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Date: Thu, 18 Oct 2007 22:19:02 -0400
From: Finn Lassen <finn.lassen@verizon.net>
Subject: Re: [FlyRotary] [Fwd: What's Inside Aircraft Jumper Cables?]
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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Possibly to prevent wrong polarity when hooking them up. But I don't 
quite see how it would help.
50 ohms across 12 volts is only 1/4 amp, so that would hardly blow any 
fuse. Maybe the 50 ohm resistor would get hot enough (3 watts) that it 
would alert the user?

Or to prevent negative spikes during connection/disconnection from the 
power source from damaging alternator/generator or avionics in the airplane?

Finn

Dave S wrote:
> Seen in Rec.aviation.piloting.
>
> Anyone know?
>
> -------- Original Message --------
> Subject: What's Inside Aircraft Jumper Cables?
> Date: Thu, 18 Oct 2007 09:24:42 -0400
> From: Paul Dow (Remove Caps in mail address) <pNaOuSlPdAoMw@cox.net>
> Organization: Cox
> Newsgroups: rec.aviation.piloting
>
> A friend of mine has some very nice aircraft auxiliary power cables, and
> he was going to take it apart and remove the insulation for the scrap
> copper. After seeing how nice it is (4/0 stranded cable), he put it back
> together, but he noticed something strange. Inside the plug connector
> was a 50 ohm resister in series with a diode connected across the two
> cables. Copper pins were inserted into the braided wire to make the
> connection.
>
> Does anyone know what that is for?
>
> Thanks
>
> -- 
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