I doubt about the 2% benefit of a wing mast.
I never found the exact source for this theory either. There was some discussion on it "a long time ago" and half qualified information but no proper testing. Discussion touched topics like attaching flow after stalling, separation bubble on windward side, the need to trim mastrotation more while sailing as the wing is not as forgiving etc etc.
I do know the common thinking now is that the wingmasts are about 2% faster even if I know of no proper testing done on beachcats in real life. Hopefully somebody did this testing both under controlled conditions and real sailing conditions.
Self-tacker: Buy a straight track, go to a smith with a machine to bend metal.
Or if you have more time than money, build it in composites.
Rudders, boards: I can take a measure next Saturday, if you want. I can give you sections which I have developed for Tornado rudders as well, however they are thicker than standard section (yet have less drag), so you may need custom rudder heads. Rudders and boards shoud either have a high density core (as wood on Tornados) or spars to avoid core-crushing. If not you need significant skin thickness of CFRP. I think that the cheapest and yet light way to do is to have a wood core (CNC machined from a good carpenter shop) covered with glass fibre (you may add Aramid on the leading and tralning edge).
Very interested! DAG profile?
CNC shops willing to machine a mould, blanks or cores are not everywhere. Phils foils are well known but if you have other references, I am very interested.
PS:Buying used is a very good move! All my boatbuilding experience tells me so
