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Date: Fri, 15 Jun 2007 13:24:09 -0400
From: Ernest Christley <echristley@nc.rr.com>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: I've been prayed out of Rotary Purgatory
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Lehanover@aol.com wrote:
> In a message dated 6/15/2007 9:35:51 A.M. Eastern Daylight Time, 
> echristley@nc.rr.com writes:
>
>     One EDIS would be set to control the leading
>     plugs with a wasted spark, and the second would control the
>     trailing. 
>     It promises to be a very robust setup with multiple redundancies.
>
> Don't forget that the trailing sparks must be distributed. Never fired 
> at the same time.
>  
> Because there will be an apex seal between the two spark plugs, and 
> destroy the engine.
>  
> Leading plugs in the lost spark situation, is no problem.
>  
> Lynn E. Hanover
>

That's why two EDIS ignitions are needed...running from separate vr 
sensors.  The trailings sensor can even be offset by 5 or 6 degrees to 
give the trailing spark delay.