Deduct for fixed 3-blade prop
Deduct for roller furling Genoa
Deduct for in-mast during main
Deduct for wing keel
the 310 starts in the 180s, but with the above goes to 210
In any case PHRF call is being completely redone. I submitted my form in early January and am still awaiting an answer (originally promised in April)
For PHRF Chesapeake bay, my 310 has a base rating of 171, and a 9 sec/mi credit for roller furler/drum above deck and 12 sec/mi for fixed 3 blade prop resulting in 192. The 310s range from 180 and 195 on the bay (three boats). A 309 WK rates 195. These are similar hulls to your 315, but a local rating could be different in your region. My original PHRF certificate did not reflect wing keel, but when I requested a change I got the same rating and WK added to the certificate. She is not really a race boat with a wing keel, but comfortable for beer can racing, and easily sailed with a small crew.