Today's Message Index:
----------------------
1. 10:37 AM - Odyssey PC680 Battery load tests (Mickey Coggins)
2. 12:58 PM - Re: Odyssey PC680 Battery load tests (Werner Schneider)
3. 03:47 PM - Re: Re: Transponder antenna signal (John Morgensen)
4. 03:54 PM - Re: Odyssey PC680 Battery load tests (Robert L. Nuckolls, III)
5. 06:18 PM - Robust transponder antennas (Robert L. Nuckolls, III)
6. 06:36 PM - Buss Bar (John Grosse)
7. 07:06 PM - Re: Buss Bar (Robert L. Nuckolls, III)
8. 08:13 PM - World's Fastest (Speedy11@aol.com)
Message 1
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Subject: | Odyssey PC680 Battery load tests |
Hi,
I used the West Mountain Radio CBA to test some batteries that I had hoped
to use in my aircraft. Unfortunately the PC680 batteries have been laying
around for about 6 years, and had became quite discharged. I have used the
Battery Tender to charge them a few times, and have re-run the load test.
The results of two tests (with a recharge in between) are below, along with
a test of a Panasonic LC-XD1217P (12v, 17 Ah) of a similar form factor, and
with identical treatment.
https://docs.google.com/viewer?a=v&pid=explorer&chrome=true&srcid=0B5D8Jl0C8SZbNDQ0N2FiNzItYjA0Yy00MmQ5LTk0NjUtOWVkZTMwNzlmMTU3&hl=en
https://docs.google.com/viewer?a=v&pid=explorer&chrome=true&srcid=0B5D8Jl0C8SZbYmUyMzdhN2ItYjBkOS00MWJkLThlNWUtODUzNjRmMWVmOWE1&hl=en
My question is do you think that I can get the Odyssey batteries back to a
decent state? Below are the test results in text for those that don't want
to download the above PDFs with the pretty graphs.
Panasonic2:
Description: 6 Lead Acid cells, 17.0 Ah @ 7.50A
Started At: 16-Jan-11 2:56 PM
Discharge Rate: 7.50 A
Starting Voltage: 12.91 V
Ending Voltage: 10.50 V
Total Time (hh:mm:ss): 01:26:37
Tested Capacity: 10.878 Ah
Odyssey:
Description: 6 Lead Acid cells, 16.0 Ah @ 7.50A
Started At: 16-Jan-11 4:34 PM
Discharge Rate: 7.50 A
Starting Voltage: 12.56 V
Ending Voltage: 10.48 V
Total Time (hh:mm:ss): 00:39:53
Tested Capacity: 5.006 Ah
Odyssey2:
Description: 6 Lead Acid cells, 16.0 Ah @ 7.50A
Started At: 18-Jan-11 6:14 PM
Discharge Rate: 7.50 A
Starting Voltage: 12.80 V
Ending Voltage: 10.49 V
Total Time (hh:mm:ss): 00:39:37
Tested Capacity: 4.973 Ah
I really thought that the Odyssey batteries would hold a charge better than
a "standard" Panasonic. Also, the fact that the Panasonic is giving me
double the capacity is quite surprising. I have not yet tried my
desulfator, but that's my next step. I've only tested one of my two Odyssey
batteries, going to test the other "soon".
Thanks,
Mickey
--
Mickey Coggins
Message 2
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Subject: | Re: Odyssey PC680 Battery load tests |
Hello Mickey,
I would try the desulfator once as well. I had a lead acid battery from
a car where one cell seemed to be shorten. I did it leave on the
desulfator combined with a battery tender for 2 years and had to use it
for my car as that battery was to much depleted (cabin light on for 4
days with minus temp). That Battery showed full recovery for usage in my
car even that it is only 2/3 of the capacity of the original battery.
Give it a try, just a few cents of power you spend on it and let it
there for at least a month.
Werner
Message 3
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Subject: | Re: Transponder antenna signal |
I just saw a picture posted re: oil separator that showed a transponder
antenna mounted inside the lower cowling. Looked interesting but I'm not
sure which group it was.
john
On 1/16/2011 1:57 PM, Speedy11@aol.com wrote:
> Great responses from everyone. I appreciate each one. Like Old Bob,
> I've broken off stub antenna. I'd considered switching to a blade
> antenna, but didn't want to fit a new antenna. I will reconsider that
> option, but I'd like to investigate doing my own "antenna fairing."
