The International One Metre (IOM) is an international radio sailing development class: designers are free to choose the hull shape, but dimensions, weight and rigs are limited by the class rules, so races are decided mainly by the skipper's skill.
Key figures (Class Rules 2022)
- Maximum hull length: 1,000 mm.
- Draft: 370–420 mm.
- Minimum dry weight: 4,000 g.
- Up to three rigs to suit the wind.
- Radio control of rudder and sails.
The full rules are in the Documents section.
Getting started
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Last updated: 02/10/2026