Yes I saw that Vertical fin in the back and all I could do was shake my head. but your right I aint gonna be screaming out of a 1/2 cuban eight with a half roll and a snap. So no need to worry about it I guess. And the TT Pro .61 is more for STOHL purposes than for top speed. I plan to use a 12x6 or 13x6 wide blade Graupner coming off the water or out of golf course first cut rough, that’s about what our grass field is like. Also I plan to tow some gliders if I can find anyone in our club to use as guinea pig. Thats what I meant by hard use. But let me get it airborne and go from there if I see things bending, flexing and flapping thats a different story.

Thanks

JDS