Single Fin

Any questions about learning to surf, or general questions about equipment, technique or improving your surfing.

Single Fin

Postby will32890 » Tue Oct 26, 2010 11:57 pm

I tried out my 5'6"x20"x3" single fin for the first time today. The swell was about a foot overhead. I have a 10" fin on it. It's that dolphin shape. I noticed it slides out like crazy if I try to climb up the wave to turn. I had the fin about halfway forward in the box. Should I just move the fin back or do I potentially need a different fin in there?
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Re: Single Fin

Postby Murtle's magic board » Fri Oct 29, 2010 5:04 pm

I think your fin is far to big.. Spin out is what's happening.. Try a smaller one..
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Re: Single Fin

Postby will32890 » Fri Oct 29, 2010 6:29 pm

Oh wow, I thought that would be the opposite, you learn something new every day! Thank you, I'll try a smaller fin out!
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Re: Single Fin

Postby Murtle's magic board » Mon Nov 01, 2010 7:55 pm

I am no expert and can only relate it to windsurfing... If your fin was too big and you reached a certain speed the presure would build up and you would slide side ways.. Very strange feeling.. So it might be that but not got near that surfing... See what it does if you try a smaller fin...good luck
:-)
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Re: Single Fin

Postby will32890 » Mon Nov 01, 2010 8:11 pm

I'll certainly have to try it next time there is a decent swell. Oddly enough dropping in and riding backhand was easier than frontside
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Re: Single Fin

Postby el_timmo » Mon Nov 22, 2010 5:03 pm

I may be wrong, but I was sure when you had a bigger fin, it created a bigger lift at high speeds forcing the fin to list out of the water, so the force of your feet pushing against the side of the board (in the footstraps) forced the board to spin out. Also, if you had too small a fin, even though there wouldn't be as much lift, you'd still spin out easier, which is why freestyle windsurfers usually use very short fins.

I may be wrong, but I wouldn't imagine that you would generate so much speed on a surfboard as to create that much lift. Having the fin further forward on a windsurfer does make it turn easier, while having it further back stiffens it up a bit and makes it track upwind and stay directional better. I guess it may be similar with a surfboard..... any experts care to weigh in?
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Re: Single Fin

Postby will32890 » Mon Nov 22, 2010 6:45 pm

I switched to about a 7" fin and the thing holds much better, except going backhand. The larger, more upright fin held better on backhand waves. I hope to find just a bunch of fins to try out. The board is only 5'6" so I can see where a massive fin could cause problems. I'll get to posting pictures as soon as I have time off of work. I'm at work now haha :-D
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Re: Single Fin

Postby flacky » Sun Nov 28, 2010 11:16 am

mail the shaper. Ask him what fin he recommends.
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Re: Single Fin

Postby will32890 » Sun Nov 28, 2010 1:22 pm

flacky wrote:mail the shaper. Ask him what fin he recommends.

I would but the board was shaped close to 40 years ago
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Re: Single Fin

Postby flacky » Sun Nov 28, 2010 1:39 pm

what is it? i'd have thought a 4a fin would suit most boards from that era.

http://www.thaliasurf.com/gr4afin7i.html
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Re: Single Fin

Postby will32890 » Sun Nov 28, 2010 9:32 pm

flacky wrote:what is it? i'd have thought a 4a fin would suit most boards from that era.

http://www.thaliasurf.com/gr4afin7i.html

That looks much better than what was on it. The fin on this was beastly. Pretty damn upright and about 10". That Greenough fin looks like it would be sweet though
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Re: Single Fin

Postby Back to Top » Mon Nov 29, 2010 3:08 pm

will32890 wrote:
flacky wrote:mail the shaper. Ask him what fin he recommends.

I would but the board was shaped close to 40 years ago


Surely it's glassed on from that era?
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Re: Single Fin

Postby will32890 » Mon Nov 29, 2010 5:37 pm

Back to Top wrote:
will32890 wrote:
flacky wrote:mail the shaper. Ask him what fin he recommends.

I would but the board was shaped close to 40 years ago


Surely it's glassed on from that era?

Nope, It's probably mid to late 70's the fin is moveable, I guess close to 35 or so would be more the era?
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Re: Single Fin

Postby Back to Top » Mon Nov 29, 2010 6:01 pm

Get some pics up!!
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Re: Single Fin

Postby will32890 » Mon Nov 29, 2010 6:17 pm

Back to Top wrote:Get some pics up!!

The best I can do is a link right now. I have to figure out this image stuff but here ya go http://www.flickr.com/photos/iamwillg/s ... 368228853/
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Re: Single Fin

Postby flacky » Mon Nov 29, 2010 6:31 pm

That probably belongs in a museum!

http://www.surferssupplies.com/boards/bahne_page_1.html

Looks like a cracking shape. I tried to make a board very similar in outline, nicked from the joel tudor diamond egg, but i put a heap of roll on the bottom and turned it into a displacement hull, but with too much rocker.

You'll have the shapers callipers twitching over that no doubt!
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Re: Single Fin

Postby will32890 » Mon Nov 29, 2010 6:44 pm

flacky wrote:That probably belongs in a museum!

http://www.surferssupplies.com/boards/bahne_page_1.html

Looks like a cracking shape. I tried to make a board very similar in outline, nicked from the joel tudor diamond egg, but i put a heap of roll on the bottom and turned it into a displacement hull, but with too much rocker.

You'll have the shapers callipers twitching over that no doubt!

I've got to say this is one of the most fun boards i've ever ridden. It's 5'6"x22"x3". It paddles so well!
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Re: Single Fin

Postby Bearded Gimp » Tue Nov 30, 2010 12:03 pm

Stick your pics up on www.swaylocks.com and I'm sure someone will be able to tell you all about it. The guy who shaped it may even be a member - there's plenty of old-timers posting there. They're probably the best ones to ask about a suitable fin for it as well
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Re: Single Fin

Postby will32890 » Tue Nov 30, 2010 12:51 pm

Bearded Gimp wrote:Stick your pics up on http://www.swaylocks.com and I'm sure someone will be able to tell you all about it. The guy who shaped it may even be a member - there's plenty of old-timers posting there. They're probably the best ones to ask about a suitable fin for it as well

Thanks I'll go do that!
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