Today's Message Index:
----------------------
1. 01:10 AM - democracy (Jerry Painter)
2. 04:08 AM - HT leads (Mark Jefferies YAK UK Ltd)
3. 07:44 AM - Re: Re: Who needs ACM?? (Roger Kemp)
4. 09:48 AM - Re: HT leads (Brian Lloyd)
5. 08:22 PM - Re: Spark Plug Conversion (Tim Gagnon)
Message 1
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--> Yak-List message posted by: "Jerry Painter" <wild.blue@verizon.net>
Democracy is indeed a messy thing. Lucky for us.
Jerry Painter
Wild Blue Aviation
Message 2
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Gents, I read with interest about this subject.
"Experimental" allows you chaps in USA to do as you like, for example -
experiment with fitting new non OEM parts or experiment to see how long "it"
lasts without preventative maintenance.
The experiment to see how long the Russian HT wire lasts seams to have a
consensus to be approx 15 years +/- . You know when its starting to fail as
you get intermittent rough running and poor starting, as the HT wire cracks
and lets the sparks out and the moisture in. On some days it does and others
it does not. Storage conditions of the a/c will affect the times.
A very cost effective fix to not overhauling the engine at the OEM calendar
times is to only fit a new HT lead set. The HT leads being used now will
most likely last longer than Russian materials. The plugs are certainly
cheaper.
While your at it don't forget to change the HT lead for the booster coil,
this is the most critical part to aid starting. Very few mags have
sufficient energy to start the engine at the speeds of air propping a cold
engine.
Engine reliability is a "J" curve against calendar/TTSN vs. failure. 750 hrs
on new engine and 500 on overhauled. But we all know they go to 1000hrs but
with the odd valve blowing or compressor change etc.
Its my opinion that Dennis very good HT fix using local parts is no better
or worse than an engine that's had a proper OEM overhaul fitted with new
plugs, wires and OH mags. Either will fix the problems equally as well as
each other.
So why go "local" when, Plugs available new - Chinese have never blown in my
experience yet in M14P. Termikas advise that new Russian plugs do fail under
pressure test. They have not found a Chinese one do so yet out of 500
tested.
Packard or any other aviation HT wire available new
Mags we hope to have new coils made very soon.
Mag caps and rotors , same as on Housie engine - available.
That leaves points, simple fix is to have the existing springs re tipped.
I think that takes care of HT problems.
Take care.
mj
Message 3
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| Subject: | Re: Who needs ACM?? |
--> Yak-List message posted by: "Roger Kemp" <viperdoc@mindspring.com>
Barry,
Figured you could get away with Roman candles for Triple A and Morters (
the colorfull airburst types) for higher levels. Got to be careful with
that pesky FAA ruling now a federal law about firing things at civilian
aircraft flying overhead. Lasers are a definate no no. High beam
flashlights will get you 5 to 10. Just ask this bozo that lived off the end
of 10 at MGM. Seems he did not like our Vipers turning base to final over
his delapedated tin barn and farmhouse. So he would repeatedly shine a high
beam search light up at us when were night flying. Along with making
multiple complaints about out jet noise! The final straw came when he
combined a laser (the type you can get in a hardware store) with Roman
candles one night! That got him a visit from the FBI and a court date. He
is now in the federal pin entertaining Bubba!
Just be careful with shining or shooting things at civilian aircraft and
yes we are civilian aircraft. Even if we are all consenting adults in these
exercises. The rule applies for both military and civilian aircraft in
peacetime. The punishment may not neccessarily fit the crime in this case
but the law is on the books and they will apply it with impunity if caught.
I know you still have wide open spaces out there. We are not so lucky down
here in LA. There are questioning eyeballs everwhere. Some of these Red
necks still are trying to figure out why there is a Red Star painted on
some of these aircraft!
Doc
Doc
> [Original Message]
> From: barry <barry@flyredstar.org>
> To: <yak-list@matronics.com>
> Date: 3/26/2006 12:18:12 AM
> Subject: Yak-List: Re: Who needs ACM??
>
> --> Yak-List message posted by: "barry" <barry@flyredstar.org>
>
> Blitz,
>
> I hesitate to agree that your idea was dumb to leave early, but yes, you
missed a whale of a great time and a very cool exercise. We will have more
"troops in contact/calls for fire" in the fall event....very reminiscent of
current day operations v. Al Queda in Afghansitan. You willl be shot at
(signal mirrors simulating AAA, model rockets simulating should fired
SAM's, etc.), harrassed (those pesky fanatics have found a few civil air
assets and armed them with rear quarter missles!), and motivated to execute
properly (all "dead" aircraft are required to fly a straight in approach on
recovery....very humiliating! ;) ).
>
> November date has not been set, but we're working on it!
