RE: Needed: a picture of a Piper Cub Dummy Engine
Call Great Planes and they can send you out the kit for the dummy engines. I don't know what the part number would be for the 1/6 scale but the one for the 60 size is CUB6001. This is a little bigger that the 1/5 scale almost a 1/4 scale 90" wingspan. They should work on the Sig Cub if they have the right size for it. Their phone number is 217-398-8970. Good Luck!
Gibbs