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Thread: Slotbox protection
16th February 2017, 10:30 AM #1
- Join Date
- Jul 2004
With the addition of a third twin finned board with slot boxes my damage percentage on said fin system has dropped from 75 to only 50 percent. I want to keep it that way!
I do not want to discuss whether slot is worse than other fin box designs or if some brands use worse slot boxes than other. What I want is ideas on how to increase the likelyhood of a slotted fin just hinging back on impact without ripping out screws or worse.
To achieve this I am willing to give up both the ability to change fins easily and to place the fins wherever I want in the box. My intitial thinking goes like this.
Firstly, the chance of having the fin hinge back on impact is bigger the closer the rear end of the fin base is to the rear screw. This spot can be identified by just tightening the rear screw very loosely and sliding the fin forwards until it stops. With my two sets of fins this brings them far forward in the box and give a skatey feel which is ok.
There is however the question of whether the fin will just slide back on impact before hinging. A possible solution would be to cut a piece of blanking material and fix it at the rear of the box as a stopper. Perhaps rounding it off a bit at the end that sits next to the fin could help the fin pivot. On the other hand a bit of sliding may work as shock absorption, and I have not so far damaged the rear screws on my boxes.
Lastly there is the question of how to keep the fin in place at the front. Regardless of what others may think or say I do not trust the screw. It will easily rip out. The better the screw sits in the box the more likely it is to take a large chunk of the box with it.
What I am therefore looking for is some sort of glue, maybe tech7, that could be applied intelligently at the front to keep the fin in place during sailing but also to yield upon harder impact to let the fin hinge back on the rear screw. My initial feeling is that the glue should or could be applied to the part of the base that sits right opposite, in other words the other side of the fin base, of the front screw. I plan to tighten the screw to get the fin in place but then loosen it significantly when the glue has cured. An argument for applying the glue to the side of the fin base or box is that it would be easier to remove if so needed. I do not want a big mess down in the box.
Last edited by boards_Tomas; 16th February 2017 at 10:47 AM.The infamous wavewriter
16th February 2017, 05:40 PM #2
I wouldn't glue it. What type of threads are on the grub screws? Are they removable?
If they are standard set screws, then you could buy different types to increase or decrease hold. For instance you can by cupped or pointed tips for max bite, or rounded or even spring loaded tips to allow release. You may even be able to get plastic versions. All this is mute of course if they are self tapping or captive screws...
16th February 2017, 08:06 PM #3
- Join Date
- Jan 2014
One thing I have noticed a lot with those that sail multi finned boards is they seem to take a lot less care coming in. With a single fin it is so hard to judge the depth with any accuracy that people tend to get of early and walk in. With multi finned boards people seem to ride a wave in that little bit too far more often than not. On a typical day at some spots I see people mashing fins on the bottom more and more. One chap ripped out two fins at the start of a session and a third gybing close to the shore later on. So with multi finned boards, we have 2, 3, 4 or even 5 times as many fins to wreck and we seem to be taking more risks with them
17th February 2017, 12:27 AM #4Main boards: Flare 101, NuEvo 86, UltraKode 80, Reactor 82, NuEvo 73. Powered by Severne Blades and S1s.
17th February 2017, 05:43 PM #5
- Join Date
- Jul 2004
Rounding the tips of the screws would probably help. As would sanding down the edge of the indent in the fin base. None of my five pairs of slot fins have been sitting tightly in any of their boxes in the three boards. So unless I use some sort of glue I will resort to packing tape.
You may have a point that multies tempt people to sail further into the shallow. I'm often amazed how people in Pozo (mostly tourists on rental boards I guess) stay in the straps and sink the tail until they touch bottom. I don't.
I have checked the bases on the fins that chattered my boxes. It's hard to say but it seems they didn't slide back much before pivoting. And that's even though they made huge holes around the front screw inserts. So I guess that as long the fins are placed pretty far forwards there's no need to devise any kind of stoppers. My only goal is to make the boxes more impact resistent. As I have two nice pairs of fins it would be good to keep the possibility of easy change.
Last edited by boards_Tomas; 17th February 2017 at 05:45 PM.The infamous wavewriter
18th February 2017, 03:47 PM #6
- Join Date
- Nov 2006
- nice house with horses, cats dogs, and bride. USA
the Slotbox when introduced , on theses pages was critiqued extensively. At that time the weakest part was the screws. Since then variations have been made to strengthen them, now the Starbox, from Starboard.
i must admit that my feelings were likewise, screws likely to be progmatic .
for the purpose intended the slot box has been strong. I have removed one pair, after a faulty install, and they were strong.
your issue, is trying to fix something that wasn't considered, as posted here, all the things they wouldn't do, I suggest the same, nothing.
K4 Fins 4Boards TRI-sails Sailrepair
19th February 2017, 07:15 PM #7
quick forum search on Slotbox:
edit - missed this answer:
Last edited by chrispavlo; 19th February 2017 at 08:23 PM.