jpx(at)Qenesis.com
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 Posted: Thu Feb 12, 2009 10:06 am Post subject: Revision 12 Z Figures |
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Some possible updates to Z figures:
Z15K3p2
2nd paragraph, second line, change "Busses at" to "Busses are"
3rd paragraph, 5th line, "crancase" to "crankcase"
3rd paragraph, 6th line, "leas" to "least"
4th paragraph, 1st line, ""bee" to "been"
Z17 On diagram, label Dynamo as B&C SD-8 and regulator as B&C PMRIC-14
Z25 - Self-excitation components missing.
possibly show the SD-8 wires twisted ?
If you are intentionally deleting the self-excitation feature, delete
references to it in Z10-8A2 and Note 25.
If you want to promote the self-excitation feature, add reference to it
in Z16, Z17
Note 4 - Perhaps update the discussion here. When I read this the first time,
my impression was that I could choose a fuselink by selecting 4AWG smaller
than the wire to be protected. Discussions with you on this list indicated
that this was an over-simplification and that I should only use fuselinks
as shown in the Z diagrams. Perhaps additional discussion here to explain
some details, or some caution that additional learning is required to
select fuselink sizes.
Note 25. I have 1K, Z21A shows 3K resistor for SD-8 self-excitation.
Wish List:
I am particularly fond of Z13/8. As a step up, using Emagair
ignitions and an SD-8 aux alternator, I would suspect many builders
would also opt for B&C's
LR3C-14 regulator instead of the generic Ford regulator. Perhaps draw it that
way ?
With two electrically dependent ignitions, it seems to me the holy grail of
architectures would be completely isolated electrical systems as the only true
guarantee of no single fault causing disaster. Z14 is much more than
needed to
accomplish this goal. A major revision to Z13/8 would add a small
battery to go with the SD-8, feeding the second ignition from an
independent battery bus.
In the event of a main alternator failure, a cross-feed relay would allow the
SD-8 to feed the endurance bus. The aux battery would not be used to feed the
starter motor. If you believe this a worthy design goal, perhaps add
a drawing
to illustrate it ?
Jeff Page
Dream Aircraft Tundra #10
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