Tony, all:
The welding cable idea is a good one, but is 16mm
2 welding cable truly
equal to
4AWG aircraft cable, or even #4 welding cable? I'd appreciate someone
finding
the error in my logic.
item diameter cross-sectional area
ohms/1k ft.
4AWG cable 0.204" 0.03278 in
2
0.253
#4 welding cable, 420x#30 0.01* 0.03298 in
2 0.249
16mm
2 welding cable ? 0.0248 in
2
0.33
I assumed that 16mm
2 welding cable has an area that's really 16mm
2, not
something weird like the "circular mils" dimension that AWG uses, and I
estimated its resistance from the area ratio. Looking up a standard AWG
wire table, 16mm
2 cable looks like something slightly smaller than 5AWG.
Of course, I may be splitting hairs...
Shaun
----- Original Message -----
From: "Tony Krzyzewski" <tonyk@kaon.co.nz>
Subject: connectorisation.
> It solders up nicely and the insulation
> > doesn't run back when you heat up the copper core.
>
> You can solder the 4AWG wire if you follow the instructions on Bob
Nuckolls
> site (which is now up again... www.aeroelectric.com but you should be
crimping
> all of the smaller gauge wires with a decent crimping system like AMP
PIDG.
>
> Incidentally, if you subsitute 16mm welding wire for the 4AWG wire you'll
find
> it a much easier beast to work with. Telflon coated MIL aircraft wire is a
pig
> to bend whereas the welding wire is much more flexible. The welding wire
also
> happens to fit 16mm cables ends (strange that!) which may be easier to
locate
> in metricised countries than the 4AWG connectors. Another factor is that
4AWG
> aviation wire costs serious dollars whereas enough 16mm welding wire to do
two
> aircraft cost me USD5 from a local welding shop. The 16mm welding wire is
> flexible enough to use for the engine ground return wire and is a lot
easier to
> terminate than the braid that most people use.
>
> > > I plan to use screened cable for most of the connections to the rear,
> > with the earth in the screen.
>
> No go on that one. Seperate earth wires will be required for isolation
purposes.
>
> > > battery, regulator and earth
> > > magneto cables
> > > firewall forward connections (sensors, CS prop, tacho)
> > > rear compartment connections
> > > audio panel connections
> > > antenna connections
>
> Don't put intermediate connectors in the antenna wires and only bring
things
> through connectors that actually have to have connectors. If things can be
> linked together on the firewall without a connector then make the
connections
> there.
>
> >> ANR power supply.
>
> I am powering my ANR off the aircraft electical supply. I used a 12v
regulator
> followed by a 12v/12v DC isolator followed by a 9v regulator. This gives
me a
> very clean and isolated power source for the ANR circuitry.
>
> Tony
>
>
|