I think the website is down temporarily- I just visited it a few days ago.
Bob's sister company,
http://www.bandcspecialty.com, is up, and the links to aeroelectric.com are
still there.
Shaun
----- Original Message -----
From: "Tom & Cathy Friedland" <tfriedland@attbi.com>
Subject: Re: Bundling of coax cables
> Tony
>
> You have recommended Bob's www.aeroelectric.com recently. I am not able
to
> get into his web site any longer. Do you know if he is still in business?
> I have his book and it probably has a phone number in it. I can try
> phoning.
>
> Tom Friedland
>
> "Tony S. Krzyzewski" wrote:
>
> > So a "negative" bus bar, with about a dozen connections, should be
> > thrown and replaced with a single point connection for all the "circuit"
> > return wires ,as well as a single point connection for the "grounding "
> > wires? (Just convince me please that circuit negative wires are the same
> > or different to "ground" wires?) Regards Bob
> >
> > A negative bus bar is a single point ground if all of your
> > ground/negative wires terminate on the bar. If all your wiring
> > terminates on this single bus bar then you have the best form of ground
> > return other than terminating all of the wires at the battery.
> >
> > The key is to have all the circuit return wires terminate at as few
> > (preferably one) point on the aircraft and to have minimal resistance
> > (read big fat wire)to the current source return (battery). This single
> > point can be a bus bar, a bolt or a plate with connectors. The point
> > here is that the resistance between the individual return line
> > termination points should be very, very low and a block of brass bus bar
> > does this very nicely.
> >
> > Circuit negative wires are the same as ground wires which are the same
> > as return wires.
> >
> > On a tin can aircraft the skin and structure effectively can act as a
> > very large single point ground with the return current flowing over the
> > entire skin. As it's a massive area electrically the current flow per sq
> > cm is miniscule. Composite aircraft don't have the luxury of having this
> > cheap return path so we have to build an individual return path for each
> > and every circuit. Unfortunately electricity has the habit of finding
> > the easiest path to ground and, if the returns form multiple paths to
> > grounds and there is a variation in resistance of those return lines,
> > then voltage differences can be induced between the ground points as the
> > current flows between them. Bringing all return lines to a single point
> > and ensuring that the single point has a low resistance to the aircraft
> > true ground point removes the problem.
> >
> > I have built several large computer controlled model railway systems
> > over the years which have amazing parallels to wiring the aircraft.
> > Failure to bring the grounds back to a single point in those systems can
> > induce so much electrical noise that the microelectronics simply fails
> > to work.
> >
> > Tony
>
>
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