Thank you all for the input. I will check into the Thunder Tiger .46 as well. It sounds like I am on the right track with the O.S. though. How does the Thunder Tiger .46 compare to the O.S.? Is it as reliable? I will stay away fromeither the Magnum .52orlarger four stroke for now as there is a pretty substantial price difference between those and this is my first plane in 17+ years so there will be a huge relearning I am sure.</p>