nuckolls.bob(at)cox.net
Guest
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 Posted: Thu Oct 11, 2007 9:36 am Post subject: Jabiru alternators |
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At 09:31 PM 10/10/2007 +1000, you wrote:
| Quote: | Bob:
I am a new member to the aeroelectric list, and have only recently
downloaded a copy of you book. I posted a message a couple of days ago
about Jabiru alternators, and so far have only received a replies from
only one person. I have attached the messages below.
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<snip>
| Quote: | >
> I have also seen a couple of schematics on builders web sites with
> slightly different approaches. One used the alternator switch to both
> disconnect the regulator sense line from the main bus and control a
> relay connecting the regulator output line to the main bus, but no
> capacitor. The other had a relay only in the regulator output line.
> The sense line was left connected to the main bus, and would therefore
> have still been at +12V ( at least until the battery discharged) if
> the alternator switch was opened. Once again, no capacitor. What are
> the advantages or problems associated with these approaches?
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There are many approaches to system architecture
and I've been asked many times to convince someone
as to the value of one approach over another. I
crafted the words in Chapter 17 to explain the
simple ideas behind the drawings published in
Appendix Z. It's beyond the scope of my mission
and hours-in-the-day to do critical design review
on the myriad of alternative schemes.
Virtually every alternative offers some level of
performance and functionality . . . and is not
intrinsically "unsafe" as long as the design rules
for fusing, wire sizing, ov protection, etc. are
observed. Keep in mind that only an exceedingly
tiny percentage of serious accidents begin with
electrical system problems . . . and most of those
had nothing to do with architecture.
A design goal for the Z-figures is to craft an
elegant solution supported by a published
operating and design philosophy. I am in no way
suggesting that the 'Connection offers an "ultimate
solution." The 'Connection is like a favorite
restaurant that serves dishes worthy of
your continued consumption because they're
consistent and comfortably predictable. If
you understand the ingredients (simple ideas)
that go into any/all recipes for success, then the
recipe that ultimately satisfies your own design
goals becomes a matter of personal taste.
Bob . . .
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( "Problems are the price of progress. )
( Don't bring me anything but trouble. )
( Good news weakens me." )
( -Charles F. Kettering- )
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