>
> Cheers,
>
> Barry
>
> Desert Thunder III Staff Coordinator ;)
>
> --------
> Barry Hancock
> Worldwide Warbirds, Inc.
> www.worldwidewarbirds.com
> www.cj6.com
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=24317#24317
>
>
>
>
>
>
>
Message 4
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--> Yak-List message posted by: Brian Lloyd <brian-yak@lloyd.com>
Mark Jefferies YAK UK Ltd wrote:
> Gents, I read with interest about this subject.
>
>
>
> Experimental allows you chaps in USA to do as you like, for example
> experiment with fitting new non OEM parts or experiment to see how long
> it lasts without preventative maintenance.
Mark, I beg to differ. The purpose of the new and different HT wiring is
not to see how long things last but to actually improve the system from
both a reliability and maintainability point of view. Dennis' HT wiring
system using modern automotive materials is likely to last longer and
give less trouble than will the stock Russian HT wiring system.
Modern resistor wires are extremely reliable and eliminate the need for
shielding. Eliminating the shielding also reduces the capacitance of the
wire thus allowing for a faster rise-time of the voltage. This improves
spark timing and spark voltage as less of the energy goes into charging
the center-conductor-to-shield capacitor. You can get away with a larger
gap and get more reliable firing of the cylinder.
This is not a "hack" or a "band aid" but an actual systems improvement.
In this it is like installing a modern alternator in place of the old
Russian generator. It will last longer and exhibit fewer failures than
will the older Russian systems.
> While your at it dont forget to change the HT lead for the booster
> coil, this is the most critical part to aid starting. Very few mags have
> sufficient energy to start the engine at the speeds of air propping a
> cold engine.
And I would much rather see someone adapt something like the Slick-start
"shower of sparks" module to the Chinese centrifugal-advance mags (it
should be a bolt-on modification) and eliminate the booster coil all
together. (You can't do it with the Russian mags as they have fixed
timing.) The whole boost-coil starting system is a bad hack with the
distributor providing spark timing during start. This is just butt-ugly
bad engineering. Sure it works but it is amazing just how many bad
things work.
> Engine reliability is a J curve against calendar/TTSN vs. failure. 750
> hrs on new engine and 500 on overhauled. But we all know they go to
> 1000hrs but with the odd valve blowing or compressor change etc.
Perhaps. On the other hand, our lubricants are superior to what the
Russians were using when they determined wear rates and therefore
overhaul intervals. Modern US oils combined with good oil filtration
should reduce wear in the engine by a significant margin. This should
result in an increase in TBO. It would be good if people did this to
their engines and then measured wear patterns against time-in-service at
overhaul time. That would allow us to determine what the real TBO
intervals should be. If we could increase the length of the bottom of
the "J" curve (we call it the "bathtub" curve over here as it looks more
like the contour of a bathtub) then we can safely increase the
recommended TBO without increasing the risk of systems failure.
> Its my opinion that Dennis very good HT fix using local parts is no
> better or worse than an engine thats had a proper OEM overhaul fitted
> with new plugs, wires and OH mags. Either will fix the problems equally
> as well as each other.
IMHO it is substantially better than the stock system. With some
measurements on both the primary and secondary sides of mag; e.g. peak
voltage, rise time, spark energy, etc.; it should be pretty easy to
prove too.
> So why go local when, Plugs available new - Chinese have never blown
> in my experience yet in M14P. Termikas advise that new Russian plugs do
> fail under pressure test. They have not found a Chinese one do so yet
> out of 500 tested.
It might also be interesting to see what the voltage breakdown
characteristics are as well. We might be surprised.
Yes, the "experimental" category can be abused but it is quite useful if
used properly. We can use it to learn how to do things better. If you
doubt that, go to Oshkosh and look at the difference between the
experimental homebuilts and the production aircraft. Innovation in
aviation is almost the exclusive to the domain of the experimental aircraft.
--
Brian Lloyd 361 Catterline Way
brian-yak at lloyd dot com Folsom, CA 95630
+1.916.367.2131 (voice) +1.270.912.0788 (fax)
I fly because it releases my mind from the tyranny of petty things . . .
- Antoine de Saint-Exupery
Message 5
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| Subject: | Re: Spark Plug Conversion |
--> Yak-List message posted by: "Tim Gagnon" <NiftyYak50@msn.com>
Its on (but not wired into the mag yet) and no busted knuckles but there were a
few foul words. Mostly self induced issues but you learn quickly not to make
the same mistake twice.
Nice setup and easy to do. We had less than five hours in the installation with
a stop for lunch and a little Yak airshow!!
Thanks to Jay Hodge and Kurt (our A&P and IA) for the help! Actually I think I
was helping them....
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=24491#24491
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