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Curiosity on standard fin sizing in new boards.
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capetonian



Joined: 11 Aug 2006
Posts: 1113
Location: Florida

PostPosted: Fri May 22, 2020 4:20 pm    Post subject: Reply with quote

I haven't ridden the 2019 Goya quad so I can't give any board specific thoughts. In this video Francisco suggests riding it as a quad or a twin.
https://vimeo.com/224988476

Is this your light wind board? If so then large twins (17 cm or 17.5) are a good choice for making the board "feel" like it releases a bit more like a single fin for getting planing (though not necessarily plane earlier because rocker influences that more far more than fins). I prefer quads for control in strong winds and twins for liveliness in light winds.
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Ugly_Bird



Joined: 04 Nov 2008
Posts: 256

PostPosted: Fri May 22, 2020 4:25 pm    Post subject: Reply with quote

U2U2U2 wrote:
Of course the area would be nice to know.

Trace fin outline.Start at the base , in .5cm intervals draw lines across the fin edge to edge .
Measure the lengths, ie. 9 cm, 9.25 cm etc. Add all the lengths , ie 9+9.25= 18.25
Divide by 2, ie 18.25 / 2 = 9.125, this is the area on the fin in square cm.


Much easier to do that by weight if you have access to a balance.
Cut out a square from paper , say, 10 cm x 10 cm and weigh it out. That is weight of 100 sq.cm. Then, trace and cut out the fin shape out of the same paper, weigh out, do the ratio, done!
Old school curve integration at its best Smile

Andrei.
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U2U2U2



Joined: 06 Jul 2001
Posts: 5359
Location: Shipsterns Bluff, Tasmania. Colorado

PostPosted: Fri May 22, 2020 6:36 pm    Post subject: Reply with quote

I am to weigh paper?
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K4 fins
4Boards....May the fours be with you

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