nuckolls.bob(at)aeroelect
Guest
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 Posted: Thu Dec 25, 2008 1:27 pm Post subject: Is this scheme valid to save weight, add flexibility |
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At 07:56 AM 12/25/2008, you wrote:
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Merry Christmas and happy holidays to all.
Have a mini break.
I have an aft battery on my Europa XS with Rotax 914. Wires run parallel
with radio antennas for ~ 5 or so feet. I have main battery switch in
passenger headrest.
Initial plan was to use #4 Tefzel wire with short pieces of #6 welding
cable at battery attachment (for flexability) and at battery switch
attachment (to more easily negotiate routing). I was going to turn butt
connectors out of 101 copper with precise holes for #4 and #6 wires with a
cross drilled hole slight outboard of each wire to allow me to add solder.
Just a note that #6 welding cable has a slight larger OD compared to #4
Tefzel. I don't have space for the diameter of #4 copper plated aluminium
wire.
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That would work but is pretty labor intensive. Lapped,
soldered and heat-shrink would work too and is quick.
| Quote: | I was happy with above plan >>>>>>>>> until got to thinking >>>>>>>>>>
Might be better off using two paralleled #8 Tefzel wires instead of one
#4????
Could twist 2 sets of #8 together (each twist pos + neg) which could help
out with potential noise on my paralleled run with RG400 antennas.
#8 would be flexable enough to negate need for welding cable.
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"better off", "flexible enough", "potential noise"
are all non-quantified . . . and don't offer a lucid
image of your design goals.
| Quote: | Two paralleled wires in one respect add redundancy of connection.
Two paralleled #8 wires are lighter than one #4.
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But smaller in cross-section than one #4.
| Quote: | Cons:
Need more terminations, but even with more terminations still lighter than
#4 / #6 combo.
Twisting pos + neg perhaps could somehow create more of a hazard of them
shorting together compared to pos and neg #4 sitting side by side.
There is a slight amount more resistance of two #8s compared to one #4. I
don't think this will be too much of a problem with lower compression and
slight less displacement of Rotax 914 compared to Rotax 912S. I also have
heavy duty starter that in fact draws less amps compared to old style
starter??
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Exactly how much weight are you "saving" and how much
$time$ are you investing in the goal. You've added
joints to the system that wouldn't have to be there
with a contiguous run of 4awg welding cable.
Have you calculated the delta-weight for the proposed
architectures?
| Quote: | OK
Is this scheme valid to save weight, add flexibility and reduce noise from
fat wires?
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Don't worry about noise from these wires into antenna
systems or feedlines. Twising is not necessary either.
Just run them tightly parallel with string ties every
6" or so.
| Quote: | Anyone know of a source to obtain #8 wire with silver plating (would help
out slightly with lower resistance)?
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Silver plated wire comes on Teflon insulated conductors.
More expensive, less robust and so small an improvement
as to not be noticed.
I'd still like to see how much weight you expect to save
with any alternatives to single strands of 4AWG. How long
are these runs of wire?
Bob . . .
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