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Re: ? Problems with CF Spider;Was Re: [ATM] Thin Titanium Spiders & Diffraction Spikes

What advantages do you see for a CF spider?  It
certainly would have low thermal mass, but I doubt it
will be as stiff as you hope.  Carbon-epoxy has high
stiffness for its density, but you'll probably have to
laminate it pretty thickly to match the stiffness of
conventional steel vanes. (I haven't looked
systematically, but having played around with single
and double layer BID CF it doesn't seem as stiff as
the same thickness of steel.)  There may be a weight
advantage, but I suspect matched stiffness for
thickness steel has the advantage.  (OK I admit I am
being lazy here--if I had my materials tables handy it
would be easy to check up on all this.)

If you go the CF route you may want to consider
unidirectional cloth--the vanes are loaded primarily
in tension, and the weft of the BID isn't going to
help you much in that case but will add thickness to
the weave.

Ross


		
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