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#4394 - 12/05/01 12:38 AM Re: Thinking [Re: majsteve]
basket.case Offline
enthusiast

Registered: 06/19/01
Posts: 305
Loc: toronto, canada
im i reading you right? are you calling the iacc boats a one design class?


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#4395 - 12/05/01 04:04 AM To show you I'm a nice guy despite everything else [Re: mhb]
Wouter Offline
Carpal Tunnel

Registered: 06/16/01
Posts: 9582
Loc: North-West Europe
To show you I'm a nice guy despite everything else

BR = VLB2 / MAB".

Board aspect ratio = Vertical length Boards squared / Mean or main area board..

This equation can only be one thing and that is the calculation of the board aspect ratio that is used to determine the effectiveness of the total area.

Compare it to the similar calcs performed on the sail area.

Wouter



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Wouter Hijink
Formula 16 NED 243 (one-off; homebuild)
The Netherlands

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#4396 - 12/05/01 12:37 PM Re: To show you I'm a nice guy despite everything else [Re: Wouter]
sail6000 Offline
old hand

Registered: 07/26/01
Posts: 800
Loc: MI
What a guy ! - thanks wout ,--and thanks Marc for working on this sail area to weight formula and much needed valueable information .
One huge problem we are facing here in the U S in promoting ALL formula classes is as I,m more readily understanding each day is a lack of general knowledge on catamaran design.
People will not be likely to become interested in something they do not understand . There is no readily available information on cat design elements , or how they effect sailing performance . There is no readily available easily understood articles or information on ISAF rating , -though there is a brief explaination of Texel .
We need some good articles explaining design elements and how they are measured . The board ratio calc . is a good example , most will not understand why a board calc. would be needed or how different a Hobie 18 board is from a more modern Inter 20 board , wetted surface areas their effectiveness , cord section etc .
-I,ve build one cat and have a basic understanding of design , though do have an extensive cat racing background for practical application ,

Promoting the formula classes will involve an educational process , the U S has used Portmouth rating ,--an average time system , they have added design modification factors in an ever growing list . --The rest of the cat sailing world uses ISAF -and Texel design measurement ratings so naturally people who are accustom to design elements as a basis for rating are more familiar with what aspects make a good fast seaworthy cat design.

-Lets all try to work on making all information readily available for all formula cat sailors.

Carl



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#4397 - 12/05/01 11:37 PM Re: To show you I'm a nice guy despite everything else [Re: Wouter]
mhb Offline
newbie

Registered: 09/08/01
Posts: 48
Loc: Toronto
Thanx Wouter,

Always thought you where a nice guy and I never said any different.

VLB has already been defined as:

"VLB = Maximum board depth below the hulls"

in the very same document.

You claim that 'MAB = Mean or main area board'. Would you say that this is the underwater surface area of the board ?

I will have a look at the calc for sail area as you suggest.

cheers...
Marc




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#4398 - 12/05/01 11:46 PM Underwater area ? Yes.(nm) [Re: mhb]
Wouter Offline
Carpal Tunnel

Registered: 06/16/01
Posts: 9582
Loc: North-West Europe
Wouter



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Wouter Hijink
Formula 16 NED 243 (one-off; homebuild)
The Netherlands

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#4399 - 12/06/01 08:27 AM Re: Underwater area ? Yes.(nm) [Re: Wouter]
john p Offline
member

Registered: 07/17/01
Posts: 183
Only put in the surface area of one side of one board



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John Pierce

[email]stealthmarine@btinternet.com
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#4400 - 12/06/01 01:44 PM Re: Thinking [Re: john p]
Mike Hill Offline
old hand

Registered: 06/18/01
Posts: 819
Loc: St. Louis, MO,
John,

Thanks for the great input. Some new facts to mull over.

Mike Hill




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