[Amps] CHASSIS

[R at contesting.com]

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
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Rich Measures, 805.386.3734, AG6K, www.somis.org