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-   -   ISonic 90 speed fin. (http://www.star-board-windsurfing.com/forum/showthread.php?t=13309)

danisfeir 28th August 2011 03:27 AM

ISonic 90 speed fin.
 
Hi there!
I just got the 2011 Isonic 90 carbon, i use this board with a TR6 6.3 and 7.0 with a Tectronic Talon 34 and Vector fin 36.
I would like to buy a speed fin for some GPS run any suggestion please.
Thank you Dani.

mark h 28th August 2011 08:26 PM

Not the team here. Iv'e been using the Tectonic Nomads, very nice and easy for speed. For the new "wide base" speed fins, you can go pretty small, IE 21cm wide base feels more like a regular 25/26cm speed fin. The OFO on the iS90 is about 41cm, so a 27cm or 28cm Nomad will be good for you.

Vector Delta, C3 Slingshot and Curtis Speedfire are pretty similar and worth checking out. I did have C3 Slingshots, but prefered the feel of the Tectonic Nomads thicker tip.

danisfeir 28th August 2011 08:57 PM

Thank you Mark!

IRL-250 29th August 2011 07:01 AM

Not the team but have been using the Vector Maui Fins Delta Speed 27cm & 29cm on my iSonic 86 and they work great on the board and as the 86 is very close in size to the 90 they would work great on your board also.

Hope this helps

danisfeir 29th August 2011 11:54 PM

Thanks IRL-250
I have one more question for you IRL how do you like the KA Sail Koncept, is it easy to rig do I need a KA mast for this sail or I could use any 100% carbon?
All my race sail are MauiSail Tr 6 and Tr7.
Thank you again.
Good sailing Dani.

IRL-250 30th August 2011 01:30 AM

I love my KA Koncept's and prefer them to the KA Race :-) They are very easy to rig, powerful on the water while feeling light in your hands and the cams rotate like they are not there.

You can use a wide range of of mast on the KA Koncept. Obviously the KA Mast is the optimal mast for the sail but Other brand masts are suitable if they have the correct IMCS and an IMCS bend curve percentage in the range of 13-14% (or slightly out either side from this range) which is constant curve to slightly flex top. You can see info mast bend curves here

http://peterman.dk/masts-all-imcs01.htm

and here

http://peterman.dk/mast-imcs-formulas.htm

I have used Neil Pryde, Tushingham, Fiberspar, North Platinum & Sailworks masts on the sails and they all work fine but if you have Maui Sails masts they will definitely not work. I experimented with a Gaastra mast which has a similar bend curve to Maui Sails masts just to see how the Koncept rigged and felt on the water and the sail felt gutless with the sail way to flat in the bottom of the sail and the leech was was too loose so the sail was loosing power so if you were to switch to the Koncept's you would have to change your sail over.

Where are you based as you might be able to meet up with a KA ambassador and try the sails out?

Hope this helps


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