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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