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Sail size vs the boards volume???

 
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jimwilkins



Joined: 08 Feb 2008
Posts: 70

PostPosted: Tue May 27, 2008 12:47 am    Post subject: Sail size vs the boards volume??? Reply with quote

Sail size Vs Board Volumes????

I have a 85 liter board that I'll rig a 5.5 on, can i say go bigger to a 6.5, the only issue i could see would be the fin size. thanks for any input
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U2U2U2



Joined: 06 Jul 2001
Posts: 5467
Location: Shipsterns Bluff, Tasmania. Colorado

PostPosted: Tue May 27, 2008 8:48 am    Post subject: Reply with quote

Lots of issues here,
What style and board ? Sailor weight ? Powered up ?

The fin would help being larger, but the board itself has a range, ref: float and control.

I would answer without any further information that 6.0 would be 'bout right, unless you are light, like -150lb.

I would consider a 6.4 on my 87L Tabou 3S, my weight is 140LB/64KG

more like a 5.6--6.0. This is a wide/stubbie FSW board.

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4Boards....May the fours be with you

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jam-1



Joined: 23 Mar 1999
Posts: 81
Location: Redwood City

PostPosted: Tue May 27, 2008 12:17 pm    Post subject: Reply with quote

I'm sure you could make it work, but the question is whether it would be better to step up to a bigger board. Larger sails exert a larger downforce on the board. I have found that a sail that size makes the board "push" more. It is slow to get up on a plane, and it acts different even when it does get on a plane.
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never_enough_wind



Joined: 15 May 1998
Posts: 12
Location: Sherman, 3rd Ave

PostPosted: Tue May 27, 2008 12:56 pm    Post subject: Reply with quote

If you have a reasonably current board shape I think that you can get by OK with a 6.5 on an 85L with the appropriate fin. I sail a lot with my JP FSW 85L and a 6.6 North X-Type (no cam) sail. This combination works great with a 34cm MFC freeride shape fin. I am about 190 lb and will use this setup with winds from about 18-24 mph. Just crank in more downhaul for the higher end and hold on Very Happy
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jimwilkins



Joined: 08 Feb 2008
Posts: 70

PostPosted: Tue May 27, 2008 1:31 pm    Post subject: Reply with quote

Just for info to the topic my weight is 160 and the boards are a mistral 85 freestyle/wave Score. The other is a Fanatic Bee 84,
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afolander



Joined: 22 Jul 2002
Posts: 74

PostPosted: Tue May 27, 2008 4:00 pm    Post subject: Reply with quote

The board design and what you are trying to do on the water can have a big effect on what works for you. As an example of how board design can affect sails, I have three ~100 liter boards, one (Kinetic older style) which I sail up to a 7.7, whereas I will not rig larger than a 5.8 on my shorter length 103 Mistral Syncro.

I have been happy with an oversized sail for a given board going back and forth and perhaps jumping /carving jibes on smooth swell and steady wind in ebb conditions.

In chop or with gusty winds, a small board may manuever faster than you can control the big sail , resulting in:
- the sail feels sluggish compared to the board
- precision carving manuevers become problematic
- legs and ankles get more abuse in chop, a sensation not unlike going too fast down a hardpacked mogul field on snow skis.
- if the wind suddenly comes up you may also find that a small board / big sail combo may tend to spin upwind and stall out.
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andydavis



Joined: 11 Apr 1999
Posts: 319
Location: Point Isabel

PostPosted: Tue May 27, 2008 4:04 pm    Post subject: sail size Reply with quote

jam-1 wrote:
...Larger sails exert a larger downforce on the board. I have found that a sail that size makes the board "push" more. It is slow to get up on a plane, and it acts different even when it does get on a plane.


normally, untrue
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isobars



Joined: 12 Dec 1999
Posts: 20935

PostPosted: Tue May 27, 2008 8:09 pm    Post subject: Reply with quote

Good advice so far, but there's nothing like experimentation. Borrow a bigger sail (and if necessary a bigger fin) and try it out. If you doubt your own ability to give it a valid test, let a better sailor whose advice you trust try it.

I thoroughly and often enjoy bashing and slashing with a 5.2 on my 65-liter boards @ 190 pounds, and once sailed a 5.8 on them out of curiosity. (It was doable, but not recommended or repeated.)

\m/
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keycocker



Joined: 10 Jul 2005
Posts: 3598

PostPosted: Tue May 27, 2008 10:26 pm    Post subject: Reply with quote

I didn't want to say that because it is a marginal thing to do, but Iso is exactly right. I sail 5.3 on my 67 liter board and struggle if I am not way overpowered, but it works. I didn't like 5.9 at all. I like small boards and my favorite sail is a 5.3 Hot SF so for me it is a good time.
Anyone says that won't work hasn't been there like he has.
In windsurfing the only thing that doesn't work is something that isn't fun for you personally.
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