Transferring from drawing to wood

[Tomanek, Wojtek]

Xavier
 
I usually, cut the bulkhead/formers out of a piece of cardboard to make sure
the fit is correct or at least close to the final, then I make one out of
1/8, 3/16, or ¼ inch sheet balsa and recheck the fit.  Balsa is soft enough
to shape easily but rigid enough to make sure you can actually install it.
Then I cut the final former either light ply or fiberglass encased ¼ balsa.
Final results can be good, last firewall I installed had not more than
1/16-inch gap at any point.  When you are happy with the fit you can
actually shape the edge to an inverted shallow V (just like control surface)
to allow for easy application of epoxy.  Ribs are tougher especially on
tapered wing.   Here make root and tip shapes using Formica(tm) or similar a
drill at least two alignment holes in the two.  Then rough cut ribs with
some spacers (if you use 1/8 for ribs, you may have to use ¼ balsa spacer
(thickness of the spacer depends on the taper of the wing if no taper they
are not needed).  Bolt everything together and sand to shape with a T bar,
or similar. You can also cut out notches for the spars trailing and leading
edge in the Formica. 
 
Hope this helps
 
Wojtek
 
 
-----Original Message-----
From: Anne & Xavier [mailto:xavier.mouraux at sympatico.ca]
Sent: Monday, February 10, 2003 11:19 PM
To: discussion at nsrca.org
Subject: Transferring from drawing to wood
 
It's me again,
 
My next project for this winter  will be scratch build and involve
transferring parts (bulkhead and ribs in particular) from the drawing to
balsa and ply.
What is the preferred method to do so ? I tried ironing a photocopy on the
wood and also gluing the copy on the wood using contact cement but the
results were not great. What are the other options (apart from getting a
laser cut pack) or the proper procedure for the 2 above ?
 
Thanks a lot
 
Xavier
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