Today's Message Index:
----------------------
1. 07:23 AM - Re: Z-19 hypothetical question ()
2. 08:37 AM - Re: Question about wire sizes (RALPH HOOVER)
3. 01:12 PM - Re: Off Topic? Scratch build your own autopilot (Robert L. Nuckolls, III)
4. 03:16 PM - AEC9011 OV/LV-Warning (Robert L. Nuckolls, III)
5. 05:32 PM - Re: Re: Z-19 hypothetical question (Robert L. Nuckolls, III)
6. 09:06 PM - Harbor Freight 93258 charger evaluation (Robert L. Nuckolls, III)
Message 1
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Subject: | Z-19 hypothetical question |
Bob,
Let me know if you need another mule to test the below. I am very
interested (no, make that a must have) in dual battery monitoring. A
quick google turns up a few options.
High tech job.
http://store.solar-electric.com/xalidubamo.html
Gizmo.
http://www.piranhaoffroad.com.au/products/dualbattery/dualbatteryinfo_ac
cessories.htm
Do not archive.
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of
Robert L. Nuckolls, III
Sent: Saturday, May 24, 2008 2:22 PM
Subject: Re: AeroElectric-List: Z-19 hypothetical question
--> <nuckolls.bob@cox.net>
P.S. A product under development . . .
http://www.aeroelectric.com/Catalog/AEC/9011/9011-700-1C.pdf
has two channels of LOW Voltage warning. The second specifically
intended to watch the aux battery for failure of contactor or failure of
pilot to close said contactor.
I don't think I'd put a low voltage warning in just for that purpose but
in this case, it was about a 7% increase in parts count to add the
feature to an existing design.
Just some additional food for thought.
Bob . . .
Message 2
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Subject: | Question about wire sizes |
Les,
The 14-18 is in fact a range. You could use 14-18 on 18 ga or
16-18 on 18 ga wire. Amp has too many combinations to count but with a
little digging you can find a combination of parts that will do what you
need. I have attached a link to contact info and a couple of PDF's that may
help. Pages 398 to 405 of the current digikey catalog may help as well.
http://catalog.tycoelectronics.com/TE/bin/TE.Connect?C=1
<http://catalog.tycoelectronics.com/TE/bin/TE.Connect?C=1&M=BYPN&TCPN=66360-
1&RQPN=66360-1> &M=BYPN&TCPN=66360-1&RQPN=66360-1
http://ecommas.tycoelectronics.com/commerce/DocumentDelivery/DDEController?A
ction=showdoc&DocId=Catalog+Page%7F65910_0806_PrecisionPinSockCntcts%7Fn%2Fa
%7Fpdf%7FEnglish%7FENG_CAT_65910_0806_PrecisionPinSockCntcts_.pdf
Ralph
_____
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Les
Kearney
Sent: Tuesday, May 27, 2008 12:22 AM
Subject: RE: AeroElectric-List: Question about wire sizes
Dale
To clarify, why couldn't I use the 14-18ga pins for the 18ga wire? Do the
pins fit a specific gauge or a range of gauges? If not a range, then what
does 14-18ga mean versus 16-18ga?
Thanks
Les
_____
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Dale
Ensing
Sent: May-26-08 8:19 PM
Subject: Re: AeroElectric-List: Question about wire sizes
Les,
The nomenclature pertains to the wire gauge to be used with the various pins
not the pins themselves. If is says it is 16-18ga., then that is the wire
size to be used with that pin. In your case you would use pins marked for
16-18ga.for your 18ga. wire.
If you look at the pins you will see that the pins for the larger wire
gauges (wires with smaller numbers) have a larger hole in which the wire is
inserted and crimped than pins marked for smaller sizes (wires with larger
numbers). This is to assure that you get the proper air tight crimp on the
wire. You will discover that is almost impossible to get a good crimp on a
small wire if you use a pin marked for a larger size wire.
