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To SD-8 or NOT to SD-8 . . . that is the question.

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nuckollsr(at)cox.net
Guest

Posted: Fri Feb 16, 2007 10:53 am Post subject: To SD-8 or NOT to SD-8 . . . that is the question.

At 11:31 AM 2/16/2007 -0700, you wrote:



 	  Quote: 	
		  Dear Bob,

I have been watching at the Aeroelectric Connection every now and then. 

Got a quick few questions for you:



Would a SD-8 Alternator (which I already have!) be enough to supply two 

Odyssey PC-680 batteries in a basic VFR Airplane?

I plan on having a comm-radio, a transponder, a GPS, one electronic 

ignition, and perhaps a TruTraks ADI/Autopilot.  Engine Monitoring is via 

various of Vans engine related gauges.



Oh, and Nav-Lights/Strobes for collision avoidance, but I don't plan to 

fly at nighttime.  Any thoughts?


	


    Unless you PLAN to have a vacuum system and the

    panel mounted hardware that goes along with it,

    then you have a perfectly good, engine driven power

    available to do something else.



    To my way of thinking, the cost (about $400) and

    weight (under 4#) is a fairly low cost investment

    to achieve system ENDURANCE that our TC flying

    brothers can only salivate over.



    Now, if you don't fly at night and given the

    weight in lead you're willing to carry, perhaps

    the $400/4# investment has little if any promise

    of return. That's a call you'll have to make.

    With a second alternator, could you consider

    dropping to one battery? That 4# more to delete

    16# for a net change of 12# in the right direction.

    Perhaps the investment is now more attractive.

    I'll suggest you get on the AeroElectric List

    and discuss this with the folks who are wrestling

    with the same questions.



 	  Quote: 	
		  

Also, what is the latest edition of your Aeroelectric Book and what is the 

current cost?


	


    It's up to Revision 11. If you have an R10 book

    you can update it at no charge with downloadable

    docuements at:



http://aeroelectric.com/whatsnew.html



    The book can be ordered at:



http://aeroelectric.com/Catalog/AECcatalog.html



    Bob . . .



        ----------------------------------------

        ( IF one aspires to be "world class",  )

        ( what ever you do must be exercised   )

        ( EVERY day . . .                      )

        (                  R. L. Nuckolls III  )

        ----------------------------------------

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frank.hinde(at)hp.com
Guest

Posted: Fri Feb 16, 2007 11:15 am Post subject: To SD-8 or NOT to SD-8 . . . that is the question.

Put it this way,



I have a fuel injected electric wing pumps only, IFR panel with no

vacuum system.



At 2600RPM I can just run the 430, a single fuel pump and all the

instruments and still maintain better than 12V.



The SD-8 is making nearer 12A in my opinion, So yeah in a VFR only

airplane with a mechanical fuel the SD-8 is more than adequate



Frank



--

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klwerner(at)comcast.net
Guest

Posted: Fri Feb 16, 2007 11:35 am Post subject: To SD-8 or NOT to SD-8 . . . that is the question.

Hi Frank,

 Where did you get the # of 12 Amp.  for the SD-8 in a Lycoming? 

 Konrad

 [quote]   ---

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frank.hinde(at)hp.com
Guest

Posted: Fri Feb 16, 2007 11:53 am Post subject: To SD-8 or NOT to SD-8 . . . that is the question.

From the known loads of my electrical components, fule pump  was measured at about 4A, GNS 430 at about 3.5 and so on...It maybe that some of  the published amperages of equipment are on the conservative side. So do I know  an SD-8 makes 12A?...No I don't for sure but annecdotally i think its making  quite a bit more than 8A.

  

 Cheers

  

 Frank



   From:  owner-aeroelectric-list-server(at)matronics.com  [mailto:owner-aeroelectric-list-server(at)matronics.com] On Behalf Of Konrad  L. Werner

Sent: Friday, February 16, 2007 11:34 AM

To:  aeroelectric-list(at)matronics.com

Subject: Re: To  SD-8 or NOT to SD-8 . . . that is the question.

 

 Hi Frank,

 Where did you get the # of 12 Amp.  for the SD-8 in a Lycoming? 

 Konrad

 [quote]   ---

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klwerner(at)comcast.net
Guest

Posted: Fri Feb 16, 2007 12:21 pm Post subject: To SD-8 or NOT to SD-8 . . . that is the question.

Well, from the B&C website it  shows the SD-8 to deliver 8.4Amps at 3500 RPM, which geared by 1.3 at the  vacuum pad gives you roughly 2700 Engine RPM.

 Perhaps the loads of your equipment  are max. numbers for worst case scenario?  Who knows...

  

 do not archive

 [quote]   ---

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