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New Tribal Delta fins

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Created by aussieboats 24 days ago, 23 Jun 2018
aussieboats
NSW, 218 posts
23 Jun 2018 9:18AM
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The latest fins from Tribal fins have been getting great results so far and should see some nice speeds over the next few months











peterowensbabs
NSW, 41 posts
23 Jun 2018 10:56AM
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They kind of remind me of old surfing long board 'log' fins.

keef
NSW, 1992 posts
23 Jun 2018 1:08PM
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Fins looks great except the back of the fin is on the board and potential for some rear end damage to the board if you hit a solid object or fitting the fin if its a tight fit

aussieboats
NSW, 218 posts
23 Jun 2018 2:49PM
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tribal fins just fit into the boxs , i havnt had to sand one yet

keef
NSW, 1992 posts
23 Jun 2018 3:18PM
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not knocking the fins mark but i have made fins with an overhang and payed the price, these fins are made for shallow water and high speed if you hit a rock you can split the box aswell as the board , for me i would take 5mm off for a bit of insurance ??

keef
NSW, 1992 posts
23 Jun 2018 3:26PM
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Select to expand quote
aussieboats said..
tribal fins just fit into the boxs , i havnt had to sand one yet


Ive got a few boards and every box is different sounds like the tribals will fix the problem ??

pepe47
WA, 1089 posts
24 Jun 2018 9:57AM
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keef said..
not knocking the fins mark but i have made fins with an overhang and payed the price, these fins are made for shallow water and high speed if you hit a rock you can split the box aswell as the board , for me i would take 5mm off for a bit of insurance ??


Got a great deal of respect for the tribals, but I'm glad I'm not the only one who thought that!

pepe47
WA, 1089 posts
24 Jun 2018 12:38PM
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That's pretty much all it takes. A brief introduction to grumpy's rock and the weed is evidence that the front of the fin has lifted, meaning the trailing edge had to go somewhere. But, luckily the trailing edge has been tapered to cater for that event. When I get a tribal, that's what I'll be doing with the trailing edge.


choco
SA, 3295 posts
24 Jun 2018 2:12PM
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pepe47 said..
That's pretty much all it takes. A brief introduction to grumpy's rock and the weed is evidence that the front of the fin has lifted, meaning the trailing edge had to go somewhere. But, luckily the trailing edge has been tapered to cater for that event. When I get a tribal, that's what I'll be doing with the trailing edge.



Maybe it's time they released a long version tuttle box

forceten
309 posts
24 Jun 2018 10:44PM
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Picky here, but on first observation the Tribal fin is not a Delta shape. Its similar to MUF , weed

morts
WA, 102 posts
25 Jun 2018 5:47AM
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Thanks for the info, what size are the fin & board combo pictured?

aussieboats
NSW, 218 posts
26 Jun 2018 7:46AM
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So far the 14cm fin has been used in 70 litre speeds boards
the 16cm 80 litres - 90 litre boards

Iam getting a couple of 12cm made at the moment to use in the 61 and 71 patrik speed boards

morts
WA, 102 posts
27 Jun 2018 10:27AM
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Thanks AB

Wonder what potential performance loss there would be if you put some form of cutout at the base of the trailing edge.

BSN101
WA, 1194 posts
27 Jun 2018 2:09PM
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morts said..
Thanks AB

Wonder what potential performance loss there would be if you put some form of cutout at the base of the trailing edge.


Dont hit anything and you wont need to stuff one up.
They seem to be using smaller ones than you would use if using a delta, they must be good.
Anyone done GPS with them and have a speed potential comment? Without other fins in the results.

I need one!

keef
NSW, 1992 posts
27 Jun 2018 5:17PM
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pepe47 said..



I would imagine a bevel as in pepe's fin above would be contributing to somthing like a cut out

Stretchy
WA, 340 posts
27 Jun 2018 5:36PM
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keef said..

pepe47 said..



I would imagine a bevel as in pepe's fin above would be contributing to somthing like a cut out


Pepe is onto it, no brainer....

BSN101
WA, 1194 posts
27 Jun 2018 5:54PM
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Stretchy said..

keef said..


pepe47 said..




I would imagine a bevel as in pepe's fin above would be contributing to somthing like a cut out



Pepe is onto it, no brainer....


Cut out & spin out?

