Tuning without a Tuning Guide

BASE Measurements

Target Speeds by Mode
Port/ Outer
Port/ Inner
Stbrd/ Inner
Stbrd/ Outer
69 mm
38 mm
42 mm
80 mm
BASE:   Outer - 19   I   Inner - 9   I   1.75" Pre-bend   I   Forestay  56-1/2"
Disp
Wing
Lazy Plane
Planing
0 - 10 Kts
8 - 14 Kts
10-15 Kts
15+ Kts

N/S Tuning Guide

Add true measurements and update turns

All-Purpose Jib Trim

Heavy-Air Jib Trim

J/70 Polar Diagram

Corrective Measure for Improving Point

In Overpowered Mode, and not pointing
1. Primary Item: Forestay Too Loose
  • Tighten Shrouds
  • Specifically, inner/lower shrouds to tighten the forestay
 
2. Follow-up
  • More effective Backstay with tighter forestay, with better main shape
  • Lessen heel at all costs - flat is fast and will gain point through speed
    • Heavy Wind (15 deg max, 12-15 goal)
    • Moderate Wind (9-12 max, flatter the better)
    • Light Wind (6-9 deg max)
    • Ultra-light, <6 kts, encourage heel (12 deg)
    • Keep air from getting under the stern
  • Travel drop in heavy to 1 car above center and sheet Main hard
    • Active main to keep boat at consistent heel - not through driving
 
3. Order of depowering
  • Modulate Main Sheet trim in wind conditions - Trim hard to FLAT
  • Outhaul, tighten until extremely high.  Jib ad Main foot match shpe
  • Vang - ease
  • Cunningham
  • Traveler
 
4. Jib
  • Inhaul less on J2+
  • Set leeward as much as inside 2 stripe. 
  • Preset leeward for Close Haul setting and banjo off deck for added trim