K&B advertised, but never actually produced a ringed .29 engine. Lud Kading built two experimental engines in 1947, but it was decided that they wouldn’t go into production. These engines were marked “1-R” and “R29.” All parts except cylinder with webs and piston with rings are the same as the lapped Torpedo .29. (Excerpt from Tim Dannels’ American Model Engine Encyclopedia, page 127). Read Tim Dannels’ story about this engine in his Engine Collectors’ Journal, Volume 43-#4, Issue 250, June 2019.
K&B “Ringed Piston” Prototypes
