you can only swing one way. that is unfair to every one that flys both planes sizes. some keep a few small one to keep up the skill so we don't kill every one in a 3 mile zone if we fall out of a hover when the engine quits or radio lock out. on a 55% if it ok on small its ok on big. thats why we have a flight box to keep it 25 away from bystanders. if the pilot wants to get closer its his life thats out there not yours. i hover close enough i have to wipe oil off my trans and arms. i under stand the risks that are there and i trust my self and every one i fly. with maybe thats why i hate dave[:@] brown so much i have never seen unsafe 3 d flown.i'm for the best ways to go for 3d flight and turbines i have no wavier don't plan to get one either. all will fly at about 150 to 180 but 1 and it should be around 250 or up i hope.