On Mon, 24 Jan 2005 [EMAIL PROTECTED] wrote:
Somewhere out there on one of the groups, there was a discussion of sanding mylars at the LE for vacuum bagging to help it conform better to the LE radius.
Original post from SALglider list by Mark Drela:
From [EMAIL PROTECTED] Fri Jul 23 12:51:06 2004
Date: Fri, 23 Jul 2004 18:50:05 -0000 From: markdrela <[EMAIL PROTECTED]> To: [EMAIL PROTECTED] Subject: Re: Chamfered Mylar leading edge - helps wrap around
--- In [EMAIL PROTECTED], "Cliff" <[EMAIL PROTECTED]> wrote:
Did I read a post that someone is beveling the leading edge of the 14 mil mylar used for bagging? If that person will please step forward and say how they are bevelling the leading edge on the mylar, I and most of the folks here would probably like to hear about, and whether it helps with the little leading edge issues.
Yes, it lets the Mylar follow the curvature closer to the LE.
One way to make the bevel is by scraping with a blade, with the mylar sitting on a hard metal or glass edge. A box cutter is easier on the fingers than a single-edge blade. Works OK for small tail mylars. For large mylars I use a Dremel carbide bit, set up over a steel plate like a minature angled planer. The shavings make a mess, since they tend to static-cling to everything, so prepare work area accordingly.
My bevels are 1/4" to 3/8" wide, tapering to maybe 0.005" thickness at the edge. This is hard to judge while scraping, so some sort of edge thickness stop made from shim stock may simplify the job. Haven't tried that yet.
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The thread continues with more hints and opinions.
I scaped my own mylars with blade and it was easy to do.
I think that the SuperGee thread in RCGroups Hand Launch forum also had some pictures about this method.
Also a technique for notching the mylars around the tip contour for better fit there as well.
I would like to get reference to this one too.
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