nuckolls.bob(at)aeroelect
Guest
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 Posted: Thu May 22, 2014 7:56 am Post subject: Aerovoltz and Starter Draw (was Z-17 Schematic) |
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At 07:45 PM 5/21/2014, you wrote:
| Quote: |
<mrcc1234(at)sbcglobal.net>In
The Aerovoltz is in the mail as they say and I can report the
details as soon as I get it.
You probably spell out how to build the cap check curves in your
book so I will look into that.
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Actually the task is a bit more complicated. I did a report
on a 'leading technology' battery
http://tinyurl.com/qe6yy6c
to explore its performance numbers. Turns out to
be a pretty good 100AH battery for an RV or
some such . . .
http://tinyurl.com/nf47dgk
. . . but demonstrates 0.0063 ohms
internal resistance. A 24-volt incarnation of
this same battery would give us about 38AH at the
1-hour rate in an airplane . . . but would
have 0.024 ohms internal resistance! It wouldn't
crank its way out of a wet paper sack.
Gathering this class of data takes some test
equipment. If you would volunteer your battery
to receive about 4 charge-recharge cycles in accordance
with manufacturer's recommendations for the
test, I'd be pleased to gather and publish the
data to the OBAM aviation community.
| Quote: | Good to know that 4awg should be sufficient at least that saves a
little weight. I was having trouble figuring out how much current to
assume was being drawn during a cold start to base the wire size calc on.
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Inrush can be higher but a 200A average cranking
effort is about right . . . and by "cold" we mean
below freezing when you probably wouldn't want
to go flying anyhow. As I recall, cabin heat in
that airplane is . . . shall we say . . . marginal?
Bob . . .
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