REFLECTOR: dual Plasma IIIs

Scott Baker scottb33333 at gmail.com
Thu Aug 4 18:18:26 CDT 2011


Doug
Good decision. 
I spoke with a fellow Velocity owner at Osh with two Lightspeeds, and he too is considering dropping one in favor of either a mag or possibly an electronic ign from Electro Aire. I personally think the mag option (with one electronic ign) is best. 

Scott Baker
Sent via iPhone

On Aug 4, 2011, at 2:00 PM, "Douglas Holub" <douglas.holub at gmail.com> wrote:

> One of my Plasma III boxes failed while flying to Tennessee from Texas last summer. After a post-mortem, Klaus couldn't explain why it failed. The box was the same one that was DOA when it was new, and was then subsequently repaired by Klaus. At that time he said he found a loose wire in the box, so I suspect that the flopping wire did some undetectable damage which eventually caused the box to fail while we were flying.
>  
> So today I'm replacing that electronic ignition with a Slick magneto, and I am amazed how much complexity it removes from my wiring. With only one electronic ignition I don't need: 1. The auxilliary back-up battery, 2. The auxilliary back-up battery charging circuit, 3. The circuit that detects and indicates the fault condition that causes the auxilliary battery to provide power (so I know when the back-up battery is being used), 4. The circuit that lets you know when one Plasma III is working while the other one isn't.
>  
> The reason you need #4 is because the ignitions are so good, there is often no perceptible RPM drop when one of them fails. And that's why I wish I had used one Plasma III and one magneto from the beginning. I thought I would get better performance with two Plasma IIIs, but if there is no RPM drop, I don't think the second one is helping much.
>  
> I my engine has 14mm spark plug holes on top and bottom, so that's a little problem switching to a magneto wiring harness. But I found some shielded automotive spark plug adapters from Great Plains, the VW conversion people.
>  
> Doug Holub
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