Local Rating
Typically, you would need a rating assigned by a local PHRF group in the area in which you intend to race. That said, I looked up all listed Hunter 30's in the current PHRF list of the Chesapeake Bay and they show:219 rating for two Hunter 30's, shoal draft, folding prop, roller furling above the deck, one with 130% headsail and one with a 135% headsail189 rating for Hunter 30-2, wing keel, roller furling below deck, 155% headsail.A 30 seconds per mile difference would make it worth your while to get an accurate rating thru the local PHRF rather than guess.