International Moth

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North Sails has been working with the mast builders to try and get some standard numbers in terms of hounds and spreader positions for new rigs supplied moving forward. Be aware that not all of the older masts are the same length and might have different hound and spreader positions. Below is the information that you will need to be able to trim an old mast accordingly when ordering a new sail.

The Vi-8 mainsail is designed for a mast of MINIMUM length 5270 mm (it can be longer). Most CST and C-tech masts are 5300 mm.
Hounds position range is 1775-1975 mm
Spreader position range is 3475-3675 mm

The Vi-9DSX, Vi-9DSXR, Bi-9DSX & Bi-9DSXR are designed for 5100 mm masts and 60 mm mast stumps.
Hounds position range is 1700-1900 mm
Spreader position range is 3390-3450 mm.

Note: all measurements points are measured down from the top of the mast.

The foot length measured from the front of sleeve to center of the clew ring, is approx 2350-2380 mm on all sails. Some older booms maybe shorter than the current standard supplied booms. For booms that are shorter than the 2380 mm, North Sails recommends that those booms be extended to fit the latest sails.

Mainsails

International Moth Bi-9DSXR 3Di Mainsail

Decksweeper | Mast Length: 5000mm

The Bi-9DSXR Decksweeper 3Di Mainsail is a reduced sail area version of the Bi-9DSX for the Beiker designed International Moth. This sail can be used by any sailor when it gets windy for reduced upwind drag or by lighter sailors as an all-purpose sail across the wind range. This sail is recommended for mast length 5000mm and standard 260mm mast...

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International Moth Bi-9DSX 3Di Mainsail

Decksweeper | Mast Length: 5000mm

The Bi-9DSX Decksweeper 3Di Mainsail is an all-purpose, maximum sail area sail for the Beiker designed International Moth. This sail is recommended for mast length 5000mm and standard 260mm mast stump. Maximum luff length and careful distribution of shape and luff curve have produced a fantastic, easy-to-use Decksweeping sail for both upwind and downwind sailing. The sail is built using...

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International Moth Vi-9DSXR 3Di Mainsail

Decksweeper | Mast Length 5100mm

The Vi-9DSXR Decksweeper 3Di Mainsail is a reduced sail area version of the Vi-9DSX for the majority of International Moth designs including the Exocet, Mach 2, Rocket and others. This sail can be used by any sailor when it gets windy for reduced upwind drag or by lighter sailors as an all-purpose sail across the wind range. It is recommended...

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International Moth Vi-9DSX 3Di Mainsail

Decksweeper | Mast Length 5100mm

The Vi-9DSX Decksweeper 3Di Mainsail is an all-purpose, maximum sail area sail for the majority of International Moth designs including the Exocet, Mach 2, Rocket and others. This sail is recommended for mast length 5100mm and standard 60mm mast stump. Maximum luff length and careful distribution of shape and luff curve have produced a fantastic, easy-to-use Deck sweeping sail for...

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Moth 3Di Mainsail

International Moth Vi-8 3Di Mainsail

Standard Rig | Mast Length 5270mm

The Vi-8 3Di Mainsail is an all purpose sail for the Moth. Recommended for mast length 5270mm. Careful distribution of shape and luff curve have produced a fantastic, easy-to-use sail for both upwind and downwind sailing. The sail is built using North Sails 3Di technology.

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International Moth Class Experts

International Moth headshot

Rob Greenhalgh

Sydney, Australia
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International Moth headshot

Michal Korneszczuk

Gdansk, Poland
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International Moth headshot

Ruairidh Scott

Gosport, United Kingdom
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International Moth headshot

Riccardo de Felice

Carasco, Italy
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International Moth headshot

Bror With

Oslo, Norway
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International Moth headshot

Billy Sykes

Sydney, Australia
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