RE: big stik 40 underpowered?
I flew the same plane with an OS 40FP for years. I am not familiar with your engine, but it should have way more power than the 40FP. Check your incidence or use a little more nitro. A .46 of any kind should fly that plane nice. It's a fantastic plane. I got 1000 flights out of my first one. Should be fun.