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Alternate feed to Lightspeed

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charleskaluza(at)verizon.
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Posted: Wed Dec 13, 2006 8:40 am Post subject: Alternate feed to Lightspeed

We have 360 hours on our RV6A with one mag and the Lightspeed II unit  which has worked well.  We have had one kickback when starting on the  Lightspeed with a low battery.  Spoke with Klaus about using my backup  battery as an additional power source for the unit.  He thought it would be  fine as long as I used a Shottky diode (90SQ030) to prevent back feed from the  auxiliary battery to the main.  The engine starts better on the Lightspeed  but we have been starting on the mag since the kickback.

  

 I am debating using power from the E-Bus which I have activated during  start vs. running the Aux. power direct from the Aux. battery.  The second  option would allow better charging of the Aux. battery.  I worry about  excess current flow if the Aux. battery is low causing the 5 amp fuse on  the Lightspeed to blow.  Any advice?

  

 The Aux. battery is currently charged through my Rocky Mountain  monitor.

  

 Thanks for the help.

  

 Kaluza

   [quote][b]

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nuckollsr(at)cox.net
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Posted: Wed Dec 13, 2006 10:11 am Post subject: Alternate feed to Lightspeed

At 08:31 AM 12/13/2006 -0800, you wrote:



 	  Quote: 	
		  We have 360 hours on our RV6A with one mag and the Lightspeed II unit 

which has worked well.  We have had one kickback when starting on the 

Lightspeed with a low battery.  Spoke with Klaus about using my backup 

battery as an additional power source for the unit.  He thought it would 

be fine as long as I used a Shottky diode (90SQ030) to prevent back feed 

from the auxiliary battery to the main.  The engine starts better on the 

Lightspeed but we have been starting on the mag since the kickback.



I am debating using power from the E-Bus which I have activated during 

start vs. running the Aux. power direct from the Aux. battery.  The second 

option would allow better charging of the Aux. battery.  I worry about 

excess current flow if the Aux. battery is low causing the 5 amp fuse on 

the Lightspeed to blow.  Any advice?



The Aux. battery is currently charged through my Rocky Mountain monitor.


	


    This issue (and others like it) have surfaced dozens of times

    over the past 15 years. There are some products not designed to

    work in the real world of airplanes. In this case, a software

    fix to the product in question would prevent inadvertent kick-backs

    due to low bus voltage or any other stimulus.



    Adding an aux battery per Z-30 has always been the universal

    Band-Aid for this phenomenon. Further, it offers an opportunity

    to run other electrically-dependent engine accessories from

    a "protected" supply.



    No diodes needed (therefore no charging issues). Battery may

    be any practical size needed to address your endurance needs.

    Closing the contactor may be automatic . . .



See: http://aeroelectric.com/articles/lvwarn/LVWarn-ABMM.pdf



    or manual or manual with warnings . . .

See: http://www.aeroelectric.com/Catalog/AEC/9011/9011-700-1C.pdf



    Any item needed to keep an engine running should be operated

    from an always-hot battery bus . . . if you got bad smells in

    the cockpit, you need to be able to shut EVERYTHING down

    without having the engine quit.



    Bob . . .

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

      < What is so wonderful about scientific truth...is that >

      < the authority which determines whether there can be   >

      < debate or not does not reside in some fraternity of   >

      < scientists; nor is it divine. The authority rests     >

      < with experiment.                                      >

      <                            --Lawrence M. Krauss       >

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

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dave(at)abrahamson.net
Guest

Posted: Thu Dec 14, 2006 3:38 am Post subject: Alternate feed to Lightspeed

This is not an electric solution to your issue but Mattituck, from 

whom I purchased my LSE II+ and Slick Mag-equipped TMX-O360, 

recommends always starting on the mag.  By starting "better", I 

assume you mean your engine starts more quickly, with less current 

draw by the starter, but maybe the always-in-the-right-direction mag 

start ends up being a better deal...

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mlas(at)cox.net
Guest

Posted: Thu Dec 14, 2006 6:10 am Post subject: Alternate feed to Lightspeed

Kaluza,  

   

One other point to note is how you wired the Lightspeed box!  I have found that if you pick the power from the bus main feed (main bus)  

Away from the battery, this will in many cases cause the same problem.  It is imperative that you wire the ignition directly from the battery terminal, you may use what every switching or circuit protection you would like.    

   

   

Mike Larkin  

   

   

   

--

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nuckollsr(at)cox.net
Guest

Posted: Thu Dec 14, 2006 7:21 am Post subject: Alternate feed to Lightspeed

At 07:04 AM 12/14/2006 -0700, you wrote:



 	  Quote: 	
		  Kaluza,



One other point to note is how you wired the Lightspeed box!  I have found 

that if you pick the power from the bus main feed (main bus)



Away from the battery, this will in many cases cause the same problem.  It 

is imperative that you wire the ignition directly from the battery 

terminal, you may use what every switching or circuit protection you would 

like.


	


    When a device becomes sensitive to installation processes,

    it can be said "not designed to live in the real world". If

    Mattituck suggests not using the Lightspeed ignition to start

    the engine demonstrates their own assessment of shortfall in

    this product's operating characteristics.



    A simple delay in the system ability to deliver spark energy

    to something like 300 milliseconds after starter engagement

    is clearly called for so that the ignition system is not victimized

    by the short lived brown-out imposed by starter inrush currents.

    An exemplar trace of an inrush brown-out event is shown at:



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



    Many writers have indicated that they can use their Lightspeed

    system to start the engine if the ignition switch is simply left

    of until after the starter is engaged. This provides a manual

    delay work-around to ignition system activation that should be

    a part of the product's design.



    Bob . . .

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