Fins

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fozzy
fozzy
SA
501 posts
SA, 501 posts
6 Apr 2012 6:22pm
OK so this post is clearly not for the experienced surfers that habit the forums but for those out there that, well, maybe aren't so experienced.

There may have even been topics on this before but I thought I would take a moment to discuss fins as an alternative to necessarily buying a new board. (Unless you really want one of course in which case I say "go nuts"!)

To the point. I recently bought myself a new board. I already own this particular make and model of board (and love it) in a 6'6" but wanted a 6'4" for a slighter shorter outline. As I am a slightly larger bloke 6'1" and 90 kgs I surf large fins which were not recommended for this new board. I had ordered some medium fins but whilst waiting their delivery threw on my large (PC7's) which I ride on my 6'6". Terrible is the best way to describe the feeling. On my 6'6" they work well, giving good drive and a pivotal turn. Take 2" inches off the board length and a couple of other refinements and it all changes. The first turn I went to crank into I actually spat myself off the side of the board whilst it continued down the face of the wave. Thereafter I had to really set my rail before making a turn.

A friend lent me a set of K2.1's and the transformation was ridiculous. Loose and pivotal and not too small for my carcass which was previously a concern of mine with going for medium fins which "they" say are only good for up to 80 kgs. (I now own a set of my own in addition to some newly purchased PC5's)

The moral to the story is this. If you are slightly frustrated with your board and think you need a new one, perhaps consider experimenting with fins first. The same board can feel like a completely different one at about 1/8th the cost.

Don't get me wrong, I'm not anti board purchase (clearly) but if funds are tight and you're looking for a different feel, borrow some if you need to first, but try some different size, shape, composite fins and you may be very very surprised.

Today's lesson brought to you by Fozzy incorporated.
Sham1984
Sham1984
VIC
415 posts
VIC, 415 posts
6 Apr 2012 9:14pm
I currently use m5's, they've been great. However I notice that when it's a bit bigger (and especially when it's hollow) I seem to slide a bit going down the line. moreso when I try and adjust my direction slightly to get a good line.

Could bigger fins help or is it more to do with my actual surfing?

I can surf smaller hollow waves no worries, like up to head high before I start feeling a bit uneasy.

Sham1984
Sham1984
VIC
415 posts
VIC, 415 posts
6 Apr 2012 9:34pm
Just to clarify, I was surfing a left today (I'm goofy) and I'm moving my toes closet towards the rail to try and dig that Rail in. But my board would slide down the face slightly? Does that make sense? Wast much but was enough to make me fall off.

Happened every single wave! I was surfing a reef that was getting towards the upper end of my skill level as far as height and steepness goes

It happened to me a few times in png as well.
fozzy
fozzy
SA
501 posts
SA, 501 posts
6 Apr 2012 10:31pm
Sham I'm certainly no expert on hydrodynamics but on the face of it I would suggest a larger fin, and by larger I mean deeper, may assist. Notwithstanding anything else, the deeper the fin the more hold it will give.

Spin out is common in windsurfing where the lateral forces being placed on the fin exceed its capabilities and the fin can no longer bite or grip the water. Admittedly with windsurfing there can be a myriad of other factors that contribute to it. Windsurfers then need to bare off the wind to reduce the lateral forces and enable the fin to grip again before re-applying those forces.

Essentially with surfing it's the same. The speed and pressure of the water passing over the fin is too great and causes the fin to lose its grip. The depth of the fin can be a factor as well as the foil of the fin.

I would think it's happening in the larger stuff rather than the smaller stuff as the pressures being exerted on the fins are relative to the amount of water volume/pressures passing over them. The more hollow the wave the more lateral forces being applied to the fin which it in turn needs to resist.

There may be an aqua physicist (not sure if this is a real occupation) that will chime in and tell me I'm full of it but that is my understanding of it all. I hope this helps a little but if it were me in that situation I would certainly try a slightly larger fin. Bearing in mind it is horses for courses. If the wave is dictating getting shacked and so is straight line surfing without looking to rip the top off, then you can fore-go maneuverability for drive and hold.

Of course this advice (if you want to call it that) is formed on the basis that the board itself is up to the task of performing in the conditions.


Sham1984
Sham1984
VIC
415 posts
VIC, 415 posts
7 Apr 2012 11:19am
Board is a 6'2 round pin Oceanline custom. Made for 'good' waves that I'd find on my trip and down south, as well as fast beachies like trigg on bigger days. Which is why I assume it was a technique thing!

Will try some bigger fins and see how I go! Thanks!
Albos
Albos
VIC
162 posts
VIC, 162 posts
11 Apr 2012 4:30am
maybe look at a set of H-2's. They have good hold and drive.

I always enjoy mixing my fins around. or just leaving the tail fin out when the conditions are not good to keep the surf interesting.
LateStarter
LateStarter
WA
589 posts
WA, 589 posts
11 Apr 2012 9:40am
fozzy said...

The moral to the story is this. If you are slightly frustrated with your board and think you need a new one, perhaps consider experimenting with fins first. The same board can feel like a completely different one at about 1/8th the cost.



Good advice mate!



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