[NSRCA-discussion] Wing Cores

[J N Hiller]

Before addressing the gluing we should inform other readers that the 3M-77
formula has been changed and is no longer compatible with expanded
polystyrene foam.
As for gluing I suspect the big difference is in the core surface prep.
Expanding urethane glue can be used on an as-cut core. Using a thin film of
either contact cement or epoxy may require sanding the surface of the cores
to get a high percentage of contact area. I have noticed that the material
in the center of the beads melts or shrinks away from their skin and needs
to be sanded flush. The hotter the cutting wire the more pronounced this
condition. Light sanding to a uniform soft mat finish over 80% or more of
the surface removes any melt residue leaving a flush surface gluing.
Jim Hiller

-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of wgalligan
Sent: Friday, December 28, 2007 8:53 AM
To: NSRCA Mailing List
Subject: Re: [NSRCA-discussion] Wing Cores

Jay,

You gotta try the urethane glues.  Once you do you wont go back.  Much
easier then epoxy and the stuff expands and fills in voids and the bead
areas of the foam.
Get some and try it on a test piece and try to pull the pieces apart.  Then
notice how far the foam penetrates the foam.
You will like it...   ;-)

Wayne Galligan
----- Original Message -----
From: Jay Marshall <mailto:lightfoot at sc.rr.com>
To: 'NSRCA Mailing List' <mailto:nsrca-discussion at lists.nsrca.org>
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>
[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 <mailto:lightfoot at sc.rr.com>

To: 'NSRCA Mailing List' <mailto:nsrca-discussion at lists.nsrca.org>
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 <mailto:JAStebbins at worldnet.att.net>
To: NSRCA Mailing List <mailto:nsrca-discussion at lists.nsrca.org>
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 <mailto:lightfoot at sc.rr.com>
To: nsrca-discussion at lists.nsrca.org
<mailto: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

  _____

_______________________________________________
NSRCA-discussion mailing list
NSRCA-discussion at lists.nsrca.org <mailto:NSRCA-discussion at lists.nsrca.org>
http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
  _____

_______________________________________________
NSRCA-discussion mailing list
NSRCA-discussion at lists.nsrca.org
http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
  _____

_______________________________________________
NSRCA-discussion mailing list
NSRCA-discussion at lists.nsrca.org
http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
  _____

_______________________________________________
NSRCA-discussion mailing list
NSRCA-discussion at lists.nsrca.org
http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.nsrca.org/pipermail/nsrca-discussion/attachments/20071228/b8e63c04/attachment-0001.html