Construction of one piece wings

[Nedim Bek]

Peter,
 
I am building single piece foam wings for more than 20 years. I am
fabricating a single piece wing 2m pattern kit as well.
I recommend using 3/4 lbs/cu.ft. virgin foam for cutting the cores and
selected contest quality 1/16 balsa for the skins. I am using laminating
epoxy to glue the skin. Polyurethane adhesive is equally good but needs
more time to wait before removing from the press, otherwise the panels
may get warped. Use a playing card to spread the glue.
With the above materials and technique the end product will be just
under 2 lbs. includingh glassing, two 9150 servos, linkages and
Ultracote covering. If you are targeting less than that you may apply
honeycombing to the cores. This may save you a couple of ounces at
least.
I glass the center section with two layers of 2 oz. fiberglass cloth,
first layer 4 inches wide and second 10 inches. Remove all the excess
epoxy with a playing card. After the lay up is cured sand smooth and
apply NHP balsa coloured micro fill thinned with water to fill the
texture of the fiberglass cloth.
Hope this helps.
 
Nedim  
 
NBE Precision Aerobatics
Products & Services
http://nbengineering.net/

-----Original Message-----
From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]
On Behalf Of PENNISI Peter
Sent: May 4, 2004 4:05 PM
To: discussion at nsrca.org
Subject: Construction of one piece wings


Hi all,
 
 
I am going the build a new wing for my ZN-Line Alliance because the
original is too heavy. I want to build the lightest wing possible. What
is the best way to go about this. I will be using fixed gear this time
so retracts are not a factor. 
 
Is removing foam from the wing advisable (lightening holes in foam prior
to sheeting)?
should I use any spars? (remember one piece wing) if so what should they
be made off and how large.
What glue is recommended? (epoxy - probond etc)
 
The wing will need to hold up to the current F3A schedules.
 
Any tips would be appreciated.
 
 
Regards,
 
Peter
 

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