Art,
Apply a smidge of thinned adhesive to the TOP of the film, nudge
formation of a small crease just outside the dihedral rib, and let
capillary action do most of the rest. The crease should mostly form itself.
The first SEVERAL times that I read the instructions, I did not
understand the adhesive was best applied to the top of the film. I
wanted to get the instructions clarified, but was largely unsuccessful.
Fred Rash
On 8/28/2013 12:01 AM, art wrote:
>
> This is, and was intended to be, a learning exercise.
>
> I don't know if I'm repeating myself, but I started with an old LPP
> wing, ready for the scrap heap (where it is now). It was covered in a
> very unskilled manner with Ultrafilm. There was loads of slack on both
> sides of the dihedral break rib. I read thru the advice, including
> some that came in offline. First thing I made a soft balsa tweezer
> about 1/4" wide. Then I ran glue onto both sides of the rib and
> clamped down with the tweezer along the rib from the top. This drew in
> 1/16" of film on each side of the rib, which made a big difference in
> contour but there was still some sag left. In addition, the rib now
> projected above the top surface of the wing (although the airfoil was
> correct, only 1/16" south of where it should be). I let that dry, then
> glued both sides of the rib from the top and came in with the tweezer
> from the bottom, drew in another 1/16" of film on each side of the
> rib, and pushed it back up to the top. Now I had eliminated 1/4" of
> excess film and it almost looked perfessional.
>
> For the new wing, I made a copy of a fixture devised by John Barker
> (the Atlanta one), deployed the OS film on it, and stuck the bones
> onto the film. Once dry and cut loose, I added 30º of dihedral and
> there was no really objectionable sag. However, in the interest of
> learning how to do it right, where there's only a maximum of 1/16" to
> be pulled out, and only on one side of the rib, what would you do with
> it? Glue the top and work the film into the glue with the tweezer from
> the bottom? Or let it go?
>
> The new wing is really clean looking and has rendered the model 300mg
> underweight. That's a first for me.
>
> a.
>
>
>
Received on Wed Aug 28 2013 - 05:54:28 CEST
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