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P-mags

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Terry Watson

Joined: 09 Jan 2006
Posts: 290
Location: Seattle, WA USA

Posted: Tue Feb 20, 2007 10:49 am Post subject: P-mags

This is an excerpt from a message to the Matronics Engines list this

morning, posted by Mike Larkin:



"  As for the P-mag, I recovered an RV-7 from a highway two weekends ago

when Both P-mags failed.  Guess what, the electrical system worked

perfectly......"



Since E-mags and P-mags have been a subject on this list, I thought I would

pass it on. Does anyone know the story?



Terry

AV8ORJWC

Joined: 13 Jul 2006
Posts: 1149
Location: Aurora, Oregon "Home of VANS"

Posted: Tue Feb 20, 2007 11:54 am Post subject: P-mags

I was not aware the four cylinder P mag was yet available for Prime

Time.  Could this have been dual E mags?



John Cox



--

harley(at)AgelessWings.co
Guest

Posted: Tue Feb 20, 2007 12:04 pm Post subject: P-mags

John...

 

 The four cylinder P-Mag has been available right from the start...I've ordered one (now have two) in September of 2004. 

 The six cylinder version is still waiting release.

 

 www.emagair.com/FAQ.htm

 

 Harley Dixon

 

 

 John W. Cox wrote: [quote]   [quote]--> AeroElectric-List message posted by: "John W. Cox" <johnwcox(at)pacificnw.com> (johnwcox(at)pacificnw.com)  I was not aware the four cylinder P mag was yet available for Prime Time.  Could this have been dual E mags?  John Cox    --

frank.hinde(at)hp.com
Guest

Posted: Tue Feb 20, 2007 12:27 pm Post subject: P-mags

Nope Dual P mags. They did NOT fail. I believe ONE of them went to very

advanced timing. It has the effect of fouling up the timing completely

because once the charge has been lit the second spark doesn't do

anything.



There is a long discussion on the Vansairforce website about it.



Frank

RV-7a 



--

HCRV6(at)comcast.net
Guest

Posted: Tue Feb 20, 2007 5:44 pm Post subject: P-mags

Frank,



Help me out here, if that isn't a "failure", just what would you call it?  In my book, any mechanical screw up that causes an unplanned landing sure fits the definition of a failure.



--

Harry Crosby

RV-6 N16CX, 312 hours



 -------------- Original message ----------------------

From: "Hinde, Frank George (Corvallis)" <frank.hinde(at)hp.com>

[quote] 

 <frank.hinde(at)hp.com>

 

 Nope Dual P mags. They did NOT fail. I believe ONE of them went to very

 advanced timing. It has the effect of fouling up the timing completely

 because once the charge has been lit the second spark doesn't do

 anything.

 

 There is a long discussion on the Vansairforce website about it.

 

 Frank

 RV-7a 

 

 --

AV8ORJWC

Joined: 13 Jul 2006
Posts: 1149
Location: Aurora, Oregon "Home of VANS"

Posted: Tue Feb 20, 2007 6:35 pm Post subject: P-mags

I guess my attempt at tact by saying not yet available for Prime Time

was misleading.  So... the P mag is ready for Prime Time and does out

perform an archaic magneto.



John Cox

#40600

--

frank.hinde(at)hp.com
Guest

Posted: Wed Feb 21, 2007 6:50 am Post subject: P-mags

Fair point Harry,



I guess my conjecture was that one of the P mags could have been turned

off and the engine would have resumed normal operation...I just wish I'd

though of it when it happened to me...Of course my engine just ran hot,

i.e did not causean engine stoppage.



Frank



 



--

khorton01(at)rogers.com
Guest

Posted: Wed Feb 21, 2007 8:30 am Post subject: P-mags

On 21 Feb 2007, at 09:49, Hinde, Frank George (Corvallis) wrote:



 	  Quote: 	
		   

 (Corvallis)" <frank.hinde(at)hp.com>



 Fair point Harry,



 I guess my conjecture was that one of the P mags could have been  

 turned

 off and the engine would have resumed normal operation...I just  

 wish I'd

 though of it when it happened to me...Of course my engine just ran  

 hot,

 i.e did not causean engine stoppage.




	


It is too much to expect for you to suddenly become very bright after  

the incident occurs, and decide to try turning one ignition off.  It  

is far better to put that step in your Rough Running Engine and  

Engine Failure checklists now.  Then, whenever the problem occurs,  

the fact that you are familiar with your emergency checklist should  

hopefully trigger you to try turning one ignition off at a time.



Kevin Horton

RV-8 (Finishing Kit)

Ottawa, Canada

http://www.kilohotel.com/rv8

nuckollsr(at)cox.net
Guest

Posted: Wed Feb 21, 2007 8:09 pm Post subject: P-mags

At 02:49 PM 2/21/2007 +0000, you wrote:



 	  Quote: 	
		  

<frank.hinde(at)hp.com>



Fair point Harry,



I guess my conjecture was that one of the P mags could have been turned

off and the engine would have resumed normal operation...I just wish I'd

though of it when it happened to me...Of course my engine just ran hot,

i.e did not causean engine stoppage.



Frank


	


    Since this is a failure mode unique to the e/p-mag

    products, perhaps words to guide the pilot in conducting

    an in-flight diagnosis and remedy should be added to

    the POH for any aircraft that carries one or more

    Emagair products.



    Bob . . .

frank.hinde(at)hp.com
Guest

Posted: Thu Feb 22, 2007 6:39 am Post subject: P-mags

Yes and in my head at least I intend to do this...I must say it did

occur to me (briefly) but I was close to being overwhelmed as I was

approaching a fog bank that I had to make an ILS approach through...It

was 400ft ceiling so I knew we could make it but  it takes some nerve to

shut down a mag in that situation, bearing in mind I really had no idea

what was happening at the time. Excuses excuses..



With hindsight, yes just shut down a mag, does it get better? NO,

re-enable and shutdown the other one.



Cheers



Frank 



--

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