RE: Plane for OS25 SF?
You could always try something like the herr engineering 1/2 a planes, but you REALLY have to beef them up, they are made for small engines but it can be done, I had thier 1/2 A texan with an OPS .21 in it and it would scream, but like I said, you'll have to beef it up, A LOT! Something like the House of balsa planes could work too.