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Old 30th April 2007, 03:19 PM   #1
ned_321
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Default Different technique required for isonic 101 for speed compared to traditional shapes?

Hi all,

I have the iSonic 101 and 87 - for speedsurfing.

I have a problem in getting the 101 up to my "normal" speeds.
Performance on upwind and beam reach is good. But somehow I cannot find 6th gear on this board when going for a downwind speedrun.
MaxGPS so far only 62.x km/h, which is very disappointing.

Sails: Gun XS 6.2 and 7.4. Fins: Lessacher B+F 35 and 38. Mastfoot: 132-133.


Now all tests and sailing reports state that the larger iSonics (101 and up) run very flat with the nose very low. Sailing characteristic is different from more traditional shapes (such as the 87).

Does this different sailing characteristic (flat, low nose) require a change of technique?
Upwind and beam reach speed is not problem. But where it counts - downwind speedruns - I have lost speed compared to my "peer group".
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Old 30th April 2007, 04:26 PM   #2
Marko
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Default RE: Different technique required for isonic 101 for speed compared to traditional shapes?

I am not so much into speed, more slalom racing but I found that this board is very different to former Sonic100/95.

I used the board only 3 times now (in very flat water) and I think that the key to good speed is to put very much downhaul in your sail. Then, the board will just fly on the fin with very light and slippery feeling. Everything will feel balanced. With not enough downhaul, board will be stuck to the water and you will have too much back foot pressure. My ex Sonic100 was much more tolerant to different sail trim but, on the other hand, is101 goes MUCH better thru lulls. It goes so good thru lulls that I also noticed I do not use adjustable outhaul so much any more.

By the way, my trim with 7.0 is everything in the middle with 36cm fin (deboichet sl2).
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Old 30th April 2007, 05:21 PM   #3
ned_321
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Default RE: Different technique required for isonic 101 for speed compared to traditional shapes?

Hi Marko,

Thanks for the quick reply.
I already apply lots of downhaul in my sails. Most speedies (including me) use more downhaul than prescribed (and a bit less outhaul). In my case +3 cm.

The board already runs free. On beam reach the speed is good. But on downwind, the board does not get into 6th gear. It goes faster than beam reach, but only a little bit. Not the ferocious acceleration I'm used to when you turn downwind from beam reach.
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Old 30th April 2007, 05:35 PM   #4
ned_321
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Default RE: Different technique required for isonic 101 for speed compared to traditional shapes?

Additional trim info: back and front strap both all the way back. Also tried back holes 1 to front, but then the board was less free.
No tailwalks even in strong wind (measured 18-25 knots; gusts up to 28) with 7.4 sail.
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Old 30th April 2007, 05:36 PM   #5
ned_321
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Default RE: Different technique required for isonic 101 for speed compared to traditional shapes?

Additional trim info: back and front strap both all the way back. Also tried back holes 1 to front, but then the board was less free.
No tailwalks even in strong wind (measured 18-25 knots; gusts up to 28) with 7.4 sail.
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Old 30th April 2007, 06:40 PM   #6
ned_321
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Default RE: Different technique required for isonic 101 for speed compared to traditional shapes?

By the way: how much tailkick is the IS 101 supposed to have?
My measurements (with metal ruler over finbox):
-absolutely flat until 1 cm from tail
-then 1 mm tailkick over last 1 cm (progressive curve)
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Old 30th April 2007, 07:00 PM   #7
Doby
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Default RE: Different technique required for isonic 101 for speed compared to traditional shapes?

I asked the same question about my 115 about a year ago, Ian Fox laughed at me....
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Old 5th May 2007, 08:54 PM   #8
ned_321
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Default RE: Different technique required for isonic 101 for speed compared to traditional shapes?

I hope Doby is not right, and that Ian is just away from internet access.

In the meantime, I have gotten reaction on the windsurfing33 forum. Advise was to put the mastfoot at 129-130. This is about as far back in the box as you can go. But I'm going to try it anyhow.

Here are 3 photos: 1 of the fin I use; and another of the mastfoot in 133 (current) and 130 cm (next time).

Lessacher B+F 35
<a href="http://photobucket.com" target="_blank"><img src="http://img.photobucket.com/albums/v642/NED_321/LessacherBF_35_DSC00002.jpg" border="0" alt="Photo Sharing and Video Hosting at Photobucket"></a>
http://img.photobucket.com/albums/v642/NED_321/LessacherBF_35_DSC00002.jpg

Mastfoot at 133
<a href="http://photobucket.com" target="_blank"><img src="http://img.photobucket.com/albums/v642/NED_321/iSonic_101_mastfoot_133.jpg" border="0" alt="Photo Sharing and Video Hosting at Photobucket"></a>
http://img.photobucket.com/albums/v642/NED_321/iSonic_101_mastfoot_133.jpg

Mastfoot at 130
<a href="http://photobucket.com" target="_blank"><img src="http://img.photobucket.com/albums/v642/NED_321/iSonic_101_mastfoot_130.jpg" border="0" alt="Photo Sharing and Video Hosting at Photobucket"></a>
http://img.photobucket.com/albums/v642/NED_321/iSonic_101_mastfoot_130.jpg
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Old 5th May 2007, 08:57 PM   #9
ned_321
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Default RE: Different technique required for isonic 101 for speed compared to traditional shapes?

Another try at putting photos in.

Lessacher B+F 35


Mastfoot at 133


Mastfoot at 130



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Old 11th May 2007, 09:17 PM   #10
Ronny
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Default RE: Different technique required for isonic 101 for speed compared to traditional shapes?

I would advise you use a 32cm fin if you want speed downwind .
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