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emagair recommendation against Nuckoll's wiring schematic?

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aurbo(at)ak.net
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Posted: Mon Aug 13, 2007 8:19 pm Post subject: emagair recommendation against Nuckoll's wiring schematic?

Erich,

  

 I had the pleasure of attending Bob's  seminar this past weekend and I asked him about this very same  issue.

  

 First the caveat. I am not an engineer  and don't claim to know a whole lot about electrical theory or application. What  I am is curious and I do have an E and a P/mag.

  

 After reading everything I can get my  hands on and studying the Z figures Z-13 and Z-33 for the Maintenance hand prop  option I can detect only subtle differences.

  

 Emag powers the mags directly from the  main bus, so when you turn on the master there is power at the mags. The  switches on the panel for the emags are for P-lead kill switches. To do  maintenance (timing) all you have to do is turn on the master and leave the  panel switch off. But to check the alternator part of the P-Mag you have to put  a separate switch in line with the power supply to the mag. When you do a run up  check, you turn this switch off and if all is well the motor keeps on  humming.

  

 Bob's design has the power go to a switch  first. The positions on the switch are down is off, middle is for internal  power, up is for ships power. In the Z-33 schematic you then have to add a  switch (and possibly a light) to be able to cut the P-lead so you can do  maintenance (Timing). So to do the internal alternator check all you have to do  is flick the switch to the middle position and if all is well you can't tell the  difference.

  

 So what's the big difference. Both  systems use 3 switches. Both systems do the same thing just in slightly  different ways.

  

 Personally I can see an advantage in the  Emag system where each mag has it's own P-lead ground kill switch. Starting  sequence should be pretty easy. Master on, both switches in the up position,  mash the start button. 

  

 But I am a confirmed Nuckoll's advocate  and I want to see what he has to say about this. He is still here in Alaska and  touring around visiting the sights. He has assured me that when he gets back he  will dig into this and  provide help.

  

 I have sent an email to Emagair asking  the same questions. Open dialog on this question can only help us and Emagair  greatly.   



 I have not personally heard from the guys  at Emagair nor have I read anything directly from them concerning this issue.  Until I do I will keep an open mind. 

  

 Perhaps this issue is a non-event and  some of the problems stem from us folks in the field still trying to make these  new  mags act like the old style. For instance how can you perform a mag  drop check if there isn't one. Perhaps the answer is who cares. I don't know but  I am sure interested in how this turns out.

  

 Please comment at will. Any dialog is  appreciated. 

  

 Mike Ice

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ktlkrn(at)cox.net
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Posted: Tue Aug 14, 2007 7:03 am Post subject: emagair recommendation against Nuckoll's wiring schematic?

WIRE PER THE MANUFACTURERS  RECOMMENDATIONS!!! I respect Bob but why differ from what the  manufactureres want. Bob's wiring should be in consultation with Brad and  Tom.

  

 I wired per Emagair's instructions and have not had  any wiring issues. The breakers provide the ability to isolate if necessary.  When I had a mechanical failure of the Pmag (magnet came loose) I used the key  switch to isolate and go to the good mag. I then cut the breaker also to the bad  mag. 

  

 During run up I use the keyed switch for the mag  check. I don't do an idle check with the Pmags every flight. I did an initial  install check to deteremine the cutoff RPM for each mag. My idle is set higher  than the cutoff so I see no need to do idle check each run up. 

  

 I'm not an electronics person but in talking to  Brad I can see where a power interuption could potentially cause issues.  

  

 I'm missing a point I was going to say but the  bottomline, wire per the instructions and you'll be fine. 

  

 Darwin N. Barrie

 Chandler AZ 

 RV7 N717EE

 2 Pmags 260+ hours

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