Cut, join and sand the sheeting to a good smooth surface before you attach it to the wing. Sanding the surface too heavily when its on the wing causes the ribs to show through!

Cheers

Not that this matters here. But, I built a 696sq." stunt ship almost entirely from 3/32 including fuse sides and molded balsa top & bottom blocks, it weighed 59 oz ready to fly and with modern power and building practices it is plenty strong.

On one of Bobby's videos he shows how he does the joining of sheets of wood.  Trim one side of two sheets of wood.  Put the trimmed edges together.  Put a strip of good ole masking tape down what will be the seam.  Carefully turn the two sheets over to see if there are any gaps.  Now fold them up a little to open the seam.  Put a thin stream of white glue down the seam.  Lay the sheets down flat and wipe off the excess glue.  The tape should be down.    I think in Bobby's video he show wrapping masking tape around a couple of fingers.  Lay the sheets down flat with no gaps.  Take your bottle of CA and start putting a drop or two down the seam.  Rub it in with the taped up fingers.  When done turn it over and remove the tape.  Now trim up one of the edges that was just glued and trim another sheet to add to it.  Same tape and CA as before.  Once you have the sheets glued up to the width you want, block sand both sides.  I think that is why you start with 3/32 inch sheet wood.  Mark which side will be the outside surface.   Now what was the question???

did I miss it. but are asking for a built up or foam wing. built up use 3/32 foam wing 1/16

at the risk of telling people how to ' suck eggs ',

 1/16 = 1.6 mm

 .077 = 2.0 mm

 3/32 = 2.4 mm

 one could have a sheet of ea. with identical weight. were would that leave you ?

Good 'ole balsa cement has been around for decades. It consists of cellulose resins in a solvent base, thick dope with some other ingredients I think
So it sands easy, its gone out of fashion since cyano's came along. It takes a long time to dry properly, but model shops still stock it, well they do here in England anyway It's good for some jobs though. Its all we had years ago.

Cheers

Hi all:

Actually Doc didn't get it quite right as I don't use, and never did use white glue or Aliphatic resin for joining skins. I did long ago use the "tent peak" method of joining the skins with a masking tape "hinge" and then folding open the gap. I used Ambroid as the adhesive then, not white glue.

I've long since developed new, and I think better, way of sheeting foam core wings. I once put this entire dissertation onto Stunt Hangar, and it should be in the archives somewhere.

I stumbled across a website that has apparently "pirated" that how to. Although that has me a bit miffed, the main thing is to get the information out to those who need it. So, here is the URL to find that complete How-To on not only sheeting foam core wings, but also on how to attach molded leading edge caps to cores that have fully rounded leading edges. So, go here:

 http://www.scribd.com/doc/24384216/Bob-Hunt-Sheeting-Wing

Later - Bob

My bad Bob,  this after watching your videos several times.  But, read on down on my post.  Every body should have your building videos.   

I have the video.  Spencer watched it with me attentively the first two times, but got bored and walked off the third time.  I have a bunch of nice, molded parts now.  Joining sheets takes a little technique.  I was initially squeezing them together a little too hard.  I also gouged the light balsa with ridges on the tape on my fingers.  I'd better give the video another run-through.