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Some history on the headsail and spin pole length from an old J/30 page...

The class legal number 1 is a 163% genoa. For a bit of history, here's how it came to be. When he sailed the prototype, Rod Johnstone felt the boat was slightly underpowered in light air conditions, so he specified a 163% genoa and a 1 foot longer than the J dimension spinnaker pole and spinnaker.