Hey Carl

I believe I said for the Tybee use

F20 Class. Set at the max dimensions of the I20.
expect few boats other then I20's.

HT20 Class using an HT rule that builders have yet to agree upon or one created by the Tybee organizors. This class would suck up the M20, Eagle 20 etc etc and run boat for boat as well.

FYI... Texel now uses 2 ratings... essentially a low wind and a high wind rating.