Speaking about engines, I bought a Magnum .91RFS while they were cheap( I payed 130 for mine through tower with promo code). At 4700 feet I finaly found the Engine for this plane WOW!! add a 14x6 Xoar Insant thrills. Had no problems with cg just had to reposition blind nuts a half of a hole wider. Also put 2 dowels on wing instead of one in the center. I've just found this thread and thought i would add my $0.02.