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International Moth

The following sails are our current recommended range. Older models not listed below are still available upon request.

3DL Mainsail (V-7) NEW !

2015 European Champion

The all new V-7 3DL Mainsail is an all purpose Moth sail. 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 3DL technology in a mixture of Carbon and aramid which results in the strongest, smoothest and lightest Moth sail we have ever built. Internal batten pockets provide perfect symmetry from tack to tack and custom made curved carbon fiber camber inducers mean the flow around the leeward side of the sail attaches easily while providing a further weight saving.

Mainsail standard features:

  • Painted class insignia
  • Sail numbers
  • Carbon fiber curved Camber inducers
  • Internal batten pockets for perfect symmetry between tacks
  • Epoxy battens
  • Carbon battens upgrade available
  • Tell tales
  • Long roll bag
  • Available for kinked booms [between 10 and 20 degrees] and straight booms
For prices and more information contact our Int'l Moth Experts or your

Mainsail (H-14)

The H-14 is a development of the H-13.  Minor changes to the luff curve and finishing details have improved the sail allowing the Camber inducers to fully rotate.

Mainsail standard features:

  • Class insignia
  • Sail numbers
  • Camber inducers
  • Battens
  • Tell tales
  • Long roll bag
For prices and more information contact our Int'l Moth Experts or your

Mainsail (H-14 Exocet)

The H-14 Exocet uses the same design shape and finishing details as the H-14 but slightly altered geometry for the Exocet Moths with no King posts.

Mainsail standard features:

  • Class insignia
  • Sail numbers
  • Camber inducers
  • Battens
  • Tell tales
  • Long roll bag
For prices and more information contact our Int'l Moth Experts or your

Upwind technique

  • More vang improves VMG upwind.  With a 16:1 you should need moderate tension once up and foiling and very tight tension upwind once fully powered up.
  • Less vang is better for speed, i.e. when trying to get to one side of the course or for getting through another boat.
  • Once fully powered up, i.e. TWS greater than 14-15kts max vang.
  • Downhaul should be fairly loose in marginal conditions, as the TWS increases the downhaul should be pulled until you can sail with a full sail.  If your weather tell tales are luffing then you need more downhaul, if your leeward tell tales are luffing ease the downhaul.
  • Once fully overpowered upwind max downhaul and vang as hard as you can pull.
  • Outhaul about 150mm off boom in light winds and 100mm in breeze, never tighter than 100mm.
  • Shroud tension tighter for power, looser if overpowered, typically leeward shroud just loose.
  • Flat to slight heel to weather in light wind to power rig up as much as possible.  More heel to weather as the windspeed increases.  Heel to weather more for high mode and flatter for fast mode.  Keep in mind that more heel reduces the apparent wind angle and the effective sail area.
  • Ride height as high as possible without rudder ventilating.

Downwind technique

  • Outhaul eased LOTS.  Probably foot of the sail 200-250mm from boom, 8mm bungee wrapped around leech helps the outhaul ease, as does Ultra High Molecular Weight Plastic Tape under your boom and large clew tie lines or a Velcro strap.
  • Vang cracked, but not too much.  Just enough to make gybing easier seems about right.
  • C-Ham eased till there are just wrinkles on luff in light wind, a little less in breeze.
  • When heating up for speed add a little more downhaul especially if fully powered up.
  • Hike when enough pressure to hike against and still feel good apparent wind pressure, but don't make it a priority to hike unless you can hike hard to increase speed and carry the building apparent windspeed down to a similar angle as a non-hiking angle.
  • Heel is flat in most wind conditions, but slight to weather once hiking hard
  • Ride height as high as one dares depending on the windspeed

Taking a page from big boat racing, a good set of targets can be helpful.  I am using this as my starting point.  Obviously a good guess is required on the approximate windspeed.  Downwind Speeds are a little more approximate, maybe the top guys are a few knots quicker downwind as the breeze increases:

 Upwind Targets  Downwind Targets
 Windspeed Boatspeed  Windspeed Boatspeed
 8 10.5      8 12.00
 10 13.00  10 14.5
 12 14.3  12 17.00
 14 15.1  14 19.00
 16 15.5  16 20.5
 20 15.8  20 22.00
 24 16.00  24 24.00

Please visit Chris William’s Blog for the latest developments in the North Moth range.

Good Luck on the Water!

Sail Numbers & Letters

300mm (12”) Sail Letters & Numbers

Please contact your local North Loft or Agent to make your order or for further details.

Contact the International Moth Experts:
Ruairidh Scott
+44 (0)1329 443 430 Work
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