Five and three quarters sounds about right. I had one with a Magnum 52 4 stroker and it wasn't a real hotrod vertically but the 4 stroke pulled good and it was a real hoot to fly. Good bang for the buck. I was messing around one day really low and got inverted flat spin and by time I recovered I barely missed the ground but not to worry..........the tree beyond the ground stopped it dead in its tracks! Oops! Hate it when I kill an innocent plane. OS 46 should power it nicely.