J/109 Tuning Guide | North Sails
Posted on July 10th, 2019
North Sails RESOURCES
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-1 Light-Medium Jib
- 12-25 TWS: MH-1 Medium-Heavy Jib
Spinnakers
- 0-20 TWS: A2-3 AP Spinnaker
- 18-25 TWS: 4A Heavy Spinnaker
Quick Adjustments
Turns from Base Settings
TRUE WIND SPEED | SAIL SELECTION | CAP SHROUDS | D1s | D2s |
Light (0-10 TWS) | LM-1 / 2A | Minus 4 | Minus 1 | Minus 1.5 |
Medium (10-16 TWS) | LM-1 / MH-1 / 2A | Base (60) | Base (40) | BAse (25) |
Heavy (16-20 TWS) | MH-1 / 2A | Plus 5 | Plus 2 | Plus 1.5 |