Can anyone tell me the optimum upwind and downwind VMG at 10 and 20 knots true wind speed? Also, the boatspeed at 10 and 20 knots TWS on a 90 degree reach (0.0 VMG)?
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You will find a VPP polar diagram for the J/30 on this site, under Frequently Asked Questions (accessible, for example, Under Official Specifications).