Training & Rules j70-boat-handling Class Office & Rules J70 Class Rules 2026 Association FAQ Speed Guides / Tuning Guides Every sailmaker has their tips on how to go fast. North Sails J/70 SPEED GUIDE J/70 TUNING GUIDE Doyle Sails J/70 Tuning Matrix: Southern Spar Mast Sites to purchase J70 Parts Harken J/70 Deck Layout Vela Sailing Supply West Coast Sailing