Gregg, I believe its just one of those topics where terminology Americanism/Britism dont compute. If you read the posts I have put on this thread I dont think we disagree on anything except the gap between you and the ground. I cannot spk for piston drivers, never been one and I also think the FTGs or the FCUs, depending on types or both make a difference. Continue enjoying but be sure nobody is trying to pull down Nick, quite the opposite his threads are very informative, always food for thought. His last animation even got me talking to ETPS again.