I had an OS91 Surpass turning a 12X10 APC and loved it. A 46LA or any 46 size engine just is not going to have the power you need for this plane. A 60 size 2 stroke aor a 90 sized 4 stroke is more what you need

I got stupid with mine by getting to close to a stand of tress and we all know about those plane eating trees [X(]