Appowner

Never said I had one. But if I did, I'd set it up as light as possible. The wing design is for a high speed wing to begin with. I don't recall the wing loading but I know it's high to start with. Bigger engines will increase the overall weight (especially using twin cylinders vice single) which raises the wing loading. More powerful engines will simply dig a deeper hole.

You're talking a 60 four stroke right now and that should be fine. Though I'd still look and the weight differences. But you were considering a 1.20 twin cylinder? That's just asking for trouble. But hey, it's your money!