REFLECTOR: Progress

[Jack Prock]

HI,

I have an older Jeff Rose EI. I didn’t buy it directly, it came with the engine that I bought. 

I hadn’t thought about it, but this ignition may use the same open/closed ground switching that a mag
uses so that I could still use the keyed switch. I will have to do more research on that. 

Jack

From: Geoff Gerhardt 
Sent: Friday, May 18, 2012 4:21 AM
To: Velocity Aircraft Owners and Builders list 
Subject: Re: REFLECTOR: Progress

Jack, 

What sort of EI are you using?  A LightSpeed EI offers a "p-lead" like disable where grounding of this lead will disable the ignition.  When I took over my project, it came with an older Lightspeed ignition box.  I took a look at the wiring schematics on Klaus' website and saw that this option was available and assumed it was enabled on my box.  I wired my ignition system such that I used this to control my box.  But, when I started my engine, I found that it didn't work (ignition as on regardless of the p-lead grounding switch position).  After talking to Klaus at LS, I found that this "p-lead disable" was an option and had to send my box back to Klaus to get it installed.

I use two switches, one for my mag, one for the EI, but if you had a LS box with this option installed, you could use a regular keyed ignition switch.

Geoff


On Fri, May 18, 2012 at 12:33 AM, Jack Prock <jackprock at wavecable.com> wrote:

  Hi,

  I am working on the final design of my electrical system and was wondering if anyone has used a standard 
  keyed ignition (OFF-Left-Right-BOTH) when set up with one mag and one electronic ignition system?

  Up until today, I was thinking that I could use a standard aircraft keyed switch, but I didn’t realize that the mag is shut off by
  grounding out one of the leads. This means that when the keyed switch is in the off position, the two terminals and the center
  post are actually connected. And when in the BOTH position, the two terminals and the center post are not connected. 

  I can think of a way to use the keyed switch... but the motion of the key turns from right to left, not left to right. I would just need
  to create a new label and use a relay for the Mag connection. This would have the added benefit of not having the mag wire
  anywhere near the radios to cut down on e-noise. I just don’t like the opposite key rotation.


  Are people with electronic ignitions using a two simple switches?  1) Elec-IGN   2) MAG   
  Do you have a key/lockset at all?

  Any input would be helpful.

  Thanks,

  Jack

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