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Over or under finned
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rtz



Joined: 31 Oct 2010
Posts: 154
Location: Oklahoma City

PostPosted: Wed Mar 21, 2018 10:00 pm    Post subject: Over or under finned Reply with quote

How do you know when you have too much or too little fin?

Is there a condition in which you would intentionally be over or under finned?
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westender



Joined: 02 Aug 2007
Posts: 1073
Location: Portland / Gorge

PostPosted: Wed Mar 21, 2018 10:14 pm    Post subject: Reply with quote

I'm underfinned if I'm the last one planing. If you can't keep your board in the water cause it's flying so high, you may be overfinned.
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jingebritsen



Joined: 21 Aug 2002
Posts: 3237

PostPosted: Thu Mar 22, 2018 1:12 am    Post subject: Reply with quote

upwind and down wind abilities can also help you figure out if you may have the wrong fin.

can't upwind well? try a larger one.

when reaching and want to upwind a bit and start flying as stated above? too much fin.

another clue: if your sailing friends out run you with similar kits and your only difference is fin size? typically, your fin may be too big. lift to drag ratios come into play.

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skyking1231



Joined: 10 Jul 2000
Posts: 222

PostPosted: Thu Mar 22, 2018 6:55 am    Post subject: Reply with quote

also keep in mind ...sail tuning. If you have a sail with little downhaul,and the wind is cranking...you will have too much pressure on fin...causing spinout. Once you properly downhaul the sail (provided sail is correct size), the pressure on fin will drop. So the fin can be correct size along
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d0uglass



Joined: 28 May 2004
Posts: 1194
Location: Bonita Springs, Florida

PostPosted: Thu Mar 22, 2018 7:21 am    Post subject: Reply with quote

If I put a bigger and more upright than usual fin on my freestyle-wave board I get sore shin muscles. I think it's from the toe-pointing and pressuring of trimming the board and riding off the fin. I also notice that the board isn't as free and surfy in the swells. But it can be worth doing if you're underpowered and/or there's a lot of current that you have to make up for with more upwind angle.

Rule thumb is the length of the fin shouldn't exceed the width of the board at the back footstrap.

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isobars



Joined: 12 Dec 1999
Posts: 18549

PostPosted: Thu Mar 22, 2018 8:40 am    Post subject: Reply with quote

In an article on that issue years ago, Robby Naish said he prefers to fin as big as he can without impairing maneuverability, while Ed Angulo said he prefers to fin as small as possible without spinning out.
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techno900



Joined: 28 Mar 2001
Posts: 3056

PostPosted: Thu Mar 22, 2018 8:52 am    Post subject: Reply with quote

Assuming your fin is within the recommended size range for your board, a small fin at low speeds can spin out (be pushed out), will hamper early planing and upwind ability. However, the same fin at high speed may be perfect, so it depends on your speed and skill.

Just the opposite if you choose a large fin for slow speeds, you get early planing, good upwind, no spin out. However, at high speed you lose control.

So, while a novice/intermediate may choose a 40cm fin for a particular board, an expert may choose a 30cm fin for the same board.
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cgoudie1



Joined: 10 Apr 2006
Posts: 2121
Location: Killer Sturgeon Cove

PostPosted: Thu Mar 22, 2018 10:13 am    Post subject: Reply with quote

More input. Big guys need bigger fins (and bigger sails), and some of us
ride with more of a back foot bias (not so good for wave riding, but
handy for swell slashing). If you're back foot heavy , you could try
adjusting your technique, or you could just get a little bigger fin.

If you can ride a fin on the small size, you can ride a bigger board into
higher winds. If you can control a bigger fin, you can get more sails to
work more of the time with the same board.

As stated earlier in this thread, if your fin is too small, others of equal size
and rig will be planning when you're slogging, if your fin is too big, you'll be
running for a smaller board when the wind picks up due to control issues
(bouncing and rodeo rides, in your case even railing up).

All this is extremely rudimentary, most of it is a balancing act between
the wind strength, your weight, your ability, your board size, your sail size,
and the type sails of fins you use.

.02

-Craig
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U2U2U2



Joined: 06 Jul 2001
Posts: 4690
Location: Shipsterns Bluff, Tasmania. Colorado

PostPosted: Thu Mar 22, 2018 11:33 am    Post subject: Reply with quote

Too little : is felt by lack of control associated with spinout ,upwind performance suffers.

Too large, I think tail walking will be common, fin too large to control. Differs from above in what happens to lose control. Poor performance , slo to plane .

Given the board in question, only so much can be done to alleviate things , give its size and obvious limitations.

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joethewindsufa



Joined: 10 Oct 2010
Posts: 995
Location: Montréal

PostPosted: Thu Mar 22, 2018 7:03 pm    Post subject: Reply with quote

xxx

Last edited by joethewindsufa on Fri Mar 23, 2018 7:00 pm; edited 1 time in total
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