> I've been gradually making streamlining changes to my RV-8A and I now
> claim the status of "world's fastest RV-8A." Maybe a streamlined
> transponder antenna will help a tiny bit more. My new target is 200
> KIAS in level flight at 1000" MSL. I'm already within reach of that goal.
> Thanks again for your responses.
> Stan Sutterfield
> I like that.
>
> You've been watching:
> http://www.youtube.com/watch?v=ftq8jTQ8ANE
> (excuse me if I'm being circular here)
>
> Bill "need something to do until it warms up" Watson
>
> On 1/14/2011 11:41 PM, Speedy11@aol.com wrote:
> > Bob - or other antenna gurus,
> > I want to streamline my transponder antenna. I have the short (3
> > inch) stub antenna with the ball on the tip. To streamline it I'm
> > going to make an epoxy resin fiberglass covering that will look like a
> > blade antenna.
> > Please confirm for me that streamlining with a fiberglass covering
> > will not affect signal performance.
> > Thanks,
> > Stan Sutterfield
> *
>
>
> *
Message 4
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Subject: | Re: Odyssey PC680 Battery load tests |
I used the West Mountain Radio CBA to test some
batteries that I had hoped to use in my aircraft.
Unfortunately the PC680 batteries have been
laying around for about 6 years, and had became quite discharged.
What kind of maintenance did you do on the batteries
while stored? The Battery Tender and Battery Minders
are not intended to be 'chargers' so much as 'maintainers'.
When you have 12v batteries on storage, it's a good idea
to clip them all together in parallel and have some
sort of sophisticated maintainer supporting the lot.
I use the Schumacher 1562 or a Battery Tender to
support my test batteries. Some are pushing 7 years
old with better than 80% of new capacity.
I really thought that the Odyssey batteries would
hold a charge better than a "standard" Panasonic.
Also, the fact that the Panasonic is giving me
double the capacity is quite surprising.
Were all three stored under the same conditions?
I have not yet tried my desulfator, but
that's my next step. I've only tested one of my
two Odyssey batteries, going to test the other "soon".
We'll be interested to hear what you discover.
Bob . . .
Message 5
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Subject: | Robust transponder antennas |
I've been away from the home 'puter for a few days
and didn't have access to my big archive of reference
documents when the List was discussing transponder
antennas.
Got home a few hours ago and posted a patent issued
in '61 for what is euphemistically called a "scimitar"
antenna.
http://www.aeroelectric.com/Reference_Docs/Antenna/Scimitar_Patent_3015101.pdf
I recalled seeing these all over the empannage belly
of the B-52. They looked like tie-down rings except that
there was about a half dozen of various sizes. They
were associated with the electronic counter-measures
system. I was a bomb-nav guy so I didn't get any schooling
on them.
Years later I was thinking about making a robust
transponder antenna using this design philosophy
but never got around to it. Others here on the List
might be interested in trying it out. Note that
where the SWR on the exemplar antenna in the patent
goes below 2:1 (4,000 Mhz) the horizontal radiation
pattern goes pretty circular.
An antenna could be crafted from aluminum or perhaps
brass and thick enough to offer the wished-for mechanical
robustness. The edges could also be sculptured as
necessary for aerodynamically appealing affect.
It was interesting to contemplate the development history
of this antenna. While based on development work by
the Turner guys pre 1958 the patent wasn't issued until
1961. The airplanes I was working on were built in the
1954-58 time frame and already had several sizes installed.
Similar antennas on the spacecraft programs were faired
with radomes. The antennas on the B-52 were bare and
hung right out in the breeze.
Anywho, for what it's worth, this might be the basis
for a nice DIY antenna project. It would lend itself
well to an article featuring fabricate-to-drawings
illustrations.
Bob . . .
Message 6
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I know copper is generally used, but is there any reason NOT to use
aluminum to construct a ground buss bar?
John Grosse
Message 7
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At 09:27 PM 1/18/2011, you wrote:
>
>I know copper is generally used, but is there any reason NOT to use
>aluminum to construct