Double covering fabric covered wings

wrote:

On Thu, 06 May 2004 15:04:54 GMT, Richard Lamb
wrote:

The Poly Fiber manual specifically recommends NOT to do this because
Poly Tack, when dry, it too hard to stand up to the flexing of the
fabric.

That would mean using Poly Brush to attach the second layer - and how
now do we shrink the second layer???


Richard Lamb

I dunno. The second layer of fabric might be applied with polybrush
and not polytac. I'm not familiar enough with the process to state
accurately. I'll find out.

As to shrinking the second layer, that's done with the iron calibrated
for 250 degrees. I've seen the results and even without any anything
applied to the fabric to seal it yet, it looks very nice.

Corky Scott

250 degrees is only the _starting_ point.

Last pass is at 350 degrees!

If the first layer has been coated with Poly Brush, the heat from the
iron will quickly soften the coating. PB starts melting at 200 degrees.

By the time the iron is up to full temp, it would be hard not to melt
into the previous PB layer - possibly causing fabric pulls and gouges.

Maybe the outter thin fabric doesn't have to be tightened that much?

As long as the first layer is strong enough, the second might only need
to be snug enough to pull out the wrinkles. Call it non-structural?
Second pass at 250 on light fabric _might_ do it?

Bottom line, Corky, I don't really know much, I've never tried it.
It seems like there may be some potential pitfalls in the doing part,
but it sure did look pretty on that Pacer.


Richard Lamb