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Old 7th December 2014, 11:52 AM   #1
Carve
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Default Speed fin for my Isonic 87 2013?

Hi!

I have the Isonic 87 wood 2013. I mainly use it with my Overdrive 6.2 and a Drake Ready to Race 34cm. It is super easy to sail and the times I have used a GPS I easy get +30 kts.
At one of my main spots we get pretty flat water with only some chop at the start end on a broad course even when the wind is 25-30 kts. I really want to see how high max speed I can get with the set up. If I should get a fin for pure speed which one should I get and how big?
My weight is 70 kgs.

Cheers
Asle
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Old 10th December 2014, 03:59 PM   #2
mark h
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Hi Asle

Quite a few iS87's have been used at my local for speed. General opinion on fin choice for the iS87 is that high wind slalom fins are faster than wide base speed fins. Something along the lines of a select vmax, f-hot or sonntage (and plenty of others) would give you very good speeds.

Size wise, I'm not the best to give you advise as I'm around 100kg. I do however use a 30cm and 32cm fin on my iS76 (similar to your is87). I would imagine that a 28cm and 32cm would be plenty at your weight and would be more than capable of achieving high 30's knots with ease.

Do you post results on gpsspeedsurfing.com?
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The toys:
Speed W44 - Speed W49 - speed W53 - speed W58 - iS76 - iS107 - iS137 - F161.
North Warps: F2012 5.2m, 5.7m, 6.3m, 7m, 7.8m, 8.6m, 9.5m F2006 11m.

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Old 10th December 2014, 06:40 PM   #3
Carve
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Thanks Mark!

I will have a look at the fins you suggest. It is good to know that I should go for a slalom type fin and not a wide base speed fin with that board. I will probably start with a 28 cm and see how fast I can go.

No, I have not posted results on gpsspeedsurfing.com. I have looked at it and am thinking about starting posting.

Btw, where are the best sources on the internet for getting tips and discussions about speed surfing?

Cheers
Asle
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Old 10th December 2014, 11:18 PM   #4
mark h
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I'll dig out a few speed sailing links and post them here for you
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Cheers - Mark H

The toys:
Speed W44 - Speed W49 - speed W53 - speed W58 - iS76 - iS107 - iS137 - F161.
North Warps: F2012 5.2m, 5.7m, 6.3m, 7m, 7.8m, 8.6m, 9.5m F2006 11m.

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Old 11th December 2014, 07:42 PM   #5
mark h
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http://boards.mpora.com/features/the...e0IzsPH9wcK.97

http://boards.mpora.com/technique/10...BQqAcdEjdXo.97

http://boards.mpora.com/technique/a-...G5V39QRPlc8.97


There's quite a lot on internet, but this stuff above is great reading, plus there both regulars at my local and they know their stuff. This morning, Farrell did 50k peaks
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Cheers - Mark H

The toys:
Speed W44 - Speed W49 - speed W53 - speed W58 - iS76 - iS107 - iS137 - F161.
North Warps: F2012 5.2m, 5.7m, 6.3m, 7m, 7.8m, 8.6m, 9.5m F2006 11m.

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Last edited by mark h; 11th December 2014 at 07:46 PM.
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Old 12th December 2014, 02:43 PM   #6
Carve
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Thanks Mark!!

Cheers
Asle
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Old 13th December 2014, 11:30 AM   #7
Carve
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Mark (and others)!

Do you have any knowledge of the Select Hot Rod? It looks more like a blade than the wide based speed designs, but still not like the vmax.

http://www.select-hydrofoils.com/en/...lalom/hot-rod/
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Old 14th December 2014, 07:01 PM   #8
Krister
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Quote:
Originally Posted by Carve View Post
Thanks Mark!

I will have a look at the fins you suggest. It is good to know that I should go for a slalom type fin and not a wide base speed fin with that board. I will probably start with a 28 cm and see how fast I can go.
I have the iS 76 (and iS94) and to me a 28cm will be too small. I would instead recommend something only slightly smaller than what you have, i.e. 30-32cm, to start with. Keep in mind also that when you go to a more slippery fin you get less lift (for a given length), and since these boards have a wide tail you do need lift from the fin to get the board properly out of the water. A board sitting deep in the water will be slow.

I will only go for a 28cm fin on the speedboards, as they have a much more narrow tail.
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Old 18th December 2014, 07:00 AM   #9
ThierryP
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Asle,

I am with Mark: a 28 elliptical-shaped slalom fin (e.g. Sonntag, Gasoil Elliptique, Deboichet Upwind) is the ticket. If you can source a Deboichet SL4 (they are super fast), then go for a 30 to 32 cm fin, because they don't give much support. You can always position the mast foot further back in case you feel that the board does not have enough lift.
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