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Z-14 FADEC Version Question with P.S.

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nuckollsr(at)cox.net
Guest

Posted: Thu Feb 23, 2006 7:34 am Post subject: Z-14 FADEC Version Question with P.S.

At 11:31 AM 2/22/2006 -0800, you wrote:



 	  Quote: 	
		  

<dsmit132(at)bellsouth.net>

nuckollsr(at)cox.net wrote:

 > At 11:13 AM 2/21/2006 -0800, you wrote:

 >

 >

 > >

 > >

 > >

 > > Sorry I didn't give you enough info Bob.

 > >

 > > It's a Mattituck IOF-360 with B&C starter and 60A alternator - no vacumn

 > > or mechanical gyros. It's all electric - all glass panel. It will be IFR

 > > with Garmin GMA-340 Audio Panel, GNS-480 GPS/Nav/Com, GTX-330 Xpondr

 > > (Traffic), SL-40 Com, TruTrak DigiFlight II VSGS, TruTrak ADI, GRT 4000

 > > EIS and two Horizon  I EFISs with XM Weather. Much of this equipment 

 will

 > > accept power from two sources. My backup to the Garmin equipment is the

 > > TruTrak ADI and the EIS 4000 option of AS and Altitude. Plus the TruTrak

 > > auto pilot.

 > >

 > > My plan is to use the Figure Z-14 FADEC and eliminate the aux alternator

 > > and regulator.

 > >

 > >

 >

 >     Then what you REALLY need is Z13/8 with a second battery.

 >

 > You have me confused Bob. I have a FADEC so why would I use the Z-13/8 

 - all electric airplane on a budget with P-Mags instead of the Z-14 

 FADEC? I just felt that with a FADEC engine with two PC-680s that I don't 

 need a second alternator.


	


   Your confusing the Z-figures as illustrations of ARCHITECTURE with

   recommended combinations of hardware to end up in the finished

   design. You don't HAVE to put p-mags in for Figure Z-13/8. Figure

   Z-19 suggests an architecture for an electrically dependent engine

   having one alternator and two batteries. But again, don't focus

   on individual equipment items illustrated but the plan-a/plan-b

   operational aspects offered by the architecture. Figure Z-14 with

   a cross-feed contactor is an architecture for totally isolated,

   independent, dual electrical systems. Since you plan only one

   alternator, Z-14 is not applicable. In simplest terms, Z-19

   is an expanded version of Z-11 with a second battery added along

   with features to manage control and monitoring philosophies that

   you may find attractive. I suggested Z-13/8 because you'll have

   a vacuum pump pad with a cover plate over it. It seems a small

   cost and weight penalty to take advantage of that pad with a

   4# alternator installation. But Z-11 with dual batts, or Z-19

   is closer to what you're looking for. You can always add the /8

   feature to either system at a later date.



   Bob . . .

   P.S. please note that the FADEC version of Z-14 simply eliminates

   the automatic paralleling of batteries for cranking so that the

   second battery can be held in isolated reserve to support FADEC

   systems not designed to live in the real world. Many designers

   of the new electronic support systems for engines have put

   some aspects of DO-160 in the "too hard" pile and choose not

   to live with starter current brown-outs . . .



   (See http://www.aeroelectric.com/Pictures/Curves/99_Saturn_SL1.jpg )



    . . . common to every vehicle that cranks the engine from a battery.

   The result is that the system integrator (you) need to supply

   stand-alone power to keep you engine's electronics from

   wandering into the weeds during cranking. This is the prime

   driver for a second battery.



   Bob . . .

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dannylsmith

Joined: 21 Feb 2006
Posts: 9
Location: Panama City Beach, FL

Posted: Fri Feb 24, 2006 9:00 am Post subject: Re: Z-14 FADEC Version Question with P.S.

Thanks for the help Bob!

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Danny

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