View Full Version : Isonic 111 speed
1st April 2007, 03:28 AM
I have an Isonic 111 and have been absolutely amazed at the ease of sailing it. It is really confortable, it planes relatively early and is quite intuitive to sail.
But... with the larger fin I am finding it is not that quick. In fact, I am struggling to get it over 28 knots with a 7m sail. I am quite convinced that this has everything to do with me and very little with the board, but have also started to worry about the fin. The larger stock fin (42cm) is the only one - it seems - that isn't a Deboichet shape and perhaps this has something to do with its performance.
With the larger and smaller Deboichet fins both my Is 97 and 133 absolutely fly! So why doesn't the Is 111? Have I overfinned it with the 7m and 42cm fin?
Any tips welcome
1st April 2007, 04:15 AM
Hmm. I would guess you have been using the wrong fin. On my iSonic 105, I put an 8.0 on it with a 40cm fin. Have you tried the smaller fin yet? You might not get up on a plane as easily, but once powered up, I would think you'd do fine. When I'm really powered up, I'll use my 34cm fin with the same 8.0.
1st April 2007, 03:16 PM
I'm pretty interested in that as I'm just waiting the 111...
In my opinion you have to consider that 30 kns speed wall it's not so easy to overtaking and one important factor to better understand your feeling is how much wind did powered you in that case.
When it comes to fin lenght related to board/sail combo a very important thing to think is to know if you wanna blast or what else.
Thinking at purchased fins,please,consider that they are supplied for keeping the wider wind/sail range possible so,maybe,it didn't match the condition you've found.Plus,I think,you can't expect too much in top range performance by these fins.
If you wanna reach a high speed in 7,0,according on what Remi suggested,you should try a Debo sl2 36 and use a cambered sail.
1st April 2007, 10:23 PM
It of course might be the fin and you can of course try thowing money at it (other fins may definitely be faster).
Have you already passed the 30kts with a different board or is this your first attempt to.
If its your first attempt you will have to get used to going that fast and improve over time.
If you already are used to travelling at 30+ Kts I would still give it a few goes before throwing money at a fin.
To be fast YOU have to be fast. Good equipment will make it easier but it is still YOU that makes it happen.
1st April 2007, 11:33 PM
As a recent owner of an Isonic 111 (sailed 6 sessions) I can say that the 42 cm fin is not suitable for speed while powered with a 7.0 sail . I use the 111 with a 7.7 Severne code red sail in the 12-18 knots range with the stock drake 360 fin (good upwind performance, no spinouts, high downwind speed).
The max gps speed I measured is 31 knots in far from ideal speed conditions (gusty-medium chopp).
I guess that for a 6.7 or 7.0 sail, when powered at the 15/20 knots range the ideal fin size is between 34/36 cm, and a skilled sailor would reach 34/35 + knots in flat water.
As your IS111 comes equiped with both fins (42 and 36) you can try this without buy a new one for the first trials, then you can try:p:p more speed dedicated fins in order to improve your results.
Please tell me your experience later :p.
3rd April 2007, 07:54 PM
my top speed with iS111/42/SSR7,6=32,5kn. I am 92kg and 184cm. Because of the wide tail(49,2cm) the iS111 works never with the small 36cm fin. It needs lift from the fin to plane free and adjustments to ride it mainly with the back feet. Pull down your sail for more loose leech, rise the boom until you have main press on the back feet and position the power joint in the middle of the box. Have fun!!:o
3rd April 2007, 08:54 PM
So Peter what's in your opinion the smallest sail/fin that the board can match at 85 kg ? 6,7 and 38 sl2 ?
If so I presume that a 42 will match good the 7,8....
I'm still waiting a bit for placing the order of the fins....
4th April 2007, 04:48 AM
Sorry, I don't agree with Peter here but I think we are talking cross purposes. My experience is that the 36cm works absolutely fine in higher winds. I just need to work out when to start using it and I have a feeling that the 36 is actually better matched to the 7m sail than the 42.
Outright speed is affected by the size of the fin (but of course limited by the size (width) of the board). In 20 knots I can still hang on to my 7m with ease but the Is 111 with the 42 fin has become uncontrollable. To much lift means it starts to tail walk and in some cases literally takes off. The answer is to fin down, which is fine if you are looking for outright speed, because you are by definition sailing off the wind.
Anyway - the real question is whether the 42 stock fin is holding the board back? I still feel that it might.
4th April 2007, 02:10 PM
To me its seems pretty obvious that a 42 cm. fin is holding you back with a 7.0 sail.
What fin/sail combos do you use on the 94?
4th April 2007, 03:55 PM
Fin cm lenght is not the only parametre to watch.Don't forget cmq of it.And,what about profile?
If we speak of sl2 on 7,0 anything from 38 to 42 will work.
4th April 2007, 05:08 PM
Way too large a fin for pure speed
You can use much smaller.
Speed sailing - the fin is crucial.
I use a Falcon 2005 90litre (60cm width) with a 26/28cm fin for downwind - Max GPS on this board 38.5 knots in Choppy/Flat water.
Simon Hinkley Recently used the 105 Isonic with 32/34 fins and was hitting peaks of 33/34 knots at choppy marazion with a 7m.
4th April 2007, 07:11 PM
maybe I should say that 38-42 is a SLALOM RACE combo.For speed reach in a long leg a smaller one should help but you can't go too much smaller as the board start to become less controllable and more sensible to chop and/or gusts.Spin out is just around the corner and the final result will be not so far forward......
4th April 2007, 10:21 PM
Just finished tu put on the footstraps (soft and light) on the board.Till now I haven't seen any 2007 isonic so I was pretty curious.
From a first sight the volume seems well balanced.The tail is very wide (for the given board volume) and relatilely thin but what I like so much is the wingers system for a better water release while blasting on the fin.It should balance the wide o.f.o. .
Scoop-rocker line seems straight while the board lays in the floor but it means NOTHING till the tail isn't charged with the feets into the footstraps!!
Med weight rated.
Hope to give a test as soon as possible.
16th April 2007, 07:49 PM
My last and highest top speed on the iS111 / SSR7,6 / orig. 42cm is 64,2km/h (35kn). Wide tail needs correct fin length. Usually fins should be 5-9cm shorter than the "one foot off" dimension. Tail of the 111 is 49,2cm so matching fin sizes in normal slalom dimensions from 40-44cm. Off course you can ride smaller fins for better control and comfort but than you will not be fast and should better bye a freeride board.
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