Yeah, if you build the Four Star 60 in it's stock out of the box form, it's fairly tame. Shorten each wing by 1 bay, add 1.5 inches of length to the rudder, sheet the turtledeck, and put a .91 or 1.00 Four stroke on it, and it is FAR from tame. Mine doesnt fly anywhere NEAR like a stock one flies. Apparently, Brit has never flown one that's been modified much!