New Tribal Delta fins

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Created by

aussieboats > 9 months ago, 23 Jun 2018

aussieboats

NSW

342 posts

23 Jun 2018 9:18am

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

497 posts

23 Jun 2018 10:56am

They kind of remind me of old surfing long board 'log' fins.

keef

NSW

2016 posts

23 Jun 2018 1:08pm

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

342 posts

23 Jun 2018 2:49pm

tribal fins just fit into the boxs , i havnt had to sand one yet

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

2016 posts

23 Jun 2018 3:26pm

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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

1382 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

1382 posts

24 Jun 2018 12:38pm

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

4177 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

1312 posts

24 Jun 2018 10:44pm

Picky here, but on first observation the Tribal fin is not a Delta shape. Its similar to MUF , weed

morts

189 posts

25 Jun 2018 5:47am

Thanks for the info, what size are the fin & board combo pictured?

aussieboats

NSW

342 posts

26 Jun 2018 7:46am

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

189 posts

27 Jun 2018 10:27am

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

2378 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

2016 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

1045 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

2378 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

484 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

2378 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

8879 posts

29 Jun 2018 9:32pm

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

342 posts

9 Jul 2018 8:13am

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

2378 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

342 posts

9 Jul 2018 2:36pm

18cm maybe 20 cm

pepe47

1382 posts

9 Jul 2018 2:40pm

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

1291 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

955 posts

9 Jul 2018 5:54pm

Just rocks

firiebob

3177 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

342 posts

17 Jul 2018 8:00am

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

4164 posts

17 Jul 2018 8:28am

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aussieboats said..

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

1000 posts

17 Jul 2018 12:59pm

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aussieboats said..

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.

Steve Charles

QLD

1240 posts

18 Jul 2018 5:20pm

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jimbob SA said..

aussieboats said..

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.

Good point Jimbob. One catapult in ankle deep water and you could be permanently in a wheelchair or worse......

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