I ran into this thread too and thought I would mention ,.. If you move the prop from the back to the front , face it the same way and turn it the same way it will do the same thing...Standing facing the plane if the prop is turning counter clockwise with the airfoil leading edge forward , you just take the prop and move it forward , turn it the same direction face it the same way and it will do exactly the same thing...The prop dosent know if it is pulling or pushing but turning it backwards will be like when your motor sometimes starts and runs backwards .. It will , not fly apart but it won't create much pull or push either ..