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Need help in reviewing Z10/8 arch for dual Lightspeed ign.

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plevyakh

Joined: 10 Jan 2011
Posts: 39

Posted: Sun Mar 06, 2011 4:43 pm Post subject: Need help in reviewing Z10/8 arch for dual Lightspeed ign.

Folks,

I've made up my electrical system plan and sure would appreciate some fresh eyes and input.   I'm an electrical sys neophyte....but trying hard to get smarter and not do anything dumb.  I’ve read the AEC and started with a Z10/8 architecture as my base.



Here’s my GlaStar mission profile:

-  Cross country IFR capable airplane that enables me to do over water flying down the Bahama island chain, and reach deep northern Canada backcountry strips and lakes for camping and fishing.   I plan on doing some serious cross country flying. 



Some challenges I'm still scratching my head over include:



1)  How best to wire the dual Lightspeed electronic ignitions to ensure they see higher than 8.5V during engine start to minimize chance of starter kickback.   I'm using a Skytec 149-12LS starter (PMG) which has the high current draw at start.   Should I move both Lightspeed ignitions to a Brownout Battery Bus?  



2) My batteries are also located in the tailcone due to W&B needs with about a 12ft run aft of the firewall.  I estimated the starter would see about 10.3V after losses.  Does this sound right?



3)  How best to wire my dual Grand Rapids EFIS/AHRS and the Engine Info System (EIS 4000) to enable them to be ON during engine start.   I want the EIS on to monitor engine vitals (oil pressure).   For the EFIS/AHRS…it can take up to two minutes to align the AHRS, and I'd prefer not to burn gas, make noise, and blow stuff around while I wait for alignment.  I’d like everything ready, checklist complete up to the point of "ignition", then start up, and taxi away.  I’m considering moving the 2nd EFIS/AHRS to the Endurance bus as well, or a Brownout Battery Bus.



4) Overall does the wiring schematic make sense?  What mistakes did I make?  Can it be simplified?



I've attached two versions of the architecture.  One is printable (4 pages) to read, and the other screen viewable.  I’ve also attached my electrical bus load analysis.



Thanks in advance for any inputs!

Howard

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Glastar Electrical Load Analysis_6Mar2011.pdf

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Bus load analysis

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Glastar Electrical Load Analysis_6Mar2011.pdf

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PRINTABLE_GLASTAR SCHEMATIC V0_6MAR2011 FOR REVIEW.pdf

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4 page view - use for printing

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GLASTAR SCHEMATIC V0_6MAR2011 FOR REVIEW.pdf

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Single page view - use for screen viewing

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_________________
Howard Plevyak
GlaStar / Cincinnati, Ohio

trigo(at)mail.telepac.pt
Guest

Posted: Mon Mar 07, 2011 5:58 am Post subject: Need help in reviewing Z10/8 arch for dual Lightspeed ign.

Hi Howard  

   

I like very much your load analysis, and your electric schematic as well, and I will probably use it in a future project, or in refurbishing my current aircraft, which has an electric dependant engine.  

   

Our guru (‘lectric Bob) already answered your questions, and I have not enough knowledge to answer your questions 1 to 3 or comment on his answers.  

   

I will just comment on some details of your architecture, and make some questions in order to learn something else.  

   

  a) In the SD-8 circuit, you have put a “Low Volts Aux Alt” LED light that seems it will be permanently On, since it is directly connected to the (+) terminal of the Main Battery through the NC terminal of the Aux Alt S704-1 relay. Is that wrong on your schematic, or am I wrong?  

   

  b) Why did you connect the Fuel Primer pump to your “always hot” Main Battery Bus?  

   

  c) In this “always hot” Main Battery Bus, you have a connection (lower left) called “Endurance Bus”, which is not connected to the Endurance Bus, but rather to the COM terminal of the S704-1 “Brownout Battery Relay, which is connected to the (+) terminal of the Aux Battery, except when you push the Start button . Would you please explain this connection and this relay function?  

   

Regards  

Carlos  

   

   

[quote] --

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