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Flight Test Architecture

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lee.logan(at)gulfstream.c
Guest

Posted: Mon Jul 07, 2008 7:11 am Post subject: Flight Test Architecture

Good information, Bob, thanks for taking the time to answer my questions

about electrical system performance.  Good point too, that Z-13/8 with a

big battery back-up is really designed to get you to destination, not just

back on the ground safely.  As I said, "...I would already be headed for

good weather/divert/home base/whatever if the SD-8 let go" too, but that is

clearly situationally dependant (the "whatever" clause).



You also said you think a voltmeter indicating SD-8 performance would be

useful.  Are there any schematics/parts recommendations available for that?

I'd prefer to have the voltmeter on my EDM-900C do double duty depending

upon which alternator were supplying power to the system, but don't know if

that is possible or not.



Thanks again for the recommendations.



Lee...

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nuckolls.bob(at)cox.net
Guest

Posted: Wed Jul 09, 2008 1:15 pm Post subject: Flight Test Architecture

At 11:05 AM 7/7/2008 -0400, you wrote:

 	  Quote: 	
		  

Good information, Bob, thanks for taking the time to answer my questions

about electrical system performance.  Good point too, that Z-13/8 with a

big battery back-up is really designed to get you to destination, not just

back on the ground safely.  As I said, "...I would already be headed for

good weather/divert/home base/whatever if the SD-8 let go" too, but that is

clearly situationally dependant (the "whatever" clause).



You also said you think a voltmeter indicating SD-8 performance would be

useful.  Are there any schematics/parts recommendations available for that?

I'd prefer to have the voltmeter on my EDM-900C do double duty depending

upon which alternator were supplying power to the system, but don't know if

that is possible or not.



Thanks again for the recommendations.


	


   If you plan to run the EDM-900 from the e-bus, then you're

   already covered. Just know that "normal" operations are

   expected to be about 0.7 volts lower than actual bus. I.e.,

   about 13.5 to 13.9 volts with the alternator set to 14.2 to

   14.6 volts. Running the ship's voltmeter from the e-bus allows

   for any time testing of the alternate feed path. The

   e-bus alternate feed switch can be closed and you'll see

   the voltage "jump up" slightly showing that the alternate

   feed path is good and the normal feed path diode is good.



   If your EDM-900 runs from the main bus, you could

   consider a small voltmeter. I've been fiddling with

   an expanded scale device (10-15v) meter based on the

   same movement as our loadmeter. See:



https://matronics.com/aeroelectric/Catalog/AEC/9007/9007.html



   it would have a scale like this:



http://aeroelectric.com/Pictures/Instruments/Expanded_Scale_VM_Proto.jpg



   but the overall appearance of the device would match

   the loadmeter. I think B&C has a little digital

   voltmeter. Also consider:



http://www.egauges.com/vdo_mult3.asp?Type=Voltmeter12&Series=Cyber_Red&Units=E



  Bob . . .

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