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Confused by the grandfathering of the spinnakers? Lets clear this up
Back in 2005 Central Council released the following notice: 
To all Member Handicappers & Owners, On Saturday April 2, 2005, Central Council passed a motion to change the maximum penalties for the Genoa and Spinnaker, effective January 1, 2006. The maximum allowable luff perpendicular without penalty on a genoa will be 155% of J. Currently 153%. The maximum allowable mid-girth, without penalty, on a spinnaker will be 180% of J. Currently 183%. Any spinnaker built before January 1, 2006 is grandfathered for the life of the sail. Intrinsic in this motion is the understanding that all spinnaker and genoa penalty parameters will be adjusted accordingly. 
In 2005 (and prior) the table of Adjustments for a Spinnaker was as follows: Flying Sails adjustments are tabulated as follows | NOMINAL SIZE G % | SIZE RANGE | ADJUSTMENT (seconds/nautical mile) | CODE (2nd digit) | | 315 | over 303.1 | -24 | x | | 300 | 288.1 - 303 | -24 | k | | 285 | 273.1 - 288 | -21 | j | | 270 | 258.1 - 273 | -18 | i | | 255 | 243.1 - 258 | -15 | h | | 240 | 228.1 - 243 | -12 | 9 | | 225 | 213.1 - 228 | -9 | 8 | | 210 | 198.1 - 213 | -6 | 7 | | 195 | 183.1 - 198 | -3 | 6 | | 180 | 168.1 - 183 | 0 | 5 | | 165 | 153.1 - 168 | +3 | 4 | | 150 | 138.1 - 153 | +6 | 3 | | 135 | 123.1 - 138 | +9 | 2 | | 120 | up to 123 | +12 | 1 | In 2006 the table of Adjustments for a Spinnaker was changed as follows: Flying Sails adjustments are tabulated as follows: | NOMINAL SIZE G % | SIZE RANGE | ADJUSTMENT (seconds/nautical mile) | CODE (2nd digit) | | 315 | over 300.1 | -24 | x | | 300 | 285.1 - 300 | -24 | k | | 285 | 270.1 - 285 | -21 | j | | 270 | 255.1 - 270 | -18 | i | | 255 | 240.1 - 255 | -15 | h | | 240 | 225.1 - 240 | -12 | 9 | | 225 | 210.1 - 225 | -9 | 8 | | 210 | 195.1 - 210 | -6 | 7 | | 195 | 180.1 - 195 | -3 | 6 | | 180 | 165.1 - 180 | 0 | 5 | | 165 | 150.1 - 165 | +3 | 4 | | 150 | 135.1 - 150 | +6 | 3 | | 135 | 120.1 - 135 | +9 | 2 | | 120 | up to 120 | +12 | 1 | What was recognized is that there would be boats that would now be penalized by 3 sec/nm (where they were not previous to 2006) due to this change because the size of their sails fell within the following size ranges: 120.1 – 123
| 210.1 – 213 | | 135.1 – 138 | 225.1 – 228 | | 150.1 – 153 | 240.1 – 243 | | 165.1 – 168 | 255.1 – 258 | | 180.1 – 183 | 270.1 – 273 | | 195.1 – 198 | 285.1 – 288 |
The Grandfathering of the sails was to ensure that we were not penalizing boats for the changes that we made. Therefore, the grandfather credit was enacted. How this works: Boat A has a certificate with a spinnaker G% of 212.0%.
Boat B has a certificate with a spinnaker G% of 186.0%
Both boats sails were built prior to 2006. According to the 2005 Table of Adjustments: Boat A received a -6 sec/nm adjustment due to the size of its sails.
Boat B received a -3 sec/nm adjustment due to the size of its sails. According to the NEW 2006 Table of Adjustments: Boat A will now receive a -9 sec/nm adjustment due to the size of its sails.
Boat B continues to receive a -3 sec/nm adjustment due to the size of its sails. On the Certificate: Boat A would show that it receives a -9 sec/nm adjustment due to the size of its sails.
But would also note, that there was a +3 sec/nm Grandfather adjustment
Total Adjustment for the spinnaker is now back to -6 sec/nm. Boat B would continue to show a -3 sec/nm adjustment due to the size of its sails. 
A SPECIAL NOTE:
The grandfathering of a spinnaker is not applied to the spinnaker pole. Example: Boat B (as above) has a spinnaker pole that is oversized and due to the length, results in a G% of 196%. However, his actual spinnaker is 186.0% (as above). According to the 2005 Table of Adjustments: Boat B received a -3 sec/nm adjustment due to the size of its pole. According to the NEW 2006 Table of Adjustments: Boat B will now receive a -6 sec/nm adjustment due to the size pole. |
