In the 12's, I know of several crews that have clocked over 24 knots (instantaneous). It could be even higher now.
At this top end, sea-state really comes into play with such a short WL
Strong breeze & flat(ish) water is the go for speed.
T-foils are one of the few restrictions in this development class. Currently they are not permitted (one of the several differences between 12’s and R-class skiffs)
A T-foil would change the optimum hull shape in a big way. Look at the changes in the i14 hulls when they went that way.
Development class so it depends on many variables (Preferred design, Pro-build Vs Amateur, access to moulds, local costs of carbon, sails, etc, etc)
As a (very rough) guideline; a completed Pro-build carbon Hull (raw/unpainted) with, Main fin, Rudder fin & Rudder box starts at around...
Clean, I am just teeing up the best contact for you regarding videos of AUS Nationals this Easter.
We can only hope for conditions like the Kiwis had for their Nationals a week or so ago.
I will PM you as soon as I have a contact details.
BTW - Phil is bang-on regarding the next...
If you are in QLD don't forget to check out the 12's Australian National Championships over Easter at RQYS.
Cherubs are invited to compete also.
The 75th Australian Titles
Royal Queensland Yacht Squadron
Heat 1 - Friday 2nd April
Heat 2 & 3 - Saturday 3rd April
Heat 4 & 5 - Sunday...
As the guys here will attest to, the size of crew does not old any water either.
Put in whichever rig suits you and the conditions for the day.
There are some pretty small physiques that have won the inters recently too.
So we all agree that there are no excuses!!!!