PHRF of the Chesapeake
If you Google PHRF of the Chesapeake and look at their current listings, there are two Hunter 31's listed:On Page 10 of 15: PHRF 183; Hunter 31 Shoal Draft Folding Prop, 154% GenoaOn Page 13 0f 15: PHRF 180: Hunter 31 Folding Prop, Roller furler Above deck, 155% Genoa (I'd asume this is adeep keel version).I think these are mid 1980's boats since they seem about right against my 1986 Hunter 28.5 Deep Keel, folding prop, 155% Genoa rating of 174.If you are going to race PHRF on the Bay, you should join US Sailing and apply for a certificate. If you just want to try your luck against the fleet first, there are a number of races that have a non spinnaker cruising division and I don't believe you need to join anything or get a certificate. Check in with your local club and they can get you started either way.Don't assume a Hunter can't be competative either. We've kicked some serrious butt with our 28.5 over the years but she has a racing bottom , folding prop, Headfoil and Mylar 155 Genoa for light air. Good Luck out there!