J/109 TUNING GUIDE
Base Settings
- Rake – Swing Arc – Use jib halyard pulled down to top of black band on mast – swing fwd to mark headstay.
- Rake – Distance from mark on headstay to deck at stem: 2230 mm
- Cap Shroud Tension: #60 on RT-10 Loos Gauge
- D1 Tension: #40 on RT-10 Loos Gauge
- D2 Tension: #25 on RT-10 Loos Gauge
- J Dimension: Measured from stem to Fwd face of mast: 4050mm
- Mast Base: Measured from Fwd face of mast to bulkhead: 460 mm
- Pre-Bend: without mainsail hoisted: 20mm
Sail Models
Jibs
- 0-14 TWS: LM-2 Light-Medium Jib
- 12-25 TWS: MH-2 Medium-Heavy Jib
Spinnakers
- 0-20 TWS: A2-4 AP Spinnaker
- 18-25 TWS: 4A Heavy Spinnaker
Quick Adjustments
Turns from Base Settings
Speed Guide
Check out our J/109 Speed Guide for race‑proven guidance on rig tune, sail trim, crew positioning, and boathandling—all tailored specifically to the J/109. It provides clear, repeatable cues that help teams sail more consistently, make smarter adjustments on the water, and maximize boatspeed in all conditions.
