International 420

Product catalog summary

Overview: This document is a tuning guide for the International 420 sailing boat, specifically for the Superspar M7 mast and Nautivela hull. It provides detailed settings for various wind conditions to optimize performance.

Specifications:

Jib Wire Tension: 22-24 Loose PT-1
Shroud Cable Tension: 29-31 Loose PT-1
Spreaders Length: Not specified

Settings by Wind Speed:

0-8 knots:
- Mast Rake: 6.13 cm
- Mast Prebend: 42 mm
- Shroud Tension: 31
- Mast Step: 41.5 cm
- Chocks: 0 to 1.5 cm from neutral
9-13 knots:
- Mast Rake: 6.09 cm
- Mast Prebend: 40 mm
- Shroud Tension: 31
- Mast Step: 41.5 cm
- Chocks: 1 to 2 cm from neutral
14-18 knots:
- Mast Rake: 6.04 cm
- Mast Prebend: 38 mm
- Shroud Tension: 30
- Mast Step: 42.5 cm
- Chocks: 1.5 to 0.5 cm from neutral
19-23 knots:
- Mast Rake: 6.00 cm
- Mast Prebend: 42 mm
- Shroud Tension: 30
- Mast Step: 42.5 cm
- Chocks: 0.5 to 0 cm from neutral
≥ 24 knots:
- Mast Rake: 5.98 cm
- Mast Prebend: 45 mm
- Shroud Tension: 29
- Mast Step: 43.5 cm
- Chocks: 0 cm to -0.5 cm from neutral

Additional Information:

Base setting for Superspar M7 - Nautivela: 470mm-475mm
3mm dyform cable is used for both jib and shroud cables.
Zaoli Sails One Design: More information can be found at zaolisails.com/onedesign

Catalog excerpts

Tuning guide for International 420 - 2011 Base setting for Superspar M7 - Nautivela Jib wire tension Shroud cable tension Spreaders length SETTINGS Mast rake Mast prebend Shroud tension Mast step Chocks (from neutral) Zaoli Sails One design 22-24 Loose PT-1 29-31 Loose PT-1 470mm-475mm 3mm dyform cable. 3mm dyform cable. 0-8 knts 9-13 knts 14-18 knts 19-23 knts ≥ 24 knts 6,13 cm 42 mm 31 41,5 cm 0 to 1,5 cm 6,09 cm 40 mm 31 41,5cm 1 to 2 cm 6,04 cm 38 mm 30 42,5 cm 1,5 to 0,5 cm 6,00 cm 42 mm 30 42,5 cm 0,5 to 0 cm 5,98 cm 45 mm 29 43,5 cm 0 cm to - 0,5 zaolisails.com/onedesign

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