Dale Ensing
----- Original Message -----
From: Les Kearney <mailto:kearney@shaw.ca>
Sent: Monday, May 26, 2008 9:39 PM
Subject: AeroElectric-List: Question about wire sizes
Hi
I am trying to get smart about wiring in my a/c. II understand wire gauge
sizes but am a bit confused about the wire gauge references on connectors.
For example, AMP CPC connectors can take various pin sizes - 24-26ga,
20-24ga, 14-18ga and 16-18ga. Can someone explain the differences between
each pin size? If I was using 18ga wire, which pin size would be
appropriate?
Inquiring minds need to know..
Les Kearney
_____
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Sam
Hoskins
Sent: May-26-08 4:40 PM
Subject: AeroElectric-List: Off Topic? Scratch build your own autopilot
FYI - I have a very unusual auction going on Ebay for a scratch-build
autopilot, and a story that goes with it. Here's the auction link:
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem
<http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=190225235720>
&item=190225235720
If that doesn't work just plug 190225235720 into the Ebay search box.
Sorry for the shameless plug.
Sam Hoskins
Murphysboro, IL
http://www.matronics.com/contribution
href="http://www.matronics.com/Navigator?AeroElectric-List">http://www.matro
nics.com/Navigator?AeroElectric-List
href="http://forums.matronics.com">http://forums.matronics.com
href="http://www.matronics.com/contribution">http://www.matronics.com/c
http://www.matronics.com/contribution
Message 3
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Subject: | Re: Off Topic? Scratch build your own autopilot |
At 06:03 PM 5/26/2008 -0500, you wrote:
><ceengland@bellsouth.net>
>
>Sam Hoskins wrote:
>>FYI - I have a very unusual auction going on Ebay for a scratch-build
>>autopilot, and a story that goes with it. Here's the auction link:
>>http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=190225235720
>><http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=190225235720>
>>
>>If that doesn't work just plug 190225235720 into the Ebay search box.
>>
>>Sorry for the shameless plug.
>>
>>Sam Hoskins
>>Murphysboro, IL
>
>Hey Sam,
>I actually have one those that came out of a T-18 (wrecked in a storm) and
>there's another in a homebuilt of pre-WW-II Philippine origin here on my
>home field.
>
>Unfortunately, I can't find the docs for it. How much to scan & email the
>docs?
I think I have a set of the plans. They were offered in a
series of articles in Sport Aviation. If I get time
I'll scan them and post to the website.
Actually, these have more historical value than practical.
Nowadays, one might use a piezo rotational-rate sensor
as opposed to building the fluid-jet device that Doug concocted.
But the fluid-jet rate sensor has a certain elegance of
thought behind it that I find fascinating.
Further, while Doug offered a means by which one could craft
a DIY flux-gate magnetometer to derive magnetic heading,
I think I would opt for getting true or magnetic course off
a GPS engine.
Having said all that, it's interesting to peer into the
mind of Doug Garner. I had the pleasure of conversation with
him over several years attendance at OSH. He possessed one
of those rare intellects that could sift through piles of
simple-ideas and past recipes for success to come up with
new and better ways to do it . . . or techniques that can
be accomplished in a hobbyist's electronics shop.
A true teacher.
I just found the folder where I'd stored Doug's work
and discovered that it also contains a data
package by a Mr. Don Hewes who also did a manual on
home built a/p systems. Don references Doug's work
and offers some interesting variations on a theme tailored
to tools, materials and techniques available to us about
1980 when this work was getting started.
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
Message 4
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Subject: | AEC9011 OV/LV-Warning |
At 10:16 AM 5/27/2008 -0400, you wrote:
>
>Bob,
>Let me know if you need another mule to test the below. I am very
>interested (no, make that a must have) in dual battery monitoring. A
>quick google turns up a few options.
I do have one system installed on a YAK . . . I presume
the outcome was satisfactory. No negative feedback and
numerous inquiries from other interested customers. I think
we're ready to rock-n-roll pending allocation of $time$
toward that task.
>High tech job.
