>From PHRF Chesapeake Standard Sail and Equipment Specifications: 7. Limitations of spinnakers
A. Spinnakers shall be sheeted from only one point on the sail. B. Battens shall not be used in spinnakers. C. Spinnaker Luff (SL) shall not exceed .95 times the square root of (I2 + J2) without penalty. D. Spinnaker Maximum Width (SMW) shall not exceed 1.8 times J without penalty. E. Adjustable leech lines are not permitted on spinnakers. F. Spinnaker pole length shall not exceed 100% of J without penalty. 8. Asymmetrical Spinnakers A. Choice of asymmetrical, symmetrical, or both types of spinnakers, shall be made at time of application or renewal and may be changed once during the sanctioned racing season. B. Unpenalized luff (ALU) shall be no greater than 1.1 times the square root of (Ia2 + (J * (SPL%/100))2) C. Unpenalized foot (AF) shall be no greater than (J * (SPL%/100) * 1.8). SPL% shall include extendible bowsprits. D. Unpenalized mid girth to foot ratio (AMG/AF) shall be not less than .75. Reading this I would surmise that SPL% is measured from tip of extended bowsprit to mast (in the manner SPL is measured at mast). Section 7F states that SPL% shall not exceed J without penalty. Therefore it is safe to assume that adding a sprit will incur a penalty based on the amount that the new SPL% is increased over J. If you boat is already rated with only an ASYM spinnaker then your rating will be affected adversely. If you are changing from a SYMMETRIC spin to an ASYM with pole there may be a credit for using ASYM over SYM offset by a penalty for oversized pole and spin.... Best to ask in advance. Mike ________________________________ From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of TOM VINCENT Sent: Monday, January 28, 2013 9:22 PM To: C&C Forum Subject: Stus-List PHRF rating change I have purchased a Sparcraft Bowsprit for my 36' C&C and was wondering if anyone knows what change will take place on my PHRF rating of 127. I race on the Bohemia River on the northern end of the Chesapeake Bay and use the Annapolis rating system. My spinnaker is an asymetrical. Tom Vincent Frolic II 36' C&C cb Chesapeake City, MD
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