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Dual Alternator, Response

 
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markn(at)fuse.net
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PostPosted: Tue Feb 07, 2006 5:40 pm    Post subject: Dual Alternator, Response Reply with quote

Folks:

Thanks for the response about my question of using the two alternators
simultaneously. In line with what I had thought during the design of the
electrical system, I will plan to use the SD-8 only as a back-up when/(if)
the main 40amp fellow heads to greener pastures. Of course, in line with
Bob's philosophy of exercising all things electrical from time to time, it
would make sense to shut off the main alternator and energize the SD-8 (on
downwind to landing, for example, in daylight) every now and then just to
keep the electrons knowing where to go within the rather un-used wiring and
to verify, via the voltmeter, that the SD-8 is indeed pumping and keeping
the busses filled.

Mark Neubauer


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nuckollsr(at)cox.net
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PostPosted: Tue Feb 07, 2006 7:00 pm    Post subject: Dual Alternator, Response Reply with quote

At 08:38 PM 2/7/2006 -0500, you wrote:

Quote:


Folks:

Thanks for the response about my question of using the two alternators
simultaneously. In line with what I had thought during the design of the
electrical system, I will plan to use the SD-8 only as a back-up when/(if)
the main 40amp fellow heads to greener pastures. Of course, in line with
Bob's philosophy of exercising all things electrical from time to time, it
would make sense to shut off the main alternator and energize the SD-8 (on
downwind to landing, for example, in daylight) every now and then just to
keep the electrons knowing where to go within the rather un-used wiring and
to verify, via the voltmeter, that the SD-8 is indeed pumping and keeping
the busses filled.

You can pre-flight check it. In fact, this is one of several
design goals for being able to turn either alternator on or off
at any time under any conditions. During mag check at elevated
RPM you could cycle the alternators to see that both are alive.

Bob . . .

< What is so wonderful about scientific truth...is that >
< the authority which determines whether there can be >
< debate or not does not reside in some fraternity of >
< scientists; nor is it divine. The authority rests >
< with experiment. >
< --Lawrence M. Krauss >


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Jekyll



Joined: 22 Feb 2006
Posts: 44

PostPosted: Wed Mar 29, 2006 2:36 pm    Post subject: Re: Dual Alternator, Response Reply with quote

nuckollsr(at)cox.net wrote:
At 08:38 PM 2/7/2006 -0500, you wrote:

Quote:


(from)... time to time, it
would make sense to shut off the main alternator and energize the SD-8 (on
downwind to landing, for example, in daylight) every now and then just to
keep the electrons knowing where to go within the rather un-used wiring and
to verify, via the voltmeter, that the SD-8 is indeed pumping and keeping
the busses filled.


You can pre-flight check it. In fact, this is one of several
design goals for being able to turn either alternator on or off
at any time under any conditions. During mag check at elevated
RPM you could cycle the alternators to see that both are alive.

Bob . . .


Does this not invite load dump spikes? If not, why? I'm more than happy to add this to the run-up checks if it won't damage the systems.

Jekyll


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nuckollsr(at)cox.net
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PostPosted: Wed Mar 29, 2006 3:03 pm    Post subject: Dual Alternator, Response Reply with quote

At 02:36 PM 3/29/2006 -0800, you wrote:

Quote:

nuckollsr(at)cox.net wrote:
> At 08:38 PM 2/7/2006 -0500, you wrote:
>
>
> >
> >
> > (from)... time to time, it
> > would make sense to shut off the main alternator and energize the
SD-8 (on
> > downwind to landing, for example, in daylight) every now and then just to
> > keep the electrons knowing where to go within the rather un-used
wiring and
> > to verify, via the voltmeter, that the SD-8 is indeed pumping and keeping
> > the busses filled.
> >
> >
>
> You can pre-flight check it. In fact, this is one of several
> design goals for being able to turn either alternator on or off
> at any time under any conditions. During mag check at elevated
> RPM you could cycle the alternators to see that both are alive.
>
> Bob . . .
Does this not invite load dump spikes? If not, why? I'm more than happy to
add this to the run-up checks if it won't damage the systems.

Not if they're designed out of the system. This has
never been an issue with contemporary certified systems.
It's not an issue for any of the B&C products.
It's this designer's goal to see that they're not
an issue with OBAM aircraft installations using
any brand of internally regulated alternator.

It's my intent to offer a means by which any alternator may
be turned on or off at any time under any conditions for any
reason without regard or concern for damaging anything.

Bob . . .
< What is so wonderful about scientific truth...is that >
< the authority which determines whether there can be >
< debate or not does not reside in some fraternity of >
< scientists; nor is it divine. The authority rests >
< with experiment. >
< --Lawrence M. Krauss >


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