MartinF2
QLD, 445 posts
27 Jun 2018 10:42PM
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BSN101 said..

Anyone done GPS with them and have a speed potential comment? Without other fins in the results.

I need one!


Proof of concept: gpsteamchallenge.com.au/sailor_session/show?team=20&date=2018-06-17
Cheers
Marty

BSN101
WA, 1194 posts
29 Jun 2018 9:23PM
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MartinF2 said..

BSN101 said..

Anyone done GPS with them and have a speed potential comment? Without other fins in the results.

I need one!



Proof of concept: gpsteamchallenge.com.au/sailor_session/show?team=20&date=2018-06-17
Cheers
Marty


Yep saw that but what speeds with the Tribal? He used a few fins & boards

elmo
WA, 7720 posts
29 Jun 2018 9:32PM
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Sammy's PB NM on one of them, he was well happy with the fin

gpsteamchallenge.com.au/sailor_session/show?team=2&date=2018-02-02

That's some seriously dense weed down at Albany with lots of drag.

aussieboats
NSW, 218 posts
9 Jul 2018 8:13AM
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gpsteamchallenge.com.au/sailor_session/show?date=2018-07-08&team=20

Cams pbs on the Tribal fins , the new Delta is working a treat




BSN101
WA, 1194 posts
9 Jul 2018 12:12PM
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aussieboats said..
gpsteamchallenge.com.au/sailor_session/show?date=2018-07-08&team=20

Cams pbs on the Tribal fins , the new Delta is working a treat





If Dr Cam was on a delta what size would he have used?

Just interested to see size comparison so i can workout what size to get

aussieboats
NSW, 218 posts
9 Jul 2018 2:36PM
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18cm maybe 20 cm

pepe47
WA, 1089 posts
9 Jul 2018 2:40PM
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I thought I just read 16, with an evo 9 (6.4) and an iso 80. If that's right I might be looking at an 18-20 for a 90 litre board? Depending on the sail of course.

AUS4
NSW, 892 posts
9 Jul 2018 4:40PM
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aussieboats said..
18cm maybe 20 cm


Is there weed were he is sailing?

Dezza
NSW, 534 posts
9 Jul 2018 5:54PM
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Just rocks

firiebob
WA, 2787 posts
9 Jul 2018 6:40PM
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AUS4 said..

aussieboats said..
18cm maybe 20 cm



Is there weed were he is sailing?


It was 16cm, Cam's looking more for clearance.

aussieboats
NSW, 218 posts
Yesterday , 17 Jul 2018 8:00AM
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There was some advice about changing the trailing edge so the next shipment of fins will have the gap at the back of the fin so if you do hit really hard it wont impact on the fin box .
Also the fins will size down to 10cm for any keen sailors to go that shallow , i have 12cm coming for the little speed boards will post results as soon as we get a chance to try them .

Ian K
NSW, 2681 posts
Yesterday , 17 Jul 2018 10:28AM
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aussieboats said..



There was some advice about changing the trailing edge so the next shipment of fins will have the gap at the back of the fin so if you do hit really hard it wont impact on the fin box .
Also the fins will size down to 10cm for any keen sailors to go that shallow , i have 12cm coming for the little speed boards will post results as soon as we get a chance to try them .


I remember back when speed board fins broke through the 20 cm barrier. Mathew noted it was moving towards the field of tribology.

10 cm !! There's not far to go now!


L. Burstein, in Tribology for Engineers, 2011
3.3
Regimes of lubrication
With regard to lubricant film thickness between surfaces in relative motion, four regimes can be recognized: hydrodynamic, boundary, mixed, and elastohydrodynamic. The parameter usually used for characterizing these regimes is the ratio of the minimal film thickness h to the asperity height Ra.

en.wikipedia.org/wiki/Stribeck_curve

jimbob SA
SA, 880 posts
Yesterday , 17 Jul 2018 12:59PM
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aussieboats said..



There was some advice about changing the trailing edge so the next shipment of fins will have the gap at the back of the fin so if you do hit really hard it wont impact on the fin box .
Also the fins will size down to 10cm for any keen sailors to go that shallow , i have 12cm coming for the little speed boards will post results as soon as we get a chance to try them .


Really have a good think about sailing in shallow water and decide if the danger is really worth it just to get a number, would like to sail with you guys again.



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"New Tribal Delta fins" started by aussieboats