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-   -   isonic 111 - trouble with back foot (http://www.star-board-windsurfing.com/forum/showthread.php?t=1308)

Guest 1st March 2007 06:53 PM

isonic 111 - trouble with back foot
 
hello Ian & Team,

I would like to ask you about your opinion in terms of a issue I have with the 111.

Usually I use my 111 with 7.8 and 8.4 fin size is between 34-36 SL2 Deboi.

My weight is around 222lbs and use the RS6-7 suite.

While I am sailing the usual setup for me is to put the boom @ max top level since I am tall 200cm

This allows me to (because of the high boom level) to lift the board onto his Lee Edge (sorry for the bad describtion).

My trouble is with the 7.8 sail and the 111 - due to the sail cut I cannot put the boom that high as with the other sails. And this result in too much pressure on the back foot. I tried already so much think - other fins different sizes, put the tracker fron and back.

Don't know if it will make a big difference to cut the protection stift out of the mast tracker.

Could you provide me some more tipps to resolve that issue ?

thxs, matt

Guest 1st March 2007 06:59 PM

RE: isonic 111 - trouble with back foot
 
.... I forget to mention that I do not have any trouble with my 133 and the 9.0 - 9.8 sails

thxs again

geo 1st March 2007 08:36 PM

RE: isonic 111 - trouble with back foot
 
I guess you are using small fins for that board and sail combo. Personally I (6'3"; 185) used a 34 Deboichet on a Sonic 95 with 7.6 and found it smallish; it will mate to a 7.0 for next season.
Of course, if your sail cutout is too low, setting the mast track all the way back could ease things a bit resulting in an higher boom position when sailing.

Guest 2nd March 2007 02:14 AM

RE: isonic 111 - trouble with back foot
 
i've been having lots of problems as well - i'm 197cm tall and using a 161, 122 and 101 and i've struggled all year (also with with RS6's). on the 161 with the 10.7 i cut the neoprene boom cut out faring to get the boom up - i've resisted cutting the 7.8 but i am rigging it with the mast base 2-4cm higher specified which leaves the sail sitting a bit high but gives me that extra bit of boom height

not ideal and i'm also still experimenting

i'm thinking theres discrimination against tall people this year!

Mike

geo 2nd March 2007 03:10 AM

RE: isonic 111 - trouble with back foot
 
Perhaps the best solution would be to change sails. Such shortcomings are intolerable for dedicated racing materials.

CarlosD 2nd March 2007 08:49 AM

RE: isonic 111 - trouble with back foot
 
Hi Matt,

I agree with Geo that probably you are using very small fins for your height/weight. I´m sailing my new IS111 mainly with a Code Red 7.7 and I found that the 36 cm fin is okay while sailing well powered (+ 14 knots) I am weighing 89 KG. (1,85 tall)
Since your weight is around 100 KG you would need more fin surface in order to obtain enough lift. (38/40 for the 7.8)
As you are using the boom in the highest position you are obtaining a high proportion of the lift throught the vertical component of force produced by the sail (wich is probablly too much leaned windward) this means that you are losing forward performance.
I guess that if you try to use the boom in a lower position, with long harness lines and a bigger fin your sailing performance will improve, not only with the 7.8 but with all your sails.
then you can trimm the straps and the mastfoot positions.
Here you can see the opinion of kevin Pritchard as regards boom height and harness lines (he is a tall guy too)

http://www.star-board.com/forum/viewthread.php?forum_id=8&thread_id=21277

http://www.star-board.com/forum/viewthread.php?forum_id=8&thread_id=21292

I hope this will help you, sorry for mi poor english :|.

Best Regards

Carlos

steveC 2nd March 2007 09:37 AM

RE: isonic 111 - trouble with back foot
 
Just to get a proper perspective on things, I think that one needs to decide whether they are trying to handle the biggest sail in heavier winds (for high speeds), or using a bigger sail to get the most out of the lightest of winds. Although there may not be that much difference in the size of the sail used, the size of the fin can be quite a bit different.

I'm not a big or heavy person, but for a number of years I was successfully using a 50cm Tectonics Mirage on an older course slalom (284cm x 61cm x 115 liter) with an 8.1-8.3 sail in light winds (12-18mph average) with no problem. Really, I don't find it surprising that bigger heavyweight guys using 36-38cm fins on 7.8-8.4 sails might find that they have real no low end and struggle with spinouts.

If one still wants to keep fin size small for a fairly broad range, I would recommend checking out Wolfgang Lessacher's 100% carbon asymmetricals. His smaller fins have this incredible resistance to spinout, particularly his weedfins. I can't really explain it, but tracking ability of his fins are simply amazing, especially pushing hard to windward.




mike 2nd March 2007 09:58 AM

RE: isonic 111 - trouble with back foot
 
Too much backfoot pressure? Sounds like you already have the boom high. Have you tried moving the universal to nearer the front of the mast track??

geo 2nd March 2007 01:07 PM

RE: isonic 111 - trouble with back foot
 
Poor guy. Our answers are pointing to different directions, and I guess are adding confusion to confusion.
Matt is such a big guy that probably the 111 + 7.8 combo is a 20 knots + setup for him. This could partly explain the use of smallish fins on such a big board. Nevertheless, at 200 cm and 100 kg, leverage power is such that it must be very easy to push too hard on the fin, expecially if one is seeking balance to sail railed.
Probably sailing style and stance are not to be overlooked. My guess is that the 111 (which I don't own or ride) could prefer to be sailed level, instead of railed. Maybe this does not show up in lighter winds but could be an instance at higher speeds (7.8). I do also think that with the mast forward one gets too much leverage which could be difficult to manage, while mast back requires more attention sheeting in but also does not lean towards excessive push on the fin.

Maybe someone who knows could make suggestions about the 111 character, if it is supposed to be sailed railed or flat. But beware: 2 meters tall + 100kg+ fast materials + correct stance + good setup... ind the end we could be generating a monster...

John1 2nd March 2007 07:07 PM

RE: isonic 111 - trouble with back foot
 
Yes, do as CarlosD says. I had the same problem with Hypersonic, Much backfootpressure and the "fronfoot feels like flying out of the strap.
TO do:
1 Lower the boom
2 More downhaul
3 The mast a bit more forewards
4 Frontfootstrap a bit more backwards if possible
5 ligth Flexion of the knee in the back leg
6 Extended frontleg

With regards,
JJ
JJ


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