Today's Message Index:
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1. 07:51 AM - Re: Re: Voltage Regulator Output (Robert L. Nuckolls, III)
2. 07:55 AM - Re: Re: Voltage Regulator Output (Robert L. Nuckolls, III)
3. 08:02 AM - SD-8 Performance (Robert L. Nuckolls, III)
4. 03:43 PM - faulty push to talk (bob noffs)
5. 06:45 PM - Re: faulty push to talk (Robert L. Nuckolls, III)
Message 1
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| Subject: | Re: Voltage Regulator Output |
At 01:23 PM 12/27/2010, you wrote:
><michaelherder@beckgroup.com>
>
> . . . .Since I have battery backup up on my EFIS and GPS, I'm not
> that concerned. I can still land safely, which is all I'm really looking for.
>
>The EIS should give me ample visual and audio warning if I set it
>for a little lower threshold value, say 13.8V.
Michael, It's not clear to me that you've acquired
an understanding of the simple-ideas that go into
a recipe for success for your airplane's electrical
system. There's a recommended library of information
but in particular, a chapter on system reliability
published in the AeroElectric Connection. You can
get printed/bound copies for a nominal fee or download
it and print yourself at no cost other than printer
expenses.
You're correct that OV conditions are rare and
one of the least concerns for reducing risk . . .
which is why chapter 17 goes to some length attempting
to order various system frailties and failures in
order of criticality.
The architecture diagrams offered in appendix Z
strive to bring the best legacy design goals from
TC aviation into the new "kitchen". Owner Built
and Maintained aviation is crafting new recipes
specific to what the builder wants/needs . . .
not what the FAA or program managers dictate.
At the same time, we strive to drive risks to
still lower numbers.
If you've not taken advantage of the resources
cited, I would encourage you to do so. It goes
toward increasing your comfort and confidence in
the operation of your airplane.
Happy new year!
Bob . . .
Message 2
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| Subject: | Re: Voltage Regulator Output |
At 01:23 PM 12/27/2010, you wrote:
><michaelherder@beckgroup.com>
P.S. Here's some alternator noise signatures for
PM and WF3P (wound-field/three-phase) alternators:
http://www.aeroelectric.com/Pictures/Curves/Safari_Bus_Noise_1.gif
http://www.aeroelectric.com/Pictures/Curves/Safari_Bus_Noise_2.gif
http://www.aeroelectric.com/Pictures/Curves/SD-8_Noise_Data.pdf
The SD-8 (and similar PM alternators) does
not present an unusually severe problem with
respect to noise.
Bob . . .
Message 3
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| Subject: | SD-8 Performance |
I'd forgotten about this plot we crafted for B&C 6 years
ago . . .
http://www.aeroelectric.com/Reference_Docs/Alternator_Data/SD8-Performance.pdf
This data was gathered on the test bench and then
plotted against engine RPM for the two common drive
pad ratios: Lycoming 1:1.3 and Continental 1:1.5
There are two curves. One that predicts usable output
at minimum battery maintenance voltage of 13.8. The
second curve shows output available if the bus is pulled
down to 12.5 volts . . . not so low as to begin discharging
the battery but also not high enough to push energy back
into the battery.
It was this data gathering exercise that suggested one
could plan to load the SD-8 to as much as 10A under
some circumstances.
Bob . . .
Message 4
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| Subject: | faulty push to talk |
hi all,
my friend bought a kitfox and when the ptt button is pressed the rotax
tach. goes to far right and so does the gas gauge. the intercom and radio
all continue to work normally. any hints where he should look first? he
isolated the power to the ptt by jumping at the battery but no change.
bob noffs
Message 5
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| Subject: | Re: faulty push to talk |
At 05:39 PM 12/28/2010, you wrote:
>hi all,
> my friend bought a kitfox and when the ptt button is pressed the
> rotax tach. goes to far right and so does the gas gauge. the
> intercom and radio all continue to work normally. any hints where
> he should look first? he isolated the power to the ptt by jumping
> at the battery but no change.
Does it do it with the radio turned off? This has the
flavor of an RF interference problem. You need to
dummy load the transceiver's antenna line . . .
http://aeroelectric.com/Pictures/Tools/RF_Antenna_Test_Tools/DummyLoad.jpg
and see if the problem goes away. Are these perchance
Van's instruments? I've had two of them in my shop,
an ammeter and a fuel gauge as I recall. Both were
extraordinarily vulnerable to strong RF in the
cockpit.
Bob . . .
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