REFLECTOR:Firewall penetrations (was Control Cables)

[Laurence Coen]

Ronnie,

I think there are a couple of problems with your approach of connecting the
alternator to the starter hot terminal.  First, you should use a fusible
link to make the connection.  This is to prevent a fire should the
alternator fail in short circuit mode.  I have never met an aircraft that
didn't have a circuit breaker in the alternator battery connection.  If you
want an ammeter it would have to be wired into the battery lead which means
that starter motor load would go through the ammeter. A 60 amp device would
be fried on the first startup. My advice would be to do it the way that Jim
Agnew suggests.

Larry Coen
Std. RG/E Franklin
N136LC

----- Original Message ----- 
From: "Ronnie Brown" <romott@adelphia.net>
To: <reflector@tvbf.org>
Sent: Saturday, March 06, 2004 8:12 AM
Subject: Re: REFLECTOR:Firewall penetrations (was Control Cables)


> But you still have a hot wire running back to the engine - for the
> alternator. It is a pretty healthy #8 or perhaps #10 for a 50-60 amp
> alternator.
>
> If you run the starter cable hot off the main contactor, then you don't
need
> the extra wire for the alternator. Just connect the alternator to the hot
> cable on the starter.
>
> Both methods are fine.
>
> Ronnie Brown
>
> ----- Original Message -----
> From: "Pat Shea" <xl340hp@yahoo.com>
> To: <reflector@tvbf.org>
> Sent: Friday, March 05, 2004 6:31 PM
> Subject: Re: REFLECTOR:Firewall penetrations (was Control Cables)
>
>
> | Jim,
> |
> | Actually, my starter solenoid is up front w/ the
> | master. I just didn't like that + #2 wire being
> | exposed in the engine compartment, and it just seemed
> | like everything convenient to clamp it to and
> | immediately surrounding it was grounded! Granted, if
> | it becomes shorted, you'll probably discover that the
> | next time you go to engine start. That's a lot better
> | than in flight, but probably still not a pleasant
> | experience. Anyway, cheap insurance.
> |
> | Pat
> |
> | --- Jim Agnew <jim_agnew_2@yahoo.com> wrote:
> | > Pat,
> | >
> | > A far better and safer way is to place the starter
> | > solenoid
> | > up front next to the master solenoid and then your
> | > starter
> | > + cable is dead and much safer except during
> | > starting.
> | >
> | > Jim
> | >
> | > --- Pat Shea <xl340hp@yahoo.com> wrote:
> | > > Hi Keith,
> | > >
> | > > In terms of fireproofing, what are you planning on
> | > > doing w/ the duct openings on the lower firewall?
> | > >
> | > > After Bill Huen's incident, I decided to also
> | > > firesleeve my + battery lead from the firewall to
> | > the
> | > > starter.
> | > >
> | > > Pat
> | > >
> | > >
> | > > --- KeithHallsten <KeithHallsten@quiknet.com>
> | > wrote:
> | > > > I would suggest that we all consider maintaining
> | > the
> | > > > integrity of our firewalls where control cables,
> | > > > intrument wires, etc. pass through.  Here's a
> | > link
> | > > > to an outfit that has this problem handled.
> | > > > http://www.epm-avcorp.com/tubeseal.html
> | > > >
> | > > > I plan to use this general scheme for my aileron
> | > > > control cables (with firesleeve over the entire
> | > > > length within the engine compartment) as well as
> | > the
> | > > > throttle, mixture, prop and wiring penetrations
> | > > > (with just the short sealing firesleeve).
> | > > >
> | > > > Keith Hallsten, XLFG
> | > >
> | > >
> | > > __________________________________
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> | >
> | > =====
> | > James F. Agnew
> | > Jim_Agnew_2@Yahoo.Com
> | > Tampa, FL
> | > Velocity 173 Elite Aircraft Completed & Flying
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> |
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