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nuckolls.bob(at)aeroelect
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 Posted: Mon Sep 05, 2011 9:07 am Post subject: Initial experience with dual Odyssey PC680s powering RV-10 |
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At 09:42 AM 9/5/2011, you wrote:
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<wayne.gillispie(at)yahoo.com>
Try running a #0 ga wire external along with a dedicated ground just
for a test start. Even a long set of jumper cables ran parallel can
tell you we have wire size issues.
Our #2 ga is too small for the log run and current draw. Since Van
recommended that is what I have and it would be alot of work to
change now. After almost finished I have modified most of Vans
shortcomings, but not this one.
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There is no really good reason to NEED #0
fat wires in a small airplane. There are
tens of thousands of light aircraft flying
with #2 feeders . . . even with the batteries
in back. Thousands more flying with #4 fat-wires
with batteries in front.
A sad but irrefutable fact is that most starter
manufacturers do not speak to efficiency at their
intended task. About 10 years ago, I e-mailed
4 manufacturers asking if they would provide
samples for testing on a dynamometer for the purpose
of gathering data for a Lightplane Maintenance article.
Only one of the four offered to provide test samples.
Hence, no data, no article, continued ignorance amongst
system integrators and TC/OBAM aircraft customers.
One generally doesn't get away with such behavior
in the TC aircraft world. I've wrestled with reluctant
suppliers . . . but ultimately won the day when they
considered the potential for NOT getting their product
listed on the airplane's type certificate.
Bottom line is that there are good reasons based
on simple ideas in physics that make one starter
behave differently from another starter in the same
installation. 90% of the time, it has nothing to
do with the way the starter is installed/wired.
A particular combination of components can appear
to indicate a 'bad battery' when in fact the starter
is just not very efficient. It's not always a bad
idea to trade off efficiency for weight or price . . .
but there are practical limits.
Bob . . .
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rleffler
Joined: 05 Nov 2006
Posts: 680
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| Posted: Mon Sep 05, 2011 11:03 am Post subject: Initial experience with dual Odyssey PC680s powering RV-10 |
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I sent an email off earlier today to Vans, Lycoming, and Sky-Tec requesting
clarification on Sky-Tec's recommendation to use the 149-NL over the
Vans/Lycoming supplied 149-12LS.. The following is the response that I
received from Rich at Sky-Tec. I have his permission to re-post his email.
He doesn't participate in the forums, but welcomes anyone to communicate
directly with him via email or telephone.
bob
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_________________
Bob Leffler
N410BL - Phase I
http://mykitlog.com/rleffler |
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