If you allow .5 oz sail cloth into the one design rules, I would expect the handicappers nationwide to review the rating, and probably hit the boat with an ODR rating change.
Let's make a fact based call on this rather than hypothesize. Each person in different PHRF areas, please contact your PHRF committee and ask if allowing the J/30 to utilize a 0.5 ounce spinnaker would change the rating.
The answer provided by
PHRF-NB is no change in rating for a change in sail cloth, only for change in sail dimensions.
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