Which fin to make next? Poll

Discussion in 'Global Surf Talk' started by Roy Stuart, Nov 1, 2014.

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Which fin would you like best?

Poll closed Nov 29, 2014.

  1. Log

    2 vote(s)
    11.1%

  2. Fish

    8 vote(s)
    44.4%

  3. Pivot

    5 vote(s)
    27.8%

  4. 70's

    3 vote(s)
    16.7%
Multiple votes are allowed.
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  1. Nov 3, 2014 #61
    zach619

    zach619 Well-Known Member

    4,733
    Jan 21, 2009
    centerfin.jpg Here is a photo of my actual fin. Forgot I had one on this hard drive. Same exact one as you. I guess I will have to give it a push when I get home. I am still angry with it for shanking my hand and sanding me to the ER. But, that said, the past two big swells we had, I took that board, with that fin on the biggest days. There is always a wave or two each day that I had to bail, or pearled an air drop, but I have been SUPER happy with the HPLB with that fin. I was nailing big hits off the lip and landing big floaters to the point where I toned it down, worried about snapping the board. Not sure how much this tank can take, but so far so good. If you like carving (you probably have already tried this) but the side bites man, the 9" is a tad long, but with enough footwork, you can throw some nice clean, precise cutbacks on it. It feels a bit too loose as a single when I have gone that way. I am loving the sidebites, like I said with the fin pushed up, it has tons of responsiveness. I really just wanted to go 7" with the next one, cause the waves here, even at high tide end up super shallow on the inside and I feel like the thing is gonna snap one day. Its catches sand on the inside quite a bit, just because of its length.
     
    zach619, Nov 3, 2014
    zach619, Nov 3, 2014
  3. Nov 3, 2014 #62
    Roy Stuart

    Roy Stuart Well-Known Member

    1,514
    Jan 27, 2013
    Not if John John gets his!

    ;)
     
    Roy Stuart, Nov 3, 2014
    Roy Stuart, Nov 3, 2014

  5. Nov 3, 2014 #63
    HighOnLife

    HighOnLife Well-Known Member

    1,273
    Jun 3, 2014
    These are just weird and I don't understand the physics behind FCS's strange line of SUP and longboard fins.

    Anyone care to explain?

    [​IMG]
     
    HighOnLife, Nov 3, 2014
    HighOnLife, Nov 3, 2014
  6. Nov 3, 2014 #64
    Roy Stuart

    Roy Stuart Well-Known Member

    1,514
    Jan 27, 2013
    The usual folklore is that drive comes from the fin base, but in fact it comes from the lower portion of the fin but not so much from where the fin contacts the board, because the board/fin interface is turbulent and thus high on drag low in lift.So, removing area from the board fin junction and the putting the lost area up the fin a bit should provide the same drive with less drag.

    Unfortunately the long raked leading edge of the fin makes the board/fin junction even longer than is normal, negating the effect of the cutaway and reversing the gain into a loss. Also the extreme rake of the leading edge at the base will feed turbulent flow up the fin into the trailing edge bulb area, further f8cking up the result.

    No doubt they'll still work but it seems that the design hasn't been rigorously thought through. Undoubtedly enough people will want to try it that it will make them some money and deliver a reputation for innovation... after all design deficiencies can be overcome by marketing.

    Here's a fin with a similar concept:

    [​IMG]
     
    Last edited: Nov 3, 2014
    Roy Stuart, Nov 3, 2014
    Roy Stuart, Nov 3, 2014
  7. Nov 14, 2014 #65
    Roy Stuart

    Roy Stuart Well-Known Member

    1,514
    Jan 27, 2013
    Ok thanks for the poll answers, it looks like the Fish fins win, First however we'll be making thruster fins on this template from blending curves, with the addition of Bumpy Leading Edges, they'll be ready next week:

    [​IMG]
     
    Roy Stuart, Nov 14, 2014
    Roy Stuart, Nov 14, 2014
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