As many problems as this thing has.............It's darn fun. got the flywheel re-balanced, replaced screw in engine mount, and shot some video today, All in all, a good day! I talked to my neighbor, (who builds real airboats). he said " The large ones have your problem too, but it is usually the totally insane people who put 500 hp engines on 12 foot boats" he said my problem is that I'm just overpowered. I'll learn to live with it i guess here is the vids I shot today.[link]http://www.rc-airboats.com/gallery/view_album.php?set_albumName=new-quarter-scale[/link]