Ok I finally finished my TF P-51 .. I flew it yesterday... I used the stock US 41 engine and could not believe how much power that inexpensive engine has ... I am please with its performance..ok I finsished it as in it was ready to fly ... I still have yet to put all the scale stuff on like machine guns wheel covers etc.. I wanted to seehow it would fly ! ... by the way mine came out way nose heavy