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Z13-8 N P-Mags

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jpx(at)Qenesis.com
Guest

Posted: Sun Jan 27, 2008 10:09 pm Post subject: Z13-8 N P-Mags

You might think wiring up an electronic mag might be simple 



Replacing the S700-2-10 with a S700-2-1 as I indicated in my previous  

post isn't the correct solution.  It does allow removing external  

power to test the internal alternator, but in normal use, it removes  

external power before grounding the P-Lead, which is clearly stated by  

E-Mag as not the way to shut down the engine 



At one point I had the design such that I used only three switches to  

control power/ground to the mags, allowing testing and with a position  

to engage the starter.

However, it used three expensive switches and I have encountered  

poorer reliability with spring return types.  The main problem really,  

is that the power to both mags was routed through one single switch.   

Since it is not being moved in flight, it is unlikely to fail, but ..



My current plan is to use four of the simplest single-pole on-off  

switches, two for power and two for p-lead grounding, plus a push  

button for start.  So that is a total of five switches, but much  

simpler and cheaper components and the plane will still fly if any one  

of them fails.



I like the simple flow of operating the switches.  However, I am not  

completely comfortable without a keyswitch, which would be difficult  

to include in this design.  I do not like keyswitches, but there is a  

clear delineation between someone being (or not) permitted to start  

the aircraft if they are in possession of the key.  To prevent  

starting, the key would need to disconnect mag power to avoid hand  

propping.  The secret switch under the dash, used for auto anti-theft  

is a safety of flight issue.  Anyone have any good ideas how to handle  

this ?



Jeff Page

Dream Aircraft Tundra #10

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nuckolls.bob(at)cox.net
Guest

Posted: Mon Jan 28, 2008 5:56 am Post subject: Z13-8 N P-Mags

At 01:06 AM 1/28/2008 -0500, you wrote:



 	  Quote: 	
		  



You might think wiring up an electronic mag might be simple 



Replacing the S700-2-10 with a S700-2-1 as I indicated in my previous

post isn't the correct solution. . . .


	




   <snip>

 	  Quote: 	
		  My current plan is to use four of the simplest single-pole on-off

switches, two for power and two for p-lead grounding, plus a push

button for start.  So that is a total of five switches, but much

simpler and cheaper components and the plane will still fly if any one

of them fails.


	


   Hmmmm . . . I take it that you have not read my response

   to your original posting on this topic. Stand the circuit

   as-published against the design goals stated and see if your

   concerns are not already addressed by the proposed two-switch

   configuration.

 	  Quote: 	
		  I like the simple flow of operating the switches.  However, I am not

completely comfortable without a keyswitch, which would be difficult

to include in this design.  I do not like keyswitches, but there is a

clear delineation between someone being (or not) permitted to start

the aircraft if they are in possession of the key.  To prevent

starting, the key would need to disconnect mag power to avoid hand

propping.  The secret switch under the dash, used for auto anti-theft

is a safety of flight issue.  Anyone have any good ideas how to handle

this ?


	


   What are the risks? How many folks of dishonorable behavior

   know how to fly YOUR airplane? Hundreds of airplanes are

   subjected to evil intent every year. Radios and instruments

   are stolen, airframes vandalized but exceedingly few airplanes

   are removed from their parking places. The most effective

   theft deterrents are the simplest. Folks who want whole airplanes

   are generally professional drug runners and the hauling ability

   of an SE lightplane is simply not in conformance with their

   business model. One of my favorite deterrents is used by several

   folks at ICT. See:



http://www.aeroelectric.com/Pictures/Misc/AC_Theft_Protection.jpg



   THIS airplane would haul a LOT of pot . . .



   The whole idea of a "secret switch" doesn't consider the

   mind-set of folks who prey upon others. If he/she goes

   to work on your airplane only to find that the "puzzle"

   is beyond their ability solve, they're more likely to

   take out their frustration with a hammer to your panel

   or a knife to your upholstery or canopy.



   Thieves are a lazy lot, else they would make their living

   by exploiting their own productiveness as opposed

   to exploiting the products of others. Hence a hardened

   steel chain and lock is very likely to send your antagonist

   off to "greener" pastures. If you make the solution to

   the puzzle quite clear from the get-go, they're more likely

   to go in search of easier prey.



   I had a hangar renter at 1K1 ask me NOT to lock his

   airplane. He had to do thousands of dollars of work

   to repair damage to doors over the years and thieves

   got his radios anyhow. He correctly deduced that it

   was a whole lot less expensive to leave the doors

   unlocked and just have to replace radios. Interestingly

   enough, after his airplane was moved to our Podunk

   International Airport (See



http://www.aeroelectric.com/Pictures/Misc/1K1_Spring_1989.jpg



   he was not victim of any more attacks against his

   airplane.



   Bob . . .

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