>http://store.solar-electric.com/xalidubamo.html
>
>Gizmo.
>http://www.piranhaoffroad.com.au/products/dualbattery/dualbatteryinfo_ac
>cessories.htm
Hmmm . . . pricey little buggers . . .
The 9011 is designed first to be OV protection for generators
but adaptable to alternators. Second, LV warning for the
main bus and third, LV warning for an aux battery. All three
functions in one box for about $50. One may pick any combination
of the three functions to operate independently of each other.
I just got home from Medicine Lodge, KS. Had a meeting with
my family's banker and CPA about setting up an LLC under which
I plan to operate the AeroElectric Connection publications,
a line of products for OBAM aircraft (business name to be
determined), my son's locksmith activities along with his
HVAC services, my consulting services, and a sort of
"how can we help you" handy-man service backed up with
a great wood working shop. The kids are going down tonight
to tour some available house with a real estate agent.
We're 99% sure that the whole family will be moved to
ML before the end of the year, 95% sure before the end
of the summer.
Once I have a mechanism in place to hire help and take
care of government's penchant for ham-fisted-filching
of citizen's property, I'll get the 9011 and a number
of new products into production with a goal of turning
all but consulting business over to the kids.
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
Message 5
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Subject: | Re: Z-19 hypothetical question |
At 08:31 AM 5/26/2008 -0700, you wrote:
>
>Hey Bob, were you referring to me as joe-pilot? LOL
>
>Ok, to keep me from stubbing my toe, how about the attached schematic? It
>features circuit breakers within reach of the pilot, dual alternate feed
>for the essential bus, relays to isolate power from the cockpit, one power
>wire between engine compartment and essential bus with fusible links to
>protect it.
>
>Any suggestions, comments, or improvements are welcome.
>
>Joe Gores
I'm having trouble putting my arms around the rationale
for the double alternate e-bus feeds. The original design
goal for dual batteries under Z-19 was to make sure the
LAST piece of equipment on board to loose power after
alternator failure was the engine.
Further, with the double-alternate feed scheme you seem
to be worrying about double failure . . . alternator
followed by a failure of your non-engine battery to carry
e-bus loads.
For the first 25% or so of capacitor discharge, voltage
falls at the approximate rate of:
Volts/Second = Amps/Farad
Assuming a 4A bus, then 4A/.05F yields a rate of
80 volts/second. If your hoping to keep the e-bus
at say 10v or above, then starting with a fresh battery
(12.5 v) you can tolerate a drop of 2.5 volts during
transition.
At 80 volts/second decay, you can tolerate an open supply
line for 2.5/80.0 or 32 milliseconds. Hmmm . . . you
can probably get the transition over with in that time.
But suppose you're switching from a discharged battery
at 10.5 volts. Now the capacitor starts at 10.5 and
transition has to be completed in 0.5v/80vps
or 6 milliseconds.
This exercise illustrates why we don't attempt these
kinds of things in the big iron birds. Every piece
of equipment we install is qualified to make graceful
recoveries from total loss of power during switch
or relay transitions.
Let's revisit Z-19 as published and you tell us
what failure mode is not addressed.
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
Message 6
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Subject: | Harbor Freight 93258 charger evaluation |
Got over to HF late last week and picked up a couple
of the latest and cheapest chargers. The first one I
had a chance to evaluate was the 93258, 1.5 "on board"
charger.
Here's the recharge profile I recorded . . .
http://aeroelectric.com/Pictures/Battery_Chargers/HF_Chargers/HF93258_1.jpg
This is a bit of a pig for 1.5A charger. Probably wouldn't
want to mount it on your airplane. However, it is nicely
built and would probably be just fine for wheel or water-
borne vehicles.
It's NOT a battery maintainer. No top-off dwell. Further,
it oscillates between about 13.0 volts and 14.0 volts with
relatively short busts of input energy necessary to push
the battery terminal voltage back up to 14.0 volts.
An excellent buy at $13.00 but not the best we know how
to do with maintainers.
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
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