oops. . . I meant Plumber's Putty.
Dave. . .there is no need to slit the Mylars to get a smooth tip. Go to page 24 of File 3 of the Genie pages http://genie.rchomepage.com/ to see how the Icing putty can be used to form a tip that looks integral to the rest of the bagged wing.
----- Original Message ----- From: <[EMAIL PROTECTED]>
To: <Soaring@airage.com>
Cc: <[EMAIL PROTECTED]>
Sent: Tuesday, January 25, 2005 7:39 AM
Subject: [RCSE] Mylar LE - Thanks
***** From: Arne Ansper <[EMAIL PROTECTED]> Original post from SALglider list by Mark Drela:
From [EMAIL PROTECTED] Fri Jul 23 12:51:06 2004To: [EMAIL PROTECTED] Subject: Re: Chamfered Mylar leading edge - helps wrap *****
Thanks very much for the update. This works - last night's bagging came out
very well.
I'm just trying to minimize my 'cleanup' of a LE when it comes out of the
bag. This helped - along with fitting the mylars pretty snug as Phil
recommends. Still working on the tip radius.
For the tip radius, simply notching the mylar as a starting point didn't
work. The idea was to relieve the compression a bit so the mylar could conform
better to the compound curve (tip radius + LE radius). The mylars follow the
tip radius very well and wrap around the LE but the notches don't allow any
room for the mylar to decompress. Razor notches don't remove any material so
this certainly makes sense (duh - in hindsight). You wind up with 3 or 4 bulges
around the tip radius. Resin will 'puddle' a bit in these areas making it
more difficult to finish the tip. Cutting the mylars back around the tip would
have been better. But....
I've cut notches ~ 1/4" deep at the sites of the 4 bulges and will do the
other tip tonight. Since I eventually use reflective tape my LEs, this isn't
about getting the prettiest LE, just one that needs very little work after it's
cured. We'll see.
One problem with thinning the LE of the mylar, it can crack when removed.
Although I had an excellent release, the little bit of resin that seeps around
the edge trapped a small section of the tip mylar (right near one of those
bulges). A small rip (~ 3/8") developed while removing the mylar in this area.
I was trying to remove from LE to TE. If it had gone from TE to LE, it
wouldn't have ripped.
Thanks for the several replies on this topic.
- Dave R
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