I have had T-foils on this foiled A-cat in my thumbnail for 9 years- With kick up Hobie rudder system. Works fine. I added a small line and a kickup cleat to the tiller to hold them down.

Dacarls:
A-class USA 196, USA 21, H18, H16
"Nothing that's any good works by itself. You got to make the damn thing work"- Thomas Edison