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From: Gregory J. Mitchell (grmitche@cisco.com)
Date: Fri 30 Jul 1999 - 01:00:12 BST
Kendall Oblak - San Jose, CA - is Ernie's Source of pre-preg. Bryte Technologies is the source of 180 degree f carbon pre-preg
<p>I'll agree that a lot of the boats are at 165, and we need to take time and be gradual in weight reduction.
<p>I'm not very familiar with swing tests - other than the Finns hated theirs at the worlds due to the ever present breeze, and they were in a garage with a door - it took quite awhile.
Same with all up weights - people will still try to get their CG as low as possible - imho carbon rigs are a perm fixture - until we get something even stronger.
greg
<p>At 03:14 PM 07/29/1999 -0700, you wrote:
>
>On Thu, 29 Jul 1999, Gregory J. Mitchell wrote:
>
>> With the new low temp pre-pregs - the home builder can build an even
>> lighter boat. The Aussies have been building 145lb boats at home for
>
>Haven't heard of low temp pre-pregs before. What's the cure temperature?
>What's their relative cost compared to room temperature cure systems and
>dry cloth? I know there are some systems out there for 250F cure. That
>would still be a stretch for the home builder, let alone the possible
>problems with distortions after cooling. Also 250F is about where most
>foams go seriously soft.
>
>(interestingly, I talked to a prof in materials sience a while ago and he
>was telling me about new prepregs with 800F cure. He didn't give those
>much of a future though as thermal stresses after curing and cooling down
>can be tremendous.)
>
>> The amount of lead the new boats, home and pro built have to carry
>> would be comical if it didn't have such a negative effect on
>> performance.
>
>I think you will always see a comical amount of lead in a boat build by
>somebody trying to push their luck. The fleet needs to keep an eye on how
>sturdy the boats are as well. If there was a swing test, the fleet could
>promote sturdier boats at lower cost.
>
>If everybody agrees that 145lbs is within the technological range of the
>amateur builder maybe the fleet should go for it, or 150 or better yet 66
>kg. But since there are plenty boats out there that are 165 this should be
>at least 2 years down the road. Also when the weight gets changed the way
>its measured should be as well. Weigh everything but the blades and
>sailors!
>
>R!
>
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