Surface Flatness, now Faraday cages

[Bill Glaze]

Bob:
Remember the problems with the B-2B and the "Iron Ball paint?  Bill Glaze

Bob Richards wrote:

> I mentioned that the material used to construct RF shielded rooms 
> would make a good flat worksurface. Then somebody mentioned "Faraday 
> cage" -- completely off topic for the group. Funny, though, it made it 
> back to "don't build a fuselage out of this stuff".
>  
> You mentioned full-sized aircraft fuselages being Faraday cages, they 
> are to some extent. Not only can the fuse shell keep signals out, they 
> can also keep signals in. Very high field strengths can be achieved 
> with very little power, and nodes can exist where reflections arrive 
> in phase. This is a very big problem, and compliance test standards 
> (such as DO-160) exist to insure that systems inside an aircraft don't 
> emit strong signals that can interfere with other systesms, and can 
> also still operate when interference is present. This is also why they 
> don't want computers and electronic equipment operating during the 
> times that the instrumentation is most needed (takeoff and landing, 
> especially in IFR conditions).
>  
> Bob Richards.
>
>
> Rcmaster199 at aol.com wrote:
>
>     The tangents that some threads create are often much more
>     interesting than the original intent of the thread.
>      
>     Keith I would say it's not a good idea. If you built a fuse out of
>     this material, (done everyday BTW),  I suggest you build it large
>     enough to accomodate the person flying it (vbg). I know Bill, Don
>     Ramsey and Al Glenn and probably several more, flew or still fly
>     "Faraday Cages" for a living
>      
>     Now, how we went from measuring surface flatness to "shielding"
>     devices from EMI/RFI (regardless of what the emitting source is),
>     is beyond me
>      
>     MattK
>      
>
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