Does sound a bit heavy at 8-10. Mine, with a Magnum 52 2 cycle came in at a little over 7#. That 52 pulls it just fine. Never had a long run and in head wind, lifts right up. The Magnum 52 has same bolt pattern as OS 46 so it just bolted right in. I also have the Cessna that is as much fun to fly, but do have to watch your speed when banking. Too slow and it will tip stall, snap roll.

I fixed the hinge problem by using alternate strips of clear packing tape. Got over 15 flights like that and not a hint of loosening. Its a great flier for as heavy as it is and quite aerobatic.