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rparigor(at)SUFFOLK.LIB.N
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 Posted: Thu Dec 25, 2008 6:04 am Post subject: Is this scheme valid to save weight, add flexibility a |
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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.
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.
Two paralleled wires in one respect add redundancy of connection.
Two paralleled #8 wires are lighter than one #4.
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??
OK
Is this scheme valid to save weight, add flexibility and reduce noise from
fat wires?
Anyone know of a source to obtain #8 wire with silver plating (would help
out slightly with lower resistance)?
Ron P.
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psamuelian(at)charter.net
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| Posted: Thu Dec 25, 2008 9:16 pm Post subject: Is this scheme valid to save weight, add flexibility a |
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Ron:
If you need the capacity of #4 wire for the starter, 2 #8 wires have
much less capacity than 1 #4.
Two #7 wires are very close to the same capacity, but I'm not sure of
#7AWG availability.
I would recommend staying with the first plan, using #4 cable. Radio
interference would be from the alternator charging, but it's at a
much lower ampere rating and would produce much less EMI than when
starting the engine.
Also, invest in the highest quality cable for the antenna.
If interference even exists after that, then use filters to clean
that up.
Phil
On Dec 25, 2008, at 5:56 AM, rparigor(at)SUFFOLK.LIB.NY.US wrote:
| Quote: |
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.
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.
Two paralleled wires in one respect add redundancy of connection.
Two paralleled #8 wires are lighter than one #4.
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??
OK
Is this scheme valid to save weight, add flexibility and reduce
noise from
fat wires?
Anyone know of a source to obtain #8 wire with silver plating
(would help
out slightly with lower resistance)?
Ron P.
|
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http://www.matronics.com/Navigator?AeroElectric-List |
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