That adjustable Tuttle system is essentially the same as what I came up with roughly 15 years ago when I was designing my Tandem 'Slalom' sailboard. I knew it needed an adjustable fin box to trim the board properly after building previous tandem speed boards, so I drew up the adjustable Tuttle design with a longer box using spacer inserts. I discussed it with Mathew back then, but we didn't get around to building the Tandem board, at least, we have not yet.😏
Then when Anthony Perkins built his Tandem speed board, I discussed with him my view that it would benefit greatly from an adjustable Tuttle box, and described my design. Anthony subsequently built a beautiful version with locking pins for the spacers, which I had not thought of. He has made a video showing and describing it. Very nice work indeed. 😎
As to the pros and cons of using and adjustable Tuttle box in foil boards, I have no idea whatsoever! 😀
Edit. I am of course referring to the Adjustable Tuttle box being made by Tuttlebox.com.
The Radix one is very different and it more like a huge US box with T-nuts instead of plates.
I think if I was to build my Slalom Tandem now, I might prefer that design as it has far more fore-aft adjustability, but then I would not be able to use existing Tuttle fins. 🤔
