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What determines maximum sail size for a board?
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capetonian



Joined: 11 Aug 2006
Posts: 1131
Location: Florida

PostPosted: Sat Oct 31, 2020 11:52 am    Post subject: What determines maximum sail size for a board? Reply with quote

Fanatic Mamba 104 L 224 cm long 60.5 cm wide - max sail size 6.8
Quattro Cube 106 L 226 cm long 62.5 cm wide - max sail size 6.0
Severne Pyro 105 L 226 cm long 62.5 cm wide - max sail size 6.7
Exocet X-Wave 103 L 224 cm long 63.5 cm wide - max sail size 6.8
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NOVAAN



Joined: 28 Sep 1994
Posts: 1356

PostPosted: Sat Oct 31, 2020 12:36 pm    Post subject: Reply with quote

Water conditions, body weight type of board. Also wind conditions. Big gusts or big lulls.
Lots of people are having more fun on bigger boards and smaller sails. Unless your in really steady winds sinker boards are a lot of work. Also if the wind drops the bigger board is easier to get back to the launch. I'm 165 lbs and sail a 3S 96 with a 4.2 Its thin and narrow in the tail and rides smooth in the chop.
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NOVAAN



Joined: 28 Sep 1994
Posts: 1356

PostPosted: Sat Oct 31, 2020 12:37 pm    Post subject: Reply with quote

Sorry guys I thought he asked for min. sail size. I guess most of that applies to the max sail also
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isobars



Joined: 12 Dec 1999
Posts: 20058

PostPosted: Sat Oct 31, 2020 2:09 pm    Post subject: Reply with quote

Too much sail, just like a COE that's too high, will also sink the nose. But if one can control it -- i.e., has greater skill -- a high COE (plus a tight leech) can produce some big air and extended hang time.
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dllee



Joined: 03 Jul 2009
Posts: 4922
Location: East Bay

PostPosted: Sat Oct 31, 2020 2:35 pm    Post subject: Reply with quote

Efficiency.
You can put a 7 meter sail on a 85 liter freeride board, but you're better off with a 6 and 110.
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ss59



Joined: 10 Nov 2016
Posts: 91

PostPosted: Sat Oct 31, 2020 3:29 pm    Post subject: Reply with quote

Probably got this wrong but I always thought max sail size is determined by max fin size which in turn is determined by the one foot off-width
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swchandler



Joined: 08 Nov 1993
Posts: 9959

PostPosted: Sat Oct 31, 2020 3:56 pm    Post subject: Reply with quote

ss59, I'm also of the opinion that sail and fin size must be properly matched to get the maximum performance possible. If the fin is too small, particularly with larger sails, the sail and its power are heavily compromised.

Now, considering the wavy nature of the boards highlighted, the likely smaller multi-fin arrangements on these boards is probably the limiting factor in recommended maximum sail size. You could theoretically use a larger sail, but the sail's potential is lost because it's out of balance with the fin(s). However, you could increase fin(s) size and the total fin area to achieve a better balance with the sail. The downside with larger sails and more fin area is getting the kind of maneuverability and handling you want in a wave environment.
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dllee



Joined: 03 Jul 2009
Posts: 4922
Location: East Bay

PostPosted: Sat Oct 31, 2020 7:09 pm    Post subject: Reply with quote

Circa 1988, Doug Haut placed 2nd overall in a San Luis Res. speed trial using his 8'8" x 17" speed needle with a 7.0 borrowed sail in gusty 10-20 mph wind. His board was probably around 65-70 liters.
Fin was Rainbow Speed 7.75 that was a bit thicker than the US box.
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U2U2U2



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

PostPosted: Sun Nov 01, 2020 9:49 am    Post subject: Reply with quote

The people who write the advertisements, going from your chart, nothing much is consistent. Far too many variables to have a written in stone specification.
What one is comfortable on, a 7.5, another could be 6.5.

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

http://www.k4fins.com/fins.html
http://4boards.co.uk/
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techno900



Joined: 28 Mar 2001
Posts: 3850

PostPosted: Sun Nov 01, 2020 10:54 am    Post subject: Reply with quote

I have two similar boards, one 105L bump and jump and a 108L slalom. Both the same width. The 105L board is best with 5.2 to 6.4 sails (6.0 ideal). The 108L board is best with 6.6 to 8.4 sails (7.6 ideal).

It's the tail design/width and fin size that determines sail size in my experience.
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