RE: Suggested Engine Size for Bi-plane
Hi ezurk1,
Hogflyer has given you excellent advice if you are a beginner?
If not and you have posted in this forum by mistake I would recommend the ST from the two choices you have identified however IMHO a 125A Saito or similar light powerful four stroke would be my choice. I'm biased as I am very happy with the 125A Saito in my Ultimate built from a Cg kit.
Cheers,
Colin