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
TRUE WIND SPEED | SAIL SELECTION | CAP SHROUDS | D1s | D2s |
Very Light (0-8 TWS) | LM-2 | -5 turns | -2 turns | -2 turns |
Light (9-12 TWS) | LM-2 | -2 turns | -1 turn | -1 turn |
BASE – Medium (12-16 TWS) | LM-2 or MH-2 | Loos 60 | Loos 40 | Loos 25 |
Heavy (17+ TWS) | MH-2 | +5 turns | +2 turns | +1.5 turns |