Big,I've been reading this thread and do believe you whole heartly believe your own testing. I think I found a flaw in your thinking. You said"vanes are able to maintain there speed because of less friction and wind resistance to maintain speed and rpms to stableize the arrow. " Thats where we differ in thinking. In my thinking Speed/rpms have nothing to do with stablizing the arrow. The fletching length and profile is what stablizes the arrow. Feathers grab more of the air (which may slow down the arrow) then vanes which take controll and stear the arrow from the rear faster then vanes. The bigger the profile the better the controll. I haven't shot vanes in 10 yrs. or so but I notice the newer vanes have a rough surface or a little raised dipple on the edge. In my thinking they are trying to grab more air for stablizing. Feathers are more forgiving with contact then vanes. Thats been my thinking for yrs. Right or wrong it's worked well for me. Jerry