Is there any actual difference between main blades for FBL vs. Flybar? I keep seeing blades selling as flybarless. I thought all 3d blades have symmetrical airfoils. Is the only difference stiffness? I put a pair of carbon blades on my old Trex clone with flybar head, I assume that's okay. Also I've never seen any blades selling for flybar helis. So what up with this?