Re: [RCSE] Carbon fiber reinforced spars

[Harley Michaelis]

Wes. . .it will be easiest to work with the rigid, pre-made laminated spars. 
They come in several lengths, widths and thicknesses. If this is a 2M RES 
the .014" thickness should be fine. If somewhat larger, a bit thicker would 
be better. You do want these to be flush with the top and bottom of the 
wing, so will have to deepen the spar notches in the ribs to accommodate the 
thickness of the CF spars. if it is that kind of construction. You should 
also get the Kevlar thread from CST for wrapping around the spar system to 
keep things together.

File 3 of the Genie pages at http://genie.rchomepage.com/ has pix and text 
in it about CF spar use, attaching, wrapping, weighting down, etc. This file 
is going to be updated again shortly, so check it out again in a couple of 
weeks.

----- Original Message ----- 
From: "Wes Gibson" <[EMAIL PROTECTED]>
To: "RCSE" <soaring@airage.com>
Sent: Sunday, January 23, 2005 8:27 PM
Subject: [RCSE] Carbon fiber reinforced spars


Building a new woodie RES and this time I want to reinforce the top and
bottom spars with carbon fiber. I've been looking over the CST and 
Aerospace
Composite Products web sites ending up with more questions than answers. I
know I should use unidirectional carbon fiber, but what's easier to use:
tapes or tow? What thicknesses are recommended? I don't have a vacuum
bagging system, so I'll have to use old fashion phone books to weight the
stuff while the epoxy dries. I did find an informational article by Bob
Vixie which helped out a lot, but he didn't talk about thicknesses. 
Anyway,
what does everybody recommend out there.

Wes Gibson
AMA 607029
LSF 7533
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