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  1. #11
    that thing actually works? i have a quad fish and a thruster but would think in a good size hollow point that requires a real bottom turn it would spin out. yes I am sure kelly slater can surf a cooler lid in jaws but I got rid of my quad thing sucked spun out everytime waves got big and I cant see a tiny quarter inch insert making a huge difference. anyone ever surfed it in legit overhead point style waves? head high is good with a fish too. a few feet overhead and hollow is different.

  2. #12
    Join Date
    Apr 2012
    Location
    Treasure Island , FL
    Posts
    220
    Question? Do you really think its the same as a quad with the knub, I'm not a shaper but I can't see how you can replace or duplicate the center knub by changing the position of the fins. I'm all ears.

  3. #13
    Quote Originally Posted by StuckontheGulf View Post
    Question? Do you really think its the same as a quad with the knub, I'm not a shaper but I can't see how you can replace or duplicate the center knub by changing the position of the fins. I'm all ears.
    Distance of the rear fins off the rail and distance of the rears from the front fins makes a huge difference in how a quad rides. You can make a quad more thruster-ish by moving the rear fin closer to the stringer and you can increase drive by moving them further from the fronts. The key is finding the right combination for the board and the rider. Fin template can also play a huge part. I would agree with foamdust that if your quads are placed properly and you've got the right template you can get the desired effect without the nubster. Assuming you felt that the nubster added drive through your turns you should be able to gain that effect by moving your rears back a bit. Also a bigger rear template can help. If you felt more centered and less tracky with the nubster you would want to place your rears a bit closer to the stringer.

  4. #14
    I should add that looking at Kelly's quads in his quiver for France and Portugal I did not see a nubster. I'm guessing that he has tweaked his quad placement to get the performance he desires without the nubster.

  5. #15
    Join Date
    Jan 2009
    Location
    milton delaware
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    1,379
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    262
    Quote Originally Posted by gallerysurfboards View Post
    Distance of the rear fins off the rail and distance of the rears from the front fins makes a huge difference in how a quad rides. You can make a quad more thruster-ish by moving the rear fin closer to the stringer and you can increase drive by moving them further from the fronts. The key is finding the right combination for the board and the rider. Fin template can also play a huge part. I would agree with foamdust that if your quads are placed properly and you've got the right template you can get the desired effect without the nubster. Assuming you felt that the nubster added drive through your turns you should be able to gain that effect by moving your rears back a bit. Also a bigger rear template can help. If you felt more centered and less tracky with the nubster you would want to place your rears a bit closer to the stringer.
    I agree with all of this..I currently have four quads. two I shaped myself, one Ashton fish and a Chemistry disk. Moving the rear fins just slightly tailward, and slightly toward the stringer, really seems to stiffen up the feel. Also, swapping out the rear fins has an amazing effect to loosen up the board...going from 3 3/4" rears to 3 1/4" made the Chemistry disk into a completely different board, really better in smaller waves.

  6. #16
    Don't buy one, make one! Most of us have plenty of old composite center fins (any template) lying around. All you need is a jigsaw (heck, any saw will work), and a sander (or even sandpaper).

    Here's how I made mine in one afternoon:

    Step one... Go into your local surf shop with a pencil and paper. Ask to see the Knubster. Trace the outline onto the paper and get a good feel for the foil thickness and taper.

    Step two... cut the paper template out and trace onto your old center fin with pencil/marker

    Step three... clamp down the fin to a sawhorse (your deck, stairs, etc.) and saw out the template. It will be ugly and blocky, no worries, move on to....

    Step four... sanding. Using a power sander, you can polish your knubster down to retail quality in less than 30 minutes. If you don't have a power sander, grab some 80 grit sandpaper and sand the thing down by hand while you're sitting in front of your favorite surf video, Monday Night Football, Jersey Shore (whatever floats your boat). You may want to finish the final sanding with 220 grit for a nice smooth surface.

    Viola, KNUBSTER!

    My homemade knubster is a nearly perfect copy of the FCS version, except for the color. Since making the first, I've made a couple more of my own template just to see if I can feel the variation (not really).

    Funniest part is that I don't really like any of them!! I'm back on the good 'ol thruster, back-foot power surfing all the way. I guess that we can't all be Kelly...

  7. #17
    Join Date
    Apr 2012
    Location
    Treasure Island , FL
    Posts
    220
    I remember someone saying they made one when I stated in a different post I was gonna buy one. I'm going to make a slightly larger(height) one so I can ditch the rear fins and ride it as a tri but with the smaller center fin for groveling. Its kinda fun playing with all the combinations.

  8. #18
    Join Date
    Jul 2007
    Location
    Promontorium Tremendum
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    862
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    1
    Quote Originally Posted by StuckontheGulf View Post
    Cool Hanna, let us know if you think it makes that big of a difference to you. I have been reading the FireWire forum on the knubster and its interesting to see all the options and takes on it. Oh and I don't make that extra .50 cents, not a paid endorser, but wish I was
    got one in the mail today and gave it a whirl in clean thigh-high surf this afternoon, configured as shown below. lots more fun than it would have been with my usual thruster set-up but probably would need to go to quad mode in bigger surf for more stability. well worth the $15, if nothing else than for inspiring experimentation.

    Last edited by hanna; Oct 21, 2012 at 12:10 AM.

  9. #19
    ^putting a knub on a tri in really small or weak waves is like something I would do. I'm running a G-S trailer right now and it works fine up to head high (even with smaller M-5 sides).

    Might buy a knub when "bandwagon" prices go down. (I'd make my own if I had a throw-away fin lying around...but I don't)

  10. #20