Thanks guys for the input. This is what makes the hobby interesting! And, no, I didn't know the tail plane needed to be nose heavy! For my part, a lot of the fun is in trying to replicate our particular 'favorite' aircraft into a miniature version. I use autopilots, and try any other gimick, to keep my planes 'reusable'. But while we're on the subject, what about L.E. flaps on a model jet, any thoughts on that one? I also fly some full scale occasionaly and use my simulator just to keep in practice. I've flown a Schweizer sailplane , Cessna 150 (with stabilator), Piper Cherokees and Flightstar U/L- all of which I think are easier to fly than any model I own-maybe 10 or 12. I have a couple of sims of the SU27 and took probably 35+ landing attempts to learn to fly it. But, again, the question I guess is to what degree control surfaces on full scale a/c can be usefully replicated with smaller versions at slower speeds