REFLECTOR: Progress

John Dibble aminetech at bluefrog.com
Fri May 18 10:41:40 CDT 2012


The mag is working even when it's switched off, so I don't think 
switching off will extend the life.

John

On 5/18/2012 8:19 AM, Douglas Holub wrote:
> My mag is fixed at 25 degrees btdc so it would be bad to use it during 
> starting. I have a red push button for the starter solenoid in series 
> with a DPDT toggle switch. When the toggle switch is ON it connects 
> the push button to the starter solenoid and shorts the mag's P-lead to 
> ground. That way the mag will never be firing while the starter is 
> cranking.
> I never wanted to use a magneto because they are notoriously 
> unreliable after a few hundred hours, but one of my Plasma III boxes 
> failed during a cross country flight once so now I'm a little nervous 
> about putting all my eggs in Plasma III's basket. The engine starts 
> and runs great with just one Plasma III.
> Why don't I climb to altitude with both ignitions and then turn the 
> magneto off while I'm cruising to extend the life of the magneto and 
> increase the chances that it will be working well when I need it?  I 
> would turn the magneto on during my descent and then when I had the 
> runway, turn off the Plasma III so the engine would idle slower on the 
> one mag. Would this be considered risky? Does anybody do this?
> Doug Holub
> Standard FG
>
>     ----- Original Message -----
>     *From:* Jack Prock <mailto:jackprock at wavecable.com>
>     *To:* Velocity Aircraft Owners and Builders list
>     <mailto:reflector at tvbf.org>
>     *Sent:* Friday, May 18, 2012 12:33 AM
>     *Subject:* Re: REFLECTOR: Progress
>
>     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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