I keep being asked:
How long / heavy is actually …….?
Can you translate the class rules ...?
The difficulty with our boat class is that we are a construction class.
There is the formula (L + 2d - F + square root (S)) / 2,37. The result must be a number that must not be greater than 2,4. The rest of the class rule is - in addition to administrative rules - mainly a collection of secondary conditions that the values in the formula must adhere to.
To put it simply:
It is clear that there are a multitude of combinations of L, d, and S that result in 2,4. Many fall out because there is no floatable boat overall, and the rest have to adhere to the principles described in the class rule.
Therefore, a designer who wants to register his design with the international class must present a model. Effective dimensions can then be determined there.
You have all seen that Jan ten Hoeve starts with a Norlin MK III and a Södergren MK IV. Both boats are different in detail, but both are 2.4mR.
The question mentioned at the beginning must therefore be: "How long / heavy is a Norlin MK III ...?"
It is best to follow the information given in the measurement log ... Except for the boat weight. With old boats (approx. Before 2000) the value is wrong and must be corrected to 254.
What does the interested sailor do if he wants to rebuild something, but usually stay? Or just when he wants to check if it's true?
A few years ago, the OD (One Design) rule was drawn up for the NORLIN MK III. The background was the requirement of the IPC to have the sports equipment comparable (quasi standardized). Quasi standardized because, of course, adaptations to disabilities had to be possible.
At its core, the OD standard is nothing more than a restriction on building tolerances. But it contains a lot of dimensions with max. and minimum specifications. If you test your boat against the OD standard, you are definitely correct. Of course, that doesn't mean that “just outside” is no longer 2.4-capable. Some things are regulated in the OD standard that are not specified in the 2.4 regulation.
But you have a few values that are correct in every case.
In the explanations in the following articles, reference is therefore often made to the OD rule, even though I know that most boats do not have or are striving for an OD certificate.
One more thing: The statements in all articles, including those to come, always refer to NORLIN MK III, unless otherwise stated, as these make up 90% of the boats.
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