nuckolls.bob(at)aeroelect
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 Posted: Thu Jul 10, 2014 1:03 pm Post subject: RV-7 wireing questions (OOPS) |
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I hit the 'send' button too quick. Check out the articles
on avionics master switches at http://tinyurl.com/mr2jk8g
Also, I recommend you join us on the AeroElectric-List,
http://tinyurl.com/57wytb . . . it's a good thing to
share a conversation about such matters with lots of
other builders who may ponder such issues themselves . . .
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At 01:17 PM 7/10/2014, you wrote:
Hey Bob, I have your book Aeroelectric Connection 2005 and I am
building an RV-7. Great book by the way (I am a super beginner). I
am going to use your figure Z-11 generic light aircraft electrical
system diagram for pretty much all of my system but have a few questions.
I want a master switch and an avionics switch on my panel so I can
start my engine before I power up my avionics
Okay, why do you want to do this? No such feature is
suggested on any of the Z-figures . . . the value
for an avionics master switch was poorly perceived
when it was birthed (about 1968). Today, rudimentary
design skills make virtually every appliance
immune to what ever the system might throw at it . . .
including the cranking of engines.
Some readers have proffered the idea that turning
avionics loads off will enhance cranking performance. . .
an idea without foundation in physics for an airplane
with a properly maintained battery. If you're willing
to go flying with a battery that might not get the
engine started if it were presented with a few amps
additional load, then I suggest there's value in
a review of your design goals as they drive risks.
Don't get me wrong, if you WANT any switch in the
airplane for ANY purpose, fine by me. I suggest
there is value in understanding the exactly what
the switch will (or will not) do for you . . .
and how it figures into your assessment of risks.
Bob . . .
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