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dennis.glaeser(at)eds.com
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 Posted: Mon May 12, 2008 7:49 am Post subject: Z-19 Item Clarification |
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The "requirement" I spoke of came about from an off-field incident in
March which Eggenfellner said that they will not support bridge
rectifiers being used for their engines.
Scott R. Shook RV-7A (Building) N696JS (Reserved)
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The cause of that incident has not been determined. Jan's assessment
that it was 'the diodes' is his pure unfounded speculation, and totally
wrong IMHO and experience. They were high capacity (45V 60A) diodes -
NOT a bridge rectifier (which I agree would be inadequate for this
application).
I am using diodes (50HQ035) in my Egg H6 ignition circuit without any
problems (all 14.5 hours so far  My electrical design (similar to
Z-19) can be viewed at:
http://www.wideopenwest.com/~glaesers/electrical_plan.htm
I have a temp sensor on the highest amp (EFI) diode on the main ignition
circuit and the highest temp it has seen is 103F (it's rated to 350F).
My design was complete, and my airplane wired well before the current H6
installation manual was published. When Jan decided to get away from
using the EXPBUS, he was looking for alternative designs, so I sent him
mine, but obviously it wasn't adopted.
Jan does not support using diodes, and that's OK with me. There is
nothing 'wrong' with their design, and the 4PDT switch they specify is a
high quality switch. I just prefer multiple redundant (and much cheaper)
switches. My design could be implemented without the diodes and would
work just fine, but would not be as 'operator error proof' under certain
(albeit highly unlikely) failure modes.
Dennis Glaeser
RV-7A Egg-H6 - flying - Phase 1
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trigo(at)mail.telepac.pt
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| Posted: Mon May 12, 2008 8:36 am Post subject: Z-19 Item Clarification |
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It's not my intention to bring to this Electric forum a subject which is
more related with engines, but I must say that, to my knowledge:
- the cause of that particular accident was not yet determined, and most
probably never will, since the fire developed on the retrieval procedure
destroyed almost everything
- in the preliminary accident report you cited, there is not a single word
about a possible cause, and obviously there is not a reference whatsoever to
a switch or a diode
- the pilot told me he is not re-building, and never mentioned to have
become a Lycoming customer, even less "favourite"
- you seem to blame the pilot for turning left after the failure, but the
failure only happened after he turned left
You are free to criticize the pilot, even bash the Eggenfellner factory, or
glorify Lycoming, but you have to be more careful with what you say or write
Carlos
no, I don't have any proxy from Allan or Eggenfellner to defend them
DO NOT ARCHIVE
[quote] --
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longg(at)pjm.com
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| Posted: Mon May 12, 2008 10:10 am Post subject: Z-19 Item Clarification |
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1. the cause will never be determined. The guy who picked up the plane
with a bucket loader started a fire which basically destroyed it.
2. yes, the only testimony is from the pilot and what he believes could
have happened. Not definite.
3. I did not blame the pilot for turning left, I just mentioned a
smoother e-landing would have occurred if he had turned right.
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msausen
Joined: 25 Oct 2007
Posts: 559
Location: Appleton, WI USA
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| Posted: Mon May 12, 2008 11:23 am Post subject: Z-19 Item Clarification |
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Hey Carlos, you going to be at the Eggenfeller booth again this year at OSH?
Do not archive
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