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Dual Alternator, Response

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markn(at)fuse.net
Guest

Posted: Tue Feb 07, 2006 5:40 pm Post subject: Dual Alternator, Response

Folks:



Thanks for the response about my question of using the two alternators

simultaneously. In line with what I had thought during the design of the

electrical system, I will plan to use the SD-8 only as a back-up when/(if)

the main 40amp fellow heads to greener pastures. Of course, in line with

Bob's philosophy of exercising all things electrical from time to time, it

would make sense to shut off the main alternator and energize the SD-8 (on

downwind to landing, for example, in daylight) every now and then just to

keep the electrons knowing where to go within the rather un-used wiring and

to verify, via the voltmeter, that the SD-8 is indeed pumping and keeping

the busses filled.



Mark Neubauer

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nuckollsr(at)cox.net
Guest

Posted: Tue Feb 07, 2006 7:00 pm Post subject: Dual Alternator, Response

At 08:38 PM 2/7/2006 -0500, you wrote:



 	  Quote: 	
		  



Folks:



Thanks for the response about my question of using the two alternators

simultaneously. In line with what I had thought during the design of the

electrical system, I will plan to use the SD-8 only as a back-up when/(if)

the main 40amp fellow heads to greener pastures. Of course, in line with

Bob's philosophy of exercising all things electrical from time to time, it

would make sense to shut off the main alternator and energize the SD-8 (on

downwind to landing, for example, in daylight) every now and then just to

keep the electrons knowing where to go within the rather un-used wiring and

to verify, via the voltmeter, that the SD-8 is indeed pumping and keeping

the busses filled.


	


    You can pre-flight check it. In fact, this is one of several

    design goals for being able to turn either alternator on or off

    at any time under any conditions. During mag check at elevated

    RPM you could cycle the alternators to see that both are alive.



    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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Jekyll

Joined: 22 Feb 2006
Posts: 44

Posted: Wed Mar 29, 2006 2:36 pm Post subject: Re: Dual Alternator, Response

 	  nuckollsr(at)cox.net wrote: 	
		  At 08:38 PM 2/7/2006 -0500, you wrote:



 	  Quote: 	
		  



(from)... time to time, it

would make sense to shut off the main alternator and energize the SD-8 (on

downwind to landing, for example, in daylight) every now and then just to

keep the electrons knowing where to go within the rather un-used wiring and

to verify, via the voltmeter, that the SD-8 is indeed pumping and keeping

the busses filled.



	


    You can pre-flight check it. In fact, this is one of several

    design goals for being able to turn either alternator on or off

    at any time under any conditions. During mag check at elevated

    RPM you could cycle the alternators to see that both are alive.



    Bob . . . 	




Does this not invite load dump spikes? If not, why? I'm more than happy to add this to the run-up checks if it won't damage the systems.



Jekyll

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nuckollsr(at)cox.net
Guest

Posted: Wed Mar 29, 2006 3:03 pm Post subject: Dual Alternator, Response

At 02:36 PM 3/29/2006 -0800, you wrote:



 	  Quote: 	
		  

nuckollsr(at)cox.net wrote:

 > At 08:38 PM 2/7/2006 -0500, you wrote:

 >

 >

 > >

 > >

 > > (from)... time to time, it

 > > would make sense to shut off the main alternator and energize the 

 SD-8 (on

 > > downwind to landing, for example, in daylight) every now and then just to

 > > keep the electrons knowing where to go within the rather un-used 

 wiring and

 > > to verify, via the voltmeter, that the SD-8 is indeed pumping and keeping

 > > the busses filled.

 > >

 > >

 >

 >     You can pre-flight check it. In fact, this is one of several

 >     design goals for being able to turn either alternator on or off

 >     at any time under any conditions. During mag check at elevated

 >     RPM you could cycle the alternators to see that both are alive.

 >

 >     Bob . . .

Does this not invite load dump spikes? If not, why? I'm more than happy to 

add this to the run-up checks if it won't damage the systems.


	


     Not if they're designed out of the system. This has

     never been an issue with contemporary certified systems.

     It's not an issue for any of the B&C products.

     It's this designer's goal to see that they're not

     an issue with OBAM aircraft installations using

     any brand of internally regulated alternator.



     It's my intent to offer a means by which any alternator may

     be turned on or off at any time under any conditions for any

     reason without regard or concern for damaging anything.



        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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