Foam Honey-Coming Weight savings

[AtwoodDon at aol.com]

The amount of weight saved by honeycombing a wing is more than the foam  
weight.  It is a combination of the foam weight and the epoxy or adhesive  you 
don't use in those areas.  Once the foam is honeycombed, take the  template and 
very lightly mark the outline of the honeycomb on the inside of  each wing 
skin.  Then only apply adhesive to the areas of the balsa skin  that will contact 
the foam.  The combination of the foam weight reduction  as well as the 
reduced adhesive will give you the greatest reduction.   Admittedly, the reduction 
is not large but when you consider reducing an ounce  in a 11 or 12 oz wing 
panel, the percentage is respectable.
 
Don Atwood
 
you have the wing honeycombed, In a message dated 7/27/2005 7:22:37 P.M.  
Pacific Daylight Time, kerlock at comcast.net writes:

Yup a little.
 
Whether it's worth it or not totally depends on  the amount of weight you're 
looking for. Actually cutting the honeycomb isn't  too difficult or time 
consuming, but making the templates can be a little  painstaking. However once you 
have them, you have them for a few  planes.
 
I am currently running a fairly thick tip  section, and performed 
honeycombing on the outer half of the wing panel past  the spars. It saved about an ounce 
per panel compared to the first set I made.  So, you save a couple of ounces, 
and remove some mass from your wingtips. Does  it help? I'm sure it doesn't 
hurt, and theoretically (being the operative  word) it can help in dampening 
snaps and spins...but not a lot, unless your  tips are really heavy to begin 
with. 
 
If you're building an electric or a plane that  historically comes out close 
to the limit, it could be worth the effort. I'm  not sure it's worth it on a 
10 lb or less plane.
 
Just my 2 cents.
-Mike

----- Original Message ----- 
From:  _Jim_Woodward at beaerospace.com_ (mailto:Jim_Woodward at beaerospace.com)   
To: _discussion at nsrca.org_ (mailto:discussion at nsrca.org)  
Sent: Wednesday, July 27, 2005 4:46  PM
Subject: Foam Honey-Coming Weight  savings



Hi Guys,  

Does anyone happen to have some  experience in weight reductions from foam 
honey-combing?  Wing cores,  stab cores, vertical fin and rudder cores?  Maybe a 
25% weight  reduction? 

Thanks,  
Jim W. 



 
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