>From: Michael Martz <[EMAIL PROTECTED]>
>
>On the LE I'm having to sand too much glass off to get the airfoil shape
correct
>and I'm eposing the wood in some places. I'm getting a pretty good
>sized lip of epoxy where the mylars end as well. I thought the bag
>would suck the glass in pretty tight and leave nice even edge but the
>glass gets twisted up sometimes along the edges.
>
>Maybe one idea is that I should make the mylars meet very close
>together on the LE? right now the gap is about 1/2 inch but I
>thought that was normal. I'm using the mylars that ACP reccomends
>(not sure of thickness).
I cut the mylar to the wing chord size with the idea that the airfoil
curvature will pull the mylar back from the LE. I just pulled a 37in wing
out of the bag yesterday and I had about a 1/16th of an inch to sand to form
the LE. As for the lip of epoxy, I got the idea from someone on RCSE (I
can't remember who to thank them), to taper the edges of the mylar to little
or no thickness. The bag comes down to the core and doesn't have a gap for
epoxy to flow into, so... no lip to sand off. (Or not much.) To taper the
edges, take a sharp hobby knife and scrape the edges with the blade about
perpendicular to the mylar. A small tilt in the direction you are scraping
helps. I'm also using the mylar from ACP.
Good Luck,
James Fritz
Fort Collins, CO
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