Today's Message Index:
----------------------
1. 05:06 AM - Sources List ()
2. 06:28 AM - Re: Recommend a digital multimeter? (Eric M. Jones)
3. 08:07 AM - Re: HiRose Circular Connectors (Robert L. Nuckolls, III)
4. 09:06 AM - Re: Re: Z-13/8 Rev. R (Robert L. Nuckolls, III)
5. 09:58 AM - Re: Z-13/8 Rev. R (Erich_Weaver@urscorp.com)
6. 12:31 PM - Re: Z-13/8 Rev. R (PaulR)
7. 10:32 PM - Z13/8 Rev Q comments (Jeff Page)
Message 1
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11/20/2010
Hello Bob, Per your request here is an additional link to add to the sources
list:
http://www.microfasteners.com/
These people have valuable fasteners for real airplanes as well (not just
model airplanes) such as 100 degree countersink, flat head, six lobe (Torx)
drive screws.
Once you use a Torx drive screw on your airplane you will NEVER again use a
phillips drive screw if it can be avoided.
'OC' Baker Says: "The best investment we can make is the time and effort to
gather and understand knowledge."
=====================================================
Time: 08:26:56 PM PST US
From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
Subject: AeroElectric-List: Sources list . . .
Just got an email from an AeroElectric-List reader
reminding me of a Sources List we generated about
a year ago that did indeed link to RTL Fasteners.
I'll invite List members to review the list at
http://aeroelectric.com/Sources.html
and let me know if there's a useful link that
needs to be added.
Bob . . .
Message 2
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| Subject: | Re: Recommend a digital multimeter? |
I have a pile of meters that await some golder moment when inspiration strikes
me to fix them.....hah.
I agree generally that cheapo meters will get the job done. My Galvanic frog-leg
is still kicking when I apply the juice, but it is really nice to have dependable
tools.
After reading this list I went to Ebay and snapped up a like-new Fluke 77 for $38
including shipping. The seller had a note "Home Use Only!" on it, which scared
away some potential buyers, but was only meant to indicate it had never seen
industrial use.
Last year when I had a very difficult 0.1% measurement, After considering all the
alternatives, I bought a freshly calibrated Fluke 87V meter (on Ebay too!)
that offered FOUR digits behind the decimal. Not cheap but 1/2 price on Ebay.
The Fluke 11 was proof that not all Fluke meters are great, but Fluke seems to
be the ticket for great products at a fair price.
--------
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones@charter.net
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=319914#319914
Message 3
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| Subject: | Re: HiRose Circular Connectors |
These connectors are gone. Thanks to all who
expressed an interest.
If you really need to have a set of these connectors
they may be acquired new-off-the-shelf at:
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=HR1741-ND
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=HR1743-ND
Bob . . .
Message 4
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| Subject: | Re: Z-13/8 Rev. R |
Bob,
Thanks for your work on this. Couple minor points and some questions.
1) Your drawing is for one Emag and one Pmag as shown in the lower right
powered from different busses, but the battery bus on the left shows L and R
ignitions powered from there.
That's an artifact from an earlier cut-n-paste. Good catch.
Fixed.
2) Again, at the battery bus, the 15amp fuse feeds a short 14AWG wire to the
relay. The relay control wire to the switch is 22AWG, and again from same
switch to ground. Shouldn't these wires also be 14AWG?
No, these wires carry relay control current only which is
perhaps 150 mA. This is not unlike the wire that controls
the battery contactor too.
3) Shouldn't the fuselink feeding the E-bus be located at the feed end (next
to the relay)?.
No, that feedpath can be powered from BOTH ends hence protection
at both ends. But you reminded me of another feature I wanted
to fix. A faulted fuse at the e-bus end is much faster and less likely
to damage the e-bus normal feedpath diode. I've revised to suggest
fuse protection at that end as opposed to fusible link.
4) For some reason, I think the relay, load shunt, capacitor, crow bar
components etc for the aux alt circuit should be located on the cockpit side
of the firewall (possibly for a cleaner more cooler environment). Is this
true?
Not a big deal. Obviously it's cooler and cleaner in the
cabin but at the same time, keeping all the high power
wires out on the firewall is probably preferred.
Further, the drawing shows the capacitor grounded at the firewall
ground bus. Is there any problem grounding it at the avionics buss instead
which is closer in my current layout?
NO! That wire carries a lot of ripple current which
is the byproduct of smoothing the SD-8 output . . . you
don't want to inject that into the avionics ground. I
think I'd keep all that alternator stuff on the forward
side of the firewall.
5) You've got 5X20 AWG wires between the firewall ground and avionics
ground busses. Is this intended to be on the same PIDG connector as shown
or 5 separate connectors?
5 separate connectors at the firewall and 5 separate
pins in the panel ground d-sub.
If it's on the same connector, why not just use a
heavier equivalent wire? Say 12AWG.
Use a 12AWG if you want to solder the wire to your
panel ground connector like shown here
http://aeroelectric.com/Pictures/Grounding/Minibus1.jpg
6) Where can I buy a low voltage module? The one shown doesn't seem to be
on the B and C website.
That's one of my devices which will be the next
product out the gate here. If you need it right
now, Eric Jones has one.
Bob . . .
Message 5
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| Subject: | Re: Z-13/8 Rev. R |
Minor comments to consider:
My local experience is that most everyone building these days, even those
on a budget, are installing engine monitors. Stand-alone low voltage
monitors are not required. Similarly, alternator load meters and their
associated shunts have been replaced by Hall effect sensors and the engine
monitor. Maybe its time to modernize the schematic to reflect this? Just
a thought...
Erich
Message 6
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| Subject: | Re: Z-13/8 Rev. R |
Bob,
I was under the impression that EMAG Air had discontinued the "E" mag and was only
making/selling the "P" mag. Just thinking that if you're revising it, maybe
worthwhile to look into that also.
--------
Paul Rose
N417PR (res)
RV-9A
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=319954#319954
Message 7
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| Subject: | Z13/8 Rev Q comments |
Bob,
I wonder why the feed paths to the Endurance Bus are different. The
relay from the battery bus is 14 awg and fused, while the diode from
the main power bus is 16 awg and not fused.
Previously, I was planning to use 14 awg and * 6 inches or less wire,
without any fuses for both paths. I have changed my drawing so both
paths include fuses.
Since Z13/8 highlights some new technology with E-Mags, perhaps it
makes sense to replace the Ford regulator with an electronic one that
includes overvoltage protection and low voltage annunication ?
Jeff Page
Dream Aircraft Tundra #10
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