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A large fin box in an Starboard Airborn 8.8

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Created by Black Sheep 1 month ago, 25 May 2020
Black Sheep
25 posts
25 May 2020 4:09AM
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A large fin box in an SB Airborne 8.8, would that be a good idea?
I recently bought an SB AB 8.8 2015 second hand, I had already tried an SB WP 8.10 and that quad fin but I didn't really like it.
I now also experience that with the AB 8.8, hence the plan to build a large fin box in it.
It has already been mentioned more on the forum here, but never the findings with this.
I just want to place the box back more than in the picture, just over the fcs box.

justaddwater
NSW, 184 posts
25 May 2020 8:57AM
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Black Sheep said..
A large fin box in an SB Airborne 8.8, would that be a good idea?
I recently bought an SB AB 8.8 2015 second hand, I had already tried an SB WP 8.10 and that quad fin but I didn't really like it.
I now also experience that with the AB 8.8, hence the plan to build a large fin box in it.
It has already been mentioned more on the forum here, but never the findings with this.
I just want to place the box back more than in the picture, just over the fcs box.



I would be doing it,I don't surf any board without a fin box,as I tend to like 2/1 set ups with a tight cluster,I was considering that board but declined for that very reason.Make sure the box is reinforced as there won't be any h/density pvcin that area go for it! That box placement looks ok as it is around the quad rear mark,what works for me consistently is a formula... put a straight edge across the tips of front fins transfer vertically down mark board,then your critical measurement to the front of Finn in the box is around1/4--1-1/4 I never go for ward of the mark!.regardless of changing fin sizes you will find your happy place in there somewhere.In my younger days I worked with some high profile shapers on log boards and this formula was consistent with them all.Having said that there always exceptions to the formula !,good purchase and good luck

515
476 posts
25 May 2020 2:40PM
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I don't think you want a longer box than the us box that's been added.
So you want a us box further back where the slot box is. My suggestion is to route them both out. Replace box hole with high density foam (with epoxy resin with micro balloons). Route out for finbox exactly where you want it with layers of glass and resin). A couple of layers of glass over finbox.

Black Sheep
25 posts
25 May 2020 5:14PM
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Sorry, the photo is an example of someone who has already done it. But in my opinion too much forward and too big fin box. I want to use a smaller one, like in the picture of my fin box.

Black Sheep
25 posts
25 May 2020 5:32PM
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My SB Airborn 8.8


Black Sheep
25 posts
25 May 2020 7:03PM
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Select to expand quote
justaddwater said..

Black Sheep said..
A large fin box in an SB Airborne 8.8, would that be a good idea?
I recently bought an SB AB 8.8 2015 second hand, I had already tried an SB WP 8.10 and that quad fin but I didn't really like it.
I now also experience that with the AB 8.8, hence the plan to build a large fin box in it.
It has already been mentioned more on the forum here, but never the findings with this.
I just want to place the box back more than in the picture, just over the fcs box.




I would be doing it,I don't surf any board without a fin box,as I tend to like 2/1 set ups with a tight cluster,I was considering that board but declined for that very reason.Make sure the box is reinforced as there won't be any h/density pvcin that area go for it! That box placement looks ok as it is around the quad rear mark,what works for me consistently is a formula... put a straight edge across the tips of front fins transfer vertically down mark board,then your critical measurement to the front of Finn in the box is around1/4--1-1/4 I never go for ward of the mark!.regardless of changing fin sizes you will find your happy place in there somewhere.In my younger days I worked with some high profile shapers on log boards and this formula was consistent with them all.Having said that there always exceptions to the formula !,good purchase and good luck


Can you draw what you mean by... put a straight edge across the tips of front fins transfer vertically down mark board,then your critical measurement to the front of Finn in the box is around1/4--1-1/4

justaddwater
NSW, 184 posts
26 May 2020 10:18AM
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Select to expand quote
Black Sheep said..

justaddwater said..


Black Sheep said..
A large fin box in an SB Airborne 8.8, would that be a good idea?
I recently bought an SB AB 8.8 2015 second hand, I had already tried an SB WP 8.10 and that quad fin but I didn't really like it.
I now also experience that with the AB 8.8, hence the plan to build a large fin box in it.
It has already been mentioned more on the forum here, but never the findings with this.
I just want to place the box back more than in the picture, just over the fcs box.





I would be doing it,I don't surf any board without a fin box,as I tend to like 2/1 set ups with a tight cluster,I was considering that board but declined for that very reason.Make sure the box is reinforced as there won't be any h/density pvcin that area go for it! That box placement looks ok as it is around the quad rear mark,what works for me consistently is a formula... put a straight edge across the tips of front fins transfer vertically down mark board,then your critical measurement to the front of Finn in the box is around1/4--1-1/4 I never go for ward of the mark!.regardless of changing fin sizes you will find your happy place in there somewhere.In my younger days I worked with some high profile shapers on log boards and this formula was consistent with them all.Having said that there always exceptions to the formula !,good purchase and good luck



Can you draw what you mean by... put a straight edge across the tips of front fins transfer vertically down mark board,then your critical measurement to the front of Finn in the box is around1/4--1-1/4


Sorry mate I'm a dinosaur with technology,using your diagram put a straight edge across the tips of front fins,it will show that the fin box you have marked in orange protrudes forward of the line of the straight edge looks like about 1",if that fin box was actually there simply mark the box in that position then install your fin box fin into the box and use the formula(the distance between the mark on the Finn box and the font of the fin box fin and move around to find your happy place)formula being 1/4--1-1/4 again we are all different! By the way that box position you have drawn looks pretty good,taking into account most box fins have front screw tabs.Cheers.

colas
3906 posts
26 May 2020 1:53PM
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Some time ago, I convinced Gong to put 2 FCS boxes inline (and some other brands even copied it). It acted as a poor man fin box:
pro:
- lightweight
- can use any FCS fins
- can use symmetrical big keel fins, interesting setup for longboard SUPs
- easier to put in thin tails
- 3 fin positions with only 2 boxes
cons:
- cannot be fine tuned: only 3 positions
- not worth the trouble with FCSII boxes, most people with FCSII boxes will not want to use screws again. Gong didn't use this after switching to FCSII boxes.



My experiment for noseriding:




Quobba has an interesting "slider" concept for the center fin, that can be moved tool-less in the water, but with a limited range, and is not yet available.

Black Sheep
25 posts
29 May 2020 2:11AM
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thanks for the support, this is it









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"A large fin box in an Starboard Airborn 8.8" started by Black Sheep