Quad fin toe question

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Racerx63's picture
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Quad fin toe question

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I searched through the archives and found a lot on the topic but nothing that answered a question I have.I appreciate any insight you might have.

Is there anything detrimental to having the font fins and the back fins the same toe-in at 1/8"? Everything I have read has the front fins at one toe-in measurement and the rears with less to no toe-in and most meet at a certain point measured off the nose.

I have ridden a board that is 6'0 x 15.5 x 21.25 x 15.25 x 2 5/8" and in taking all the dimensions off of it I noticed that the fins had the same toe-in at 1/8". I have always thought this was wrong but the board worked great. Measuring the toe at the nose of the board, the front fins were 4.5" off the nose and the rears were 1.5". The fronts are at 11" and 1 1/8" off the rail. The rears are at 5" and 1 7/8" off the rail.

I am going to make a version of this board. Logically, because it worked good I should just use the same placement, but I can help to think that maybe it would be better with a little more front fin toe--in.

Am I wrong in thinking this?

Thanks

 

 

 

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Re: [Racerx63] Quad fin toe question

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There are different schools of thought...the one I subscribe to calls for the fronts and rears to be parallel.

Unless you're using McKee's quad setup (what I believe is sort of a thruster setup with a split center) those quads need to be tight and parallel to ensure that they are working in unison to prime the flow off the front fin for the second fin to generate the drive.

Check out the "How I Probox" thread for fin setup details.

With quads, it's more about position relative to the rail as opposed to long, imaginary lines to the nose (or fore/aft).

There are folks that do not agree, but I love the way my quads ride and the folks who hipped me to this setup have a lot more time in the R&D arena than I do.

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Re: [Racerx63] Quad fin toe question

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I recently made an "experiment" with quads.Same toe(1/8"),same cant(6 degrees),and same distance in from the rail(1 1/4"). The front of the back fins are only about 1/2" away from the trailing edge of the front fins.The board is a 6'6x20 7/8x2 7/8 fatburner replica,flat bottom.The board feels snappy and fast,almost finless.It still does the quad thing,likes a good high line and has lots of traction and drive,and the most release off the top I've ever seen with a board this size.Bottom turns are  strange though because the whole time your dropping in it feels like you don't have any fins and will slide out if you try to turn,but the second you do turn it grabs and you have the control of a quad.....Its the board on the right in the pic.

 

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Re: [Racerx63] Quad fin toe question

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Your thinking sounds correct. 

If you like the way the board rides, and you're going to try and reproduce it, I'd suggest staying w/the fin set up.

My basic understanding is: Less toe = more speed/turns don't engage as easy, and vise versa, and, it's my impression more quads have less toe in the back than the front, but I don't know for sure.  My set up below is based on my theory that I wanted my quad to feel as close to a tri - hence the rear fin set up - but to have the drive and looseness of a "quad" w/out the tracking I've experience w/too much side fin.

I like Bill B.'s to the nose idea, but I've gone with off the nose @ 2" on the rear on my quads...   I'm also running seven boxes - one for a center tri set up, two side to the nose, @ 12" for the tri, @ 1.25" off the rail, w/@ six degrees of cant, and two sides further up, for the quad set up for weaker waves, set to the nose @ 14" @ 1.75" off the rail, w/14 degrees of cant.  The rears are @ 6" up and 3" off the rail w/no cant (When I run two center fins/four degrees w/side fins (RedX has four degrees built in.)

TaylorO

Racerx63's picture
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Re: [afoaf] Quad fin toe question

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Thanks everyone, it sounds like it is correct then. I will go ahead and use the fin placement that's on it.

 

afoaf - That is a great thread. The fin placement on this board is a lot more spread out but the fins do run parallel like yours. As well as this board surfed there is definitely something to it. I originally thought it was a Mckee's set up by looking at it until I measured them.

 

Thanks again

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Re: [Jesus] Quad fin toe question

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Jesus wrote:

I recently made an "experiment" with quads.Same toe(1/8"),same cant(6 degrees),and same distance in from the rail(1 1/4"). The front of the back fins are only about 1/2" away from the trailing edge of the front fins.The board is a 6'6x20 7/8x2 7/8 fatburner replica,flat bottom.The board feels snappy and fast,almost finless.It still does the quad thing,likes a good high line and has lots of traction and drive,and the most release off the top I've ever seen with a board this size.Bottom turns are  strange though because the whole time your dropping in it feels like you don't have any fins and will slide out if you try to turn,but the second you do turn it grabs and you have the control of a quad.....Its the board on the right in the pic.

 

 

Beautiful boards. I have to say on the board I tried it had a similar feel. Very free like it had no fins but when I went to bottom turn it held great and accelerated back up the face better than any other board I have. The board definitely impressed me.