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Posted

Hi all

 

I am drawing out a new deck plan for an IOM project and want to explore the flat deck option to keep the rig low. Having built a number of the style with the conventional deck well I can see that the deck limits mark goes on the bottom of the kicker well. I want to do away with this and am wondering how to keep to rules and have a deck limits mark. Do I need to have a false deck inside the Hull whare the mark can be located. If I cut an opening 8n the main deck and measure down to the inner deck how different is this to normal well.  Opinions welcome !!!

Tom Roberts

Posted

These are my thoughts.

The deck is not a defined term in either the ERS nor the Class rules. So when it is used, it is taken as what is the normal usage or understanding.

My opinion is that the deck limit mark be placed on the (common understanding of) deck and not at the bottom of the mast well. The gooseneck well is accepted as part of the deck and it is normal to place the deck limit mark there.

It is well understood that if you want to try something new or unusual, to make a formal request through your class secretary to the IOMICA before expending much effort or resources.

There is an advantage in having the rig low to reduce healing forces, and the control points are the deck limit mark and the low point - which affects the boom height. But there are diminishing returns, as you go lower - the boom can drag in the water on close reaches, and you are in less wind (bottom of wind gradient) in lighter conditions.

John

John Ball

IOM CAN 307 (V8)

In my private capacity

Posted

I will quote probably the most important phrase in the Class Rules:

"The class rules for the International One Metre Class are closed class rules in which anything not specifically permitted by the class rules is prohibited. Individual rules may require, limit, or permit as necessary."

Larry

IOM &DF65 sailor

North Essex

Posted

One other consideration will be the effect of shortening the forestay with the rig being too low and being unable to get the jib to fit.  Sketch it out first and you will see. John and Trevor make valid points. 

Richard

Posted

Tom, essentially the deck limit mark can be placed where you want is my take. I would imagine any limit mark would need to be placed in a position that can be visually identified and relevent points checked for compliance against on inspection. I.e. could i readily check that the upper edge of your lower mast band point is within the required 60mm min and 100mm maximum range allowed?
Before getting too far ahead, worth understanding the class rules what is mandatory regarding fittings, especially the kicker. You may find you need a mast well of some sort to allow for a kicking strap that meets the rules.

The recommended notion that anyone trying anything new should ask for an interpretation from firstly their local measurer who if not clear will pass upwards to a National Technical Officer, then oneards to the International Technical Officer is a correct one. When we can expect that all will follow this advise instead of circumvention or that the playing field will become level for all designers, builders or manufacturers is anyones guess…

  • Like 1
Posted

Thanks for the wise responses to my post. Main reason was to put it out there for comment. I think we can put the rig to a sensible height under current understanding of the rules. Part of the interest in design is to identify areas of possible development and test the edges of the rules perhaps for  no other reason than to make it clear where they are. 

I usually work in wood so making a deck well in no real issue but to make a mold that incorporates a deck well is not easy for the home builder. The flat(ish) deck design concept would be very simple without a de k well, hence my interest in alternatives.

Thank you to Brad and others for replies to my post.

Now let's have a look at fin rake  !!  Both forward and aft !

 Cheers to all IOM sailors

 

Tom Roberts 

GOSPORT MYC

  • Thanks 2

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