Today's Message Index:
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1. 12:18 PM - Peer review, Z16 Rotax engine, Ducati Regulator (velletazjp)
2. 01:36 PM - Re: Peer review, Z16 Rotax engine, Ducati Regulator (Robert L. Nuckolls, III)
3. 06:56 PM - Re: Peer review, Z16 Rotax engine, Ducati Regulator (user9253)
4. 08:17 PM - Breaker then pump failure (David Saylor)
5. 08:20 PM - Engine Monitor P-lead question (farmrjohn)
Message 1
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| Subject: | Peer review, Z16 Rotax engine, Ducati Regulator |
Hi everybody
Many thanks for all the help I received when I designed the electric system for
my Jodel's friend.
The plane is now airworthy and so far everything is working like a charm.
I now start helping an other fellow aviator who'w building an Aero101. He is a
professional carpenter and the airplane is a true beauty but electicity is not
he's strong skill.
I designed a very simple electric system, 90% inspired by bob's Z16.
Once again Bob [and all the other members of this forum], thanks for all the knowledge
you're spreading...
My friend had 2 requirement that forced me to differ from Bob's design :
- he doesn't want to use a battery relay (I personally don't neither the load
on the bus is less than 5Amp and a simple switch can handle that kind of current)
- he bought a rather expensive start key (see installation manual attached) that
permits to turn ON the battery, select Ignition 1 and/or 2, and activate the
stater. He don't want any other switches (unless safety mandates).
Initially, the supplier doesn't advised to install a OV disconnect relay, but I
used Bob's design to adapt one on his airplane.
Please let me know if you see any flaws or improvement possible.
Many thanks
--------
2020 contribution paid
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=498689#498689
Attachments:
http://forums.matronics.com//files/loraviacom_regulateur_912_ducati_395.pdf
http://forums.matronics.com//files/schema_electrique_objet_176.pdf
http://forums.matronics.com//files/120883263_336407514294840_7206115166821084811_n_649.jpg
Message 2
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| Subject: | Re: Peer review, Z16 Rotax engine, Ducati Regulator |
>
>Initially, the supplier doesn't advised to install a OV disconnect
>relay, but I used Bob's design to adapt one on his airplane.
>
>
>Please let me know if you see any flaws or improvement possible.
The crowbar ov module wires ACROSS the
alternator disconnect relay DOWNSTREAM
of the 5A breaker. See figure Z16.
Bob . . .
Message 3
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| Subject: | Re: Peer review, Z16 Rotax engine, Ducati Regulator |
The crowbar module will short out the battery.
There is a long, always-hot wire connected between the battery and
terminal 1 of that expensive switch. In an accident, that wire could make
sparks and start a fire. A battery contactor can shut off power close to the battery.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=498692#498692
Message 4
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| Subject: | Breaker then pump failure |
I just had the Tyco switch/breaker for my boost pump fail. It made a bad
smell, then became intermittent, then failed completely in the span of a
few minutes. I replaced it with the same make and model.
2.5 flight hours later my boost pump failed. The new breaker never
tripped. The pump just stopped running. The pump circuit has no
resistance and I get full bus voltage at the pump, even with the pump still
connected. So it's open inside. The new switch is working fine.
The pump is from Airflow Performance. They're common in RVs. The pump and
the switch had almost 2000 airframe hours since installed. I use it for
take-off and landing, so the powered time is a fraction of the total time.
The airplane had been sitting for almost a year, then flown about 15 hours
in the last two weeks.
Does anyone have an understanding of any relationship between these two
failures? They seem too similar to be completely unrelated. My guess is
that a faulty pump somehow overloaded a faulty breaker, then failed
completely. I couldn't say that I noticed any particular fuel pressure
issues before the failure. Everything was in the green.
Thoughts?
Message 5
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| Subject: | Engine Monitor P-lead question |
I'm installing an Electronics International CGR-30P engine monitor. For the tach
function they have two leads that connect to the left and right P-lead on the
ignition switch which are not shielded. The P-leads from the mags to the switch
are shielded. Will this be an issue? Can those two leads be included in
a wire bundle or should they have their on run away from other wires? Thanks,
John
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=498693#498693
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