@ Mark Burns - I know it's somewhat off the subject but if you're using a whole bunch of rudder during formation flying, it's not the sort of advice you want to propagate on this site. I believe the side by side RV's do fly nicer with the smaller rudder but you don't want fly formation cross controlled i.e. with your feet. It's a dangerous corner to get into as you could find yourself, for example, cutting your engine with the wrong tank selected due to fuel starvation amongst other evils. Try to relax and put your feet on the floor. Formation should be flown in balanced flight. If you're slipping or skidding whilst flying formation, you're trying to get closer and keep your distance at the same time.