klehman(at)albedo.net
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 Posted: Mon Jan 07, 2008 3:28 pm Post subject: Electrical System Reliability (and other ???) |
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FWIW I run two small 9AH batteries with Z-14. With an electrically
dependent engine running on a battery bus it is not overly difficult to
leave something running on a battery bus. My Low voltage warnings are
not active unless the EIS is powered off the main bus so it does not
warn if a light or battery bus item is left on. While it was definitely
not a design goal and I'm not recommending it - it is a benefit of Z-14
with equal size batteries that either one of those little Dekka
batteries will indeed start the engine. Closing the x-feed relay will
charge the other battery. A little hard on the dead battery for sure but
I've seen no evidence of overheating or outgassing while doing the
above. Mind you my largest alternator is 40 amps and it puts out less
than that on the ground and even less when other loads are subtracted.
Z-14 architecture has pleased me with unexpected benefits a couple of
times now.
A friend with a misbehaving electrical system would have really liked a
Z-14 recently when we were a long way from home or spare parts...
Ken
| Quote: | > B - One of the mission requirements is backcountry
> operations. Given that, one my design points was the ability to
> start the plane with a completely dead primary (cranking)
> battery, say as a result of leaving the master on.
Why would you even consider that? You're obviously very
concerned about NOT having necessary things operate 100%
of the time but stacking lots of hardware on top of the
probability that a pilot walks away from the airplane leaving
things turned on is running off in the wrong direction.
The most reliable system is that which has the fewest parts.
The most reliable flight system has a minimum of options for
the pilot consider when something is not working. A simple
flashing low voltage warning light (comes with the LR3) tells
you that a master switch is ON after engine shutdown . . .
so that scenario is unworthy of consideration . . .
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