RE: [ATM] Carbon Fiber for Spider Vanes

[Douglas S Angle <Douglas.S.Angle@can.dupont.com>]

> So the fiberglass part is heavier and when all costs are 
> determined, it is very similar to the cost of using carbon fiber.  This 
is 
> only true when you are holding a specific strength or stiffness, so that 

> both have to reach the same value, apples to apples, in other words. 

I've been following this thread with some interest, and have considered 
fiberglass/foam occasionally, but haven't actually used it yet.  One thing 
I that holds me back is concern about lateral strength.  For example, if I 
made upper cage rings from carbon and foam, I understand that I can build 
them stiffer and lighter than plywood, and they should perform well in 
use.  Now what happens when I'm setting up and bump the cage against the 
ladder.  Plywood takes a pretty good hit without damage, and a fair amount 
of damage without losing strength.  If I have a thin composite layer over 
foam, I would think that it will damage easily, and that this would have a 
big effect on the overall strength.  Do I end up destroying the whole 
piece because of a small hit?  Would I be better using glass instead of 
carbon, and making the laminations thicker anyway?

Thanks,
-Doug


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