Latest IACA Hydrofoil Rules

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Attention USACA Members: Below is the highly anticipated first action from Stefano Sirri, IACA president, on the controversial subject of hydrofoils.


Dear Presidents,

Following up the decision taken during our last WGM in Sanguinet, a commission has investigated the hydrofoil matter. A special thanks to all people involved for the time spent to work on this issue.It has been a free and open discussion with the following conclusions:

1. The technical committee has found that it is impossible to define “what a hydrofoil is”.

2. However it is much easier to describe what affects hydrofoils can have on an A Cat and therefore limit their use.Simply we don’t want foils to lift

the boat. Canted daggerboards and rudders may do this, so let’s limit their use and in so doing we will stop any further use of hydrofoils.

3. Moreover, grandfathering a big number of existing boats with canted daggerboards is not a viable option

4. To control this we wish to introduce a simple rule for a clear period, until the end of 2007, just to observe the situation and understand something

more (Box rule + 1,5 m underwater)

5. We also suggest to go on with group discussion. The hydrofoil group my be delegate to discuss the subject and to give warning signal to IACA Committee if and when things really are getting out of hand.
Measurement control

The extreme beam shall not be more than: 2.3 metres (7 ft 6½ inches)

The beam shall be measured at right angles to the centre line of the craft at the widest point and including all fixed or adjustable apparatus with the exception of a normally accepted trapeze or retractable seat. (adjustable apparatus such as foils must be measured both completely down and completely up flush with the bottom of the hull). In addition, no part of each hull or the respective fixed or adjustable apparatus shall come closer together than 1.5 metres below the static waterline. If necessary the static water line shall be found by floating the boat fully equipped without the sailor on board.

This rule has been approved by the IACA Commitee and will take effect immediately after it will be published on IACA Official Website

Hydrofoil Illustration

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