Some additional points: (1) sail material change is a proxy; the rating hit also applies to any deviation from OD rules. (2) -9 spm came by email from PHRF-MA; when I read their bylaws, I come up with -6 (I think our OD #1 is >170). (3) PHRF-MA maintains the PHRF base rating should be 141 even though they've issued no certificates. The purpose of the heavy hits, they say, is to discourage OD owners from deviating from their respective class rules. Their advice... "you don't want to go there."
