Fw: [RCSE] Bagging Help

[Mike Reed]

- Original Message -
From: Mike Reed [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Sunday, December 19, 1999 6:05 AM
Subject: Re: [RCSE] Bagging Help


 Garth, I have a few answers for you. First of all, use carnauba wax on
your
 mylars. I use Eagle One paste wax and have never had anything stick. I use
 three coats on the epoxy side of the mylars and one on the outside, this
way
 everything comes apart easily.. I don't know what PJ's epoxy is but it is
 posible that it is dissolving the Freecote. If you want to remove these
 speckles from your mylars, try lacquer thinner. The epoxy is probably not
 the problem however I have never encountered any problems with West
 Systems...hope this helps you out

 --- Original Message -
 From: Garth Warner [EMAIL PROTECTED]
 To: [EMAIL PROTECTED]; [EMAIL PROTECTED]
 Sent: Saturday, December 18, 1999 9:26 PM
 Subject: [RCSE] Bagging Help


  Last week I bagged my first set of stabs for a HLG.  I had waxed the
  mylars with 7 coats of "Freecote" mold release agent in advance. Used
  "PJ's" epoxy, and left the whole thing in the bag for 48 hrs until the
  epoxy cured, (low temp in my garage).  The stab came out fine, the
  mylars came out with little tiny speckles of epoxy that failed to
  release and bonded to the surface. We're talking really tiny spots, but
  you can see and feel them on the mylars.  These little suckers won't rub
  off. I've got a feeling that this is abby normal.  So the question is...
  I want to bag some more, how do I get the little speckles off ?  How do
  I prevent them in the future ?   Different epoxy ?  Longer cure time,
  (epoxy was cured when I remove the stab from the bag), ?  Apply heating
  pad to the bag ?  Different wax ?
I have more mylar and will cut new pieces this weekend but don't think
  that I need to cut new mylars for every piece.  Any help would be
  appreciated.
 
  Thanks
  Garth
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Re: [RCSE] V tail

[Don Stackhouse @ DJ Aerotech]

Yiu Kwong Chan writes (again!!):

Using V tail to perform rudder or elevator function
have low efficiency problem. For those who knows maths
(assuming 90 degree V example) It takes two(0.7) units...(big snip of same
analysis we've heard from him before)...

Y.K., the problem here is that you're ignoring the fact that those two 0.7
units each of lift force are each being generated by a tail panel that has
greater span than the conventional fin/rudder you're comparing it to.
Induced drag is proportional to the square of that span. Yes, the total
lift force being generated is somewhat greater, but it's being generated
with much greater efficiency. The net result is that the total drag is
about the same for both tail types, with some small variations either way
depending on design details (sometimes in favor of the V-tail).


Don Stackhouse @ DJ Aerotech
[EMAIL PROTECTED]
http://www.bright.net/~djwerks/
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