On Mar 16, 2006, at 6:22 AM, k7fm wrote:
> "Amen, Arne, and plywood is stiffer pound for pound than metal. During
> WW-2, the most common beach landing craft were made of mahogany
> plywood. These craft were designed and manufactured by Andrew Higgins
> in New Orleans, Louisiana. Higgins' boats were used in both Europe and
> the Pacific theatres."
>
> The main spar in my aircraft is a box made from thin plywood. The
> leading edge of the wing forms a D spar and is made from thin birch
> plywood. I trust my life with the stuff.
Birch is what the Hughes Hercules/Spruce Goose flying ship/boat was
made of.
>
> What wood does not do is shield rf.
Why shield the power supply from the antenna's RF field?
> But, that can be solved fairly easily. Many years ago I built a regen
> receiver using wood. But, I found the hand capacity, when I got near
> the front panel, changed the frequency (bad). I solved the problem by
> covering the inside of the wood panel with household aluminum foil,
Clever. An early "composite" construction.
> which was connected to the frame of the tuning capacitor. Still have
> that gem.
>
> ...
> Colin K7FM
>
>
>
>
>
>
Rich Measures, 805.386.3734, AG6K, www.somis.org
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