Cub .14 - now, THAT brings back memories
When I was really getting into the sport in the mid 50s, I got one for a birthday present and built a Jr Ringmaster for it.
Many flights, lots of fun. Back then, I used mostly Power Props and probably an 8-4 on the Cub.
As I recall, the Cub .14 and .19 were just upsized .049s.
Bob Z.