This S2 class page forum is not as active as it used to be, but there is still some useful info to be found here.
S2 9.1 Meter North American One Design Class Association
A 13-page PFD with the S2 History and Referral Info from Tiara
The Yanmar Diesel Engine Manual you may have onboard.
There aren't too many of these, and certainly current sites are next to impossible to find.
Lightning Rod Racing - the previous owner's blog