Open-source parts for the International Moth

Keep every Moth flying.

Designs, build instructions and CAD files shared by sailors, for sailors. Click a component on the boat to browse its parts.

Hover or tap a component

Latest parts

Repair or prevention for a worn-out tiller

Fittings to easily mount your ratchet block

Launch your Mach 2 moth on a ramp

Store your boom safely on your boat

Since 1928

The Moth class dates back to 1928 in Australia; it has been a development class ever since.

240 boats

The 2017 Moth World Championship on Lake Garda had a record fleet of 240 boats from 25 countries.

2.25 m

Every International Moth must fit within a maximum beam of 2.25 m, wings included.

3.355 m

The maximum hull length of a Moth is 3.355 m (11 ft) - small boat, big speed.

Wand

Most Moths control ride height with a mechanical wand at the bow that moves a flap on the main foil.

8.25 m²

Sail area is limited to 8.25 m², so every extra knot has to come from design and skill.

165 boats

The 2015 Moth Worlds in Sorrento attracted 165 entries - a record at the time.