REFLECTOR: dual Plasma IIIs

Fri Aug 5 11:47:24 CDT 2011

Good  for you Kurt... That's what we use on are 4 cylinder Lycoming... 2 MSD units... No problems in 5 years...

Steve 

To: reflector at tvbf.org
From: nmflyer1 at aol.com
Date: Fri, 5 Aug 2011 11:30:03 -0400
Subject: Re: REFLECTOR: dual Plasma IIIs

Well then, I don't have to worry about you riding in my 235. I have over 700 hours flying with the slicks on my O-540, and they have over 1200 hours on them. Never a problem. Don't get me wrong, I don't think they are perfect, but I have not had to do anything other than the Ad that says inspect. 

No mags at all on my V. just 2 separate MSD ignitions. 

Kurt 

-----Original Message-----

From: Patrick Sieders <pjsieders at comcast.net>

To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>

Sent: Fri, Aug 5, 2011 4:37 am

Subject: Re: REFLECTOR: dual Plasma IIIs

If you have the chance to choose, take a Bendix magneto over a slick... my 
experience with the slicks is awful and I will not even dare to put my shoes on 
an airplane powered by them. They have too many parts that seem to be made of 
plastic, wearing out, points that pit so it looks like the Alps, and coils that 
burn their wire internally and therefore at some point can’t jump the gap it 
created and dies suddenly.

Remember that this is a the heart of the engine.. without that spark no 
fire, no (controlled) explosion in the cilinder, no mechanical motion, no 
turning prop.

Patrick

From: Scott Derrick 

Sent: Friday, August 05, 2011 8:45 AM

To: Velocity Aircraft Owners and Builders list 

Subject: Re: REFLECTOR: dual Plasma IIIs

I 
don't know about 500 hours..  

Mags are known to work very reliably 
for a couple thousand hours between overhauls.  Most folks replace during 
engine overhauls.

Scott

-------- Original Message 
--------

Subject: Re: REFLECTOR: dual Plasma IIIs

From: Jones Nick mailto:nick.jones at volvo.com

To: 
Velocity Aircraft Owners and Builders list mailto:reflector at tvbf.org

Date: 
08/05/2011 06:56 AM

Let’s 
  not forget the mags need maintenance too. Slick 
  recommends 500 hour overhaul or replacement. You don’t want your mag’s performance to be marginal when you need 
  it.

Best 
  regards,

Nick 
  and Connie Jones

Velocity 
  XL-RG

N10CN

99% 
  done 90% to go

From: 
  reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] 
  On Behalf Of Scott 
  Derrick

Sent: Thursday, 
  August 04, 2011 5:20 PM

To: 
  Velocity Aircraft Owners and Builders list

Subject: Re: REFLECTOR: dual Plasma 
  IIIs

I've been running single Plasm and a Mag for 650 hours 
  total on an IO360 and IO520.  I haven't had a Plasma failure but I still 
  like two independent systems and one that will still run even if the battery 
  falls out of the airplane. 

I also didn't want the added complexity of 
  dealing with electrical failure.  Klaus says you can get 5% better 
  performance with duals vs single, but I question that number..

My Slick 
  mag may have been initially designed when  dinosaur's were still roaming 
  the earth,  but there is something to say about their proven 
  dependability.

Scott

-------- Original Message 
  --------

Subject: REFLECTOR: dual Plasma IIIs

From: Douglas Holub mailto:douglas.holub at gmail.com

To: reflector at tvbf.org

Date: 08/04/2011 03:00 
  PM

<!--[if 
  !supportLineBreakNewLine]-->

<!--[endif]-->

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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