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Brian, I've been flying with the Magnecor ignition wires
for almost 10 years. They will make a set to your specified links and
color plug covers (I use different colors for Lead and trail plugs) for a
reasonable price (well, it was around $50 ten years ago).
Ed
Sent: Saturday, July 09, 2011 8:53 PM
Subject: [FlyRotary] Re: sheilded plug wires
After reading the literature from magnecor, I think I'll just go with their
EMI suppressing leads, which I recieved in the mail yesterday. I just borrowed a
smaller prop so I can achieve the higher RPMs on the ground, now to go ahead and
start doing some testing on the ground. Everything else about the plane seems
satisfactory- it flies and handles well on the ground and in the air, the engine
cools well, I just need to figure out this misfiring thing before Igo up
again.
Brian Trubee
-----Original
Message----- From: Tracy <rwstracy@gmail.com> To: Rotary motors in
aircraft <flyrotary@lancaironline.net> Sent: Sat, Jul 9, 2011 12:03
pm Subject: [FlyRotary] Re: sheilded plug wires
I tried shielding
solid wire ignition leads on my first engine back in 1994. It caused the
old 2nd gen coils to malfunction and miss badly for some reason.
Didn't try it on other coils. The spiral wound wires are the way to go
IMO. Never had a problem with ignition or radio noise since using
them. Tracy
On Sat, Jul 9, 2011 at 12:56 PM, Kelly Troyer <keltro@att.net>
wrote:
Brian
Apparently the shield you are proposeing is not a good
Idea..........The reason why is noted in the
"Magnacor" link in my previous
post................
Kelly Troyer
"DYKE DELTA JD2" (Eventually)
"13B ROTARY"_ Engine
"RWS"_RD1C/EC2/EM2
"MISTRAL"_Backplate/Oil
Manifold
"TURBONETICS"_TO4E50 Turbo
From: "bktrub@aol.com" <bktrub@aol.com>
Sent: Saturday, July 9, 2011 11:51 AM
Subject:
[FlyRotary] Re: sheilded plug wires
Ok, theory is nice,
I prefer to just think it is all magic. My apologies, but I am the
product of our public school system : )
What I'd like to know is
this- am I fabricating the wires correctly? I cut the insulation about
1/2 inch back from the inner conductor, and then crimp the terminal so that
the conductor is folded back against the wire under the terminal
crimp.
There is no outer braid or anything which actually grounds against the
engine. I am thinking of putting an outer braid around the wires and then
grounding that on one end.
Brian Trubee
-----Original
Message----- From: Charlie England < ceengland@bellsouth.net> To:
Rotary motors in aircraft < flyrotary@lancaironline.net> Sent:
Sat, Jul 9, 2011 9:11 am Subject: [FlyRotary] Re: sheilded plug
wires
To expand on that for the electron-challenged, an inductor is effectively
a frequency dependent resistor. The higher the frequency, the higher the
resistance. So, the fundamental pulse to the plug makes it through (though
slowed slightly), while the harmonics (noise) that were generated can't
get past the extra resistance presented to them. The reverse is true
for a capacitor. That's one of the reasons why you see capacitors with one leg
tied to the power supply & the other to ground. The capacitor blocks DC
but passes higher frequencies (the noise) to ground. I have no doubt
that the above will make physicists cringe, but it's close enough to working
knowledge for us builders to use. Charlie On 07/09/2011 08:28
AM, Tracy wrote:
In this case "shielded" is the wrong term. The spiral wire does
not actually shield the noise, it prevents the noise from being transmitted.
It acts as an inductor to prevent the propagation of the noise
generated at the spark gap from propagating up the wire.
Tracy
Sent from my iPad
It has to do with the resistance of the long thin Monel wire. An
impedance mismatch and inductive reactance. What the mechanism is I do not
know. That is why Tracy is here, to explain such matters.
Lynn E. Hanover
In a message dated 7/8/2011 11:08:09 P.M. Paraguay Standard Time, SBoese@uwyo.edu
writes:
My last massage got a little garbled, the way I have my wires
configured now, the conductor and spiral wrap are exposed and folded
under the crimped teminal ends, so aren't both the conductor and the
spiral wrap acting as a conductor? What is doing the shielding?
Brian
Trubee
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