[NSRCA-discussion] Wing Cores

[Karl G. Mueller]

I had used the contact cement method back in the 70's with the 3M-77glue.
It worked great. But after a few years sitting out in the sun the contact
cement
would dry out and the sheeting would delaminate. This was on a painted wing.
The sheeting would come up in bubbles and the only way to fix this was to
iron
it down with an iron set to just below the melting point of the paint. This
would
reactivate the glue again and the sheeting would stick down to the foam
core.
After that I changed to epoxy and never had any problems like that again.
If you only have your plane for about 2-3 years it is not a problem, but I
usually
keep my planes for 6-8 years and that's when it will show the problem of
delaminating.

Karl G. Mueller
kgamueller at rogers.com

  ----- Original Message ----- 
  From: Jay Marshall
  To: 'NSRCA Mailing List'
  Sent: Friday, December 28, 2007 7:54 AM
  Subject: Re: [NSRCA-discussion] Wing Cores


  I tried the contact method with the JWR Blue adhesive last night; I coated
both balsa and foam surfaces, waited 15 minutes, and pressed them together.
Worked fine. Now I have to make a choice between this or epoxy for sheeting.



  Jay Marshall

  -----Original Message-----
  From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of J N Hiller
  Sent: Friday, December 28, 2007 5:36 AM
  To: NSRCA Mailing List
  Subject: Re: [NSRCA-discussion] Wing Cores



  I used 3M-77 for years because it was quick & easy. Contact cement is very
unforgiving and twisted / warped wing panels needed to be dealt with
occasionally. I am somewhat more patient now and use finishing resin epoxy.

  Jim Hiller



  -----Original Message-----
  From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of Nat Penton
  Sent: Thursday, December 27, 2007 12:37 PM
  To: NSRCA Mailing List
  Subject: Re: [NSRCA-discussion] Wing Cores



  Jay

  I will be interested to see how you come out if you have the foam supplier
cut your cores. High taper ratios ( two or more ) call for smaller cutting
wire. Who and where is the supplier located - I need some foam ?



  Is the the JWR Blue adhesive similar  to 3M 77 contact adhesive ? If so
you want need the vac bag. Most builders use epoxy or polyurethane glue for
wing skinning.            Nat

  ----- Original Message ----- 

  From: Jay Marshall



  To: 'NSRCA Mailing List'

  Sent: Wednesday, December 26, 2007 11:11 AM

  Subject: Re: [NSRCA-discussion] Wing Cores



  Thanks Jimmy. I found a local source that provides foam board, blocks &
shapes for many applications, including packaging and constructions forms.
They cut four blocks of 1# to 4X36X18 and then gave me a can of glue to
try – all at no cost. Great people to work with! They can even cut the wings
if I provide the masonite templates!



  Jay Marshall

  -----Original Message-----
  From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of jimmy graver
  Sent: Wednesday, December 26, 2007 12:03 PM
  To: NSRCA Mailing List
  Subject: Re: [NSRCA-discussion] Wing Cores



  Jay, I am looking to cut foam wings also this a source I found for foam.
http://www.aircraftspruce.com/catalog/cmpages/styrofoam.php

  I buy my spruce from them and there service is good. Hope this helps.

  Jimmy Graver

  ----- Original Message ----- 

  From: Jerry Stebbins

  To: NSRCA Mailing List

  Sent: Tuesday, December 25, 2007 5:23 PM

  Subject: Re: [NSRCA-discussion] Wing Cores



  Jay, depends on where you are. There are places in/around Atlanta--check
with Mike Hester-he buys all the time.ACH foam Technologies.  I just bought
7 sheets in Nashville. Mix of 0.5 and 0.9 oz foam (virgin). Company was EFT
Corporation. Might try them.1 615-832-6222.

  Jerry

  ----- Original Message ----- 

  From: Jay Marshall

  To: nsrca-discussion at lists.nsrca.org

  Sent: Tuesday, December 25, 2007 3:48 PM

  Subject: [NSRCA-discussion] Wing Cores



  What is a good material and source for wing cores? I have someone to help
cut them.



  Jay Marshall




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