[NSRCA-discussion] Wing Construction

Thu Nov 8 06:34:52 AKST 2007

Once you have a diamond shaped template (2) it is actually very quick to cut
out the foam with a hot wire.  The templates may take a bit of time to make
however.   With a "honeycombed wing" using a syringe to apply the glue in
the center of your foam structure is the way to go.  I think I used a 12
gauge agiocath (plastic part of an IV setup).  You can get away with less
epoxy and it will certainly adhere as it is in beads much thicker than the
squeegeed on version.  I will agree though that you risk soft spots in the
structure that may show up or easily be pushed in by heavy hands as there is
no foam beneath.  I have done most of my wings the standard way with a thin
layer of epoxy over the entire foam surface and have never had that
delaminate either so I think it is good enough strength wise.  Personally I
do not think I would honeycomb wings again.  I still have a 60 sized Desire
with them (built in '91) so they do hold up but I do not think it is worth
the weight savings.  Coring the center may be the better way to fo to remove
foam weight.

Stuart

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From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Jay Marshall
Sent: Thursday, November 08, 2007 10:07 AM
To: 'NSRCA Mailing List'
Subject: Re: [NSRCA-discussion] Wing Construction

Seems like the fastest way would be with a drill press and cutting out
circles rather than diamonds or square?

Jay Marshall 

-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Dave Smith
Sent: Thursday, November 08, 2007 9:57 AM
To: NSRCA Mailing List
Subject: Re: [NSRCA-discussion] Wing Construction

Karl,et al:   Ukie fliers have been coring wings this way for years.

Dave

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

From: Karl G. <mailto:kgamueller at rogers.com>  Mueller 

To: NSRCA Mailing List <mailto:nsrca-discussion at lists.nsrca.org>  

Sent: Thursday, November 08, 2007 10:46 AM

Subject: Re: [NSRCA-discussion] Wing Construction

Mark,

I have found that it is very hard to get more than 1 oz. out of each 

panel on a 2m  pattern wing.

I have seen this method done in Europe a number of years ago.

It is a lot faster, once you have the right setup, than cutting out all 

the little squares or diamond shapes. 

Karl.

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

From: flyintexan <mailto:flyintexan at comcast.net>  

To: NSRCA Mailing List <mailto:nsrca-discussion at lists.nsrca.org>  

Sent: Wednesday, November 07, 2007 10:30 PM

Subject: Re: [NSRCA-discussion] Wing Construction

I second that motion!  This is a great way to take about an ounce of foam
out of each core.

-mark

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

From: Lance Van <mailto:patterndude at tx.rr.com>  Nostrand 

To: NSRCA Mailing List <mailto:nsrca-discussion at lists.nsrca.org>  

Sent: Wednesday, November 07, 2007 9:21 PM

Subject: Re: [NSRCA-discussion] Wing Construction

Karl,

My answer might surprise you.  When I have need to core my foam cores I core
them from root to tip so the foam surface is in full contact with the skins.
My wings were of interest to several people at the Nats to see how this
works, but the local guys are used to my weirdness.  This approach produces
a wing with no soft spots on the surface.

--Lance

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

From: Karl G. <mailto:kgamueller at rogers.com>  Mueller 

To: NSRCA Mailing List <mailto:nsrca-discussion at lists.nsrca.org>  

Sent: Wednesday, November 07, 2007 7:53 AM

Subject: Re: [NSRCA-discussion] Wing Construction

Lance,

Do you apply the glue to the skins or to the foam core in case of a

cored (with cut-outs for weight saving) foam core. I thought that the

amount of glue spread on the skins in the areas that do not make 

contact with the foam would be unnecessary weight. It will strengthen

the skin some.

Karl G. Mueller
kgamueller at rogers.com

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

From: Lance Van <mailto:patterndude at tx.rr.com>  Nostrand 

To: NSRCA Mailing List <mailto:nsrca-discussion at lists.nsrca.org>  

Sent: Tuesday, November 06, 2007 11:13 PM

Subject: Re: [NSRCA-discussion] Wing Construction

Foam roller, my friend.  a squeegee will force resin into the pores and away
from the joint.  Only a roller applied fast and light can meter the material
properly and keep in on the surface.

--Lance

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

From: Nat <mailto:natpenton at centurytel.net>  Penton 

To: NSRCA Mailing List <mailto:nsrca-discussion at lists.nsrca.org>  

Sent: Tuesday, November 06, 2007 9:32 PM

Subject: [NSRCA-discussion] Wing Construction

To skin a foam core with contest grade balsa does anyone have a preferred
way to determine when the amount of epoxy applied is adequate - using Easy
Lam epoxy. I have been reluctant to use a squeegie, afraid of scoring the
balsa. Would appreciate any comments.                            Nat

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