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-   -   q f remi or ian heavy isonic wood/carbon??? (http://www.star-board-windsurfing.com/forum/showthread.php?t=6787)

erik 3rd September 2009 02:56 AM

q f remi or ian heavy isonic wood/carbon???
 
Hi,

I bought a isonic wood carbon 121 today, board looks great.
When i picked it up it didn't feel very light, so i picked up my 2009 wood 133 and it was lighter????
I put the 121 on the scale and it weight (without footstrap) 7.1 kg. On the site the weight of a wood states 6.9 kg.
So my 122 carbon ways to much. i thougt that a carbon suposed to way at least 0.6 kg lighter to have an advantage over wood in light conditions?
Good there be a production error?

greetings from holland,

erik

Vando 3rd September 2009 06:42 PM

Quote:

Originally Posted by erik (Post 34743)
Hi,

I bought a isonic wood carbon 121 today, board looks great.
When i picked it up it didn't feel very light, so i picked up my 2009 wood 133 and it was lighter????
I put the 121 on the scale and it weight (without footstrap) 7.1 kg. On the site the weight of a wood states 6.9 kg.
So my 122 carbon ways to much. i thougt that a carbon suposed to way at least 0.6 kg lighter to have an advantage over wood in light conditions?
Good there be a production error?

greetings from holland,

erik

Hi Erik I had the IS122 wood last year and I now have the Carbon 121 it defiantly feels lighter than my old 122.

Ian Fox 5th September 2009 04:49 AM

Hi Erik,

It would seem unlikely that a 2009 Wood 133 would weigh under 7.1Kg - and if it did (does) then it certainly is well UNDER the weight tolerance range of the 133.

Regarding the weight difference with Wood+Carbon (in 121 size) the saving is typically about 400-500grams - and the performance difference is achieved not only by weight reduction but also by the more direct structure of the carbon board (in the lighter wind/flatter water conditions range).

As you will be aware, there is a certain weight tolerance range on all boards that are produced, (typically +/- 5% ) and usually in turn based on an average weight (which is often determined only after a certain qty of each size/type has been produced in order to confirm a true "average".

The Wood+Carbon is a premium product ; should you be unsatisfied with any asect of your purchase, please refer (in the first instance) thru your supplying dealer (or importer) for their check/investigation and resolution.

Cheers ~ Ian

erik 6th September 2009 12:31 AM

for ian
 
Hi ian,

thank you for your, as usual , very analistic answer.

I went to importeur holland and they had another board 121 carbon that was 6.4 kg instead of the 7.1 kg. I can switch the boards so i am satisfied.

what can be the cause of such (big ?) weight diffrences??

Greetings from holland,

erik

Floyd 6th September 2009 05:18 AM

Not on team but I read somewhere that biggest variation in weight of boards is in foam ;the foam can be more/less dense according to temp/pressure on day its produced. Obviously manufacturer can control temperature but cant control ambient (air) pressure.
(ie I believe high pressure days cause a more dense foam; since size is constant (relatively) the change in foam density produces the slight variation in weight. (Lay up resin/carbon/kevlar/wood etc will be very tightly controlled)

??????????????

Screamer 6th September 2009 06:37 PM

Quote:

Originally Posted by erik (Post 34830)
Hi ian,

thank you for your, as usual , very analistic answer.

I went to importeur holland and they had another board 121 carbon that was 6.4 kg instead of the 7.1 kg. I can switch the boards so i am satisfied.

what can be the cause of such (big ?) weight diffrences??

Greetings from holland,

erik

Most mfg's allow for 5-6% difference (from what I've measured in the past it was always less than that), but in your case it's more like 10% for a 7kg board. Way too much.

Good you've exchanged it.

ThierryP 3rd January 2010 09:19 PM

On the French Forum, Christine has measured the 2010 iSonic 121 woodcarbon at 150 grams heavier than the 2009 wood. Not a lot more, but then there is the small matter of the extra $$$ we pay for the exotic and supposedly lighter material.

davide 3rd January 2010 11:10 PM

Quote:

Originally Posted by ThierryP (Post 38085)
On the French Forum, Christine has measured the 2010 iSonic 121 woodcarbon at 150 grams heavier than the 2009 wood. Not a lot more, but then there is the small matter of the extra $$$ we pay for the exotic and supposedly lighter material.

I suppose that what matters is not so much the weight (a 6oz fabric is a 6oz fabric, no matter if glass or carbon, and there are just so many ways to layer a sandwich board, go 4.4oz carbon vs 6.0z glass and you save what ... 80 grams?) but the ride characteristics that a material might produce.

Besides, I really believe that plus minus one Kg is irrelevant when the total package (board, sail, rig) is anywhere between 90 and 150 Kg. Try, put a 1Kg weight in front of your straps and try to spot a difference!

nonopr 4th January 2010 12:12 AM

No matter what material is used. This are production boards and they tend to be overbuilt a little to sustain abuse for years, when the contratry on a custom carbon board.
If you want a board that is super light weight then go to a custom board.

Remi 6th January 2010 04:49 PM

Hi All,

The production have a tolerance of 5% but also the volume of the iSonic 121 increase compare to last year, so more material = more weight. Anyway the average weight is 6,56 and last year was 6,85 with 5 liters less, so can be max 6,88 or min 6,23.

iSonic 94 2009 : 92 l / 2010 : 91 l
iSonic 101 2009 : 97 l / 2010 : 100 l
iSonic 111 2009 : 110 l / 2010 : 111 l
iSonic 122 2009 : 113 l / 2010 : 118 l
iSonic 133 2009 : 127 l / 2010 : 129 l
iSonic 144 2009 : 137 l / 2010 : 137 l

All the best


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