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From: Rainer Leuschke (rainer@u.washington.edu)
Date: Thu 29 Jul 1999 - 23:14:41 BST
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!
-- ,--+___.
,/ | \
___ / | \. Rainer Leuschke
__ / | \. phone: (w) 206-685-0900 ,
__ / 14 |\ \ (h) 206-524-7887 |\ __
| ~~ | \ USA \ | \ __
| | \ 1111 \ | o\ -
| | \ \ Weight is only of use |~U'\
| | \ | in steamrollers. |/(-'
+--o o--| \ | - Uffa Fox `------;-
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