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 Post subject: Main Sail Window
PostPosted: Fri Sep 14, 2012 8:57 am 
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Joined: Tue Jul 19, 2011 7:15 am
Posts: 227
Location: Indialantic, FL
Are there any negatives to having a window in the main sail? I've seen a few pictures of some that do, but most don't. Does it make the sail illegal for class racing? Does it have to be a certain size to stay legal?? There are many times when I wish my main had one.

Mark

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 Post subject: Re: Main Sail Window
PostPosted: Fri Sep 14, 2012 9:15 am 
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Site Rank - Old Salt

Joined: Mon May 09, 2005 10:25 am
Posts: 2568
Location: Jersey Shore
From the Hobie Class Association General Rules

12.1.b) Windows and telltales may be added as desired.

Yes class legal. From a practical standpoint, it is small and not well located, so you will use it very infrequently if at all. Much easier to just look under the boom.

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 Post subject: Re: Main Sail Window
PostPosted: Fri Sep 14, 2012 10:09 am 
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Joined: Tue Jul 19, 2011 7:15 am
Posts: 227
Location: Indialantic, FL
Thanks SRM. I would be adding my own window, and it sounds like I could size and locate it where I wanted.

Mark

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 Post subject: Re: Main Sail Window
PostPosted: Fri Sep 14, 2012 10:11 am 
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Joined: Mon Jul 14, 2003 7:11 pm
Posts: 4611
Location: Detroit, MI
You can make the window as large as you want, but avoid crossing any panel seams. That's probably why the stock window is so small.


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 Post subject: Re: Main Sail Window
PostPosted: Fri Sep 14, 2012 10:56 am 
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Joined: Mon May 09, 2005 10:25 am
Posts: 2568
Location: Jersey Shore
The other reason that small windows are used is that the vinyl material generally used for sail windows is not as "dimensionally stable" as the dacron used to build the rest of the sail. This means that the window material will stretch and distort more than the surrounding material which will affect sail shape. So keeping the window as small as possible is preferred. You could use mono-film, which is more dimensionally stable than dacron or vinyl, for the window but it creases and isn't as durable as vinyl. Everything is a trade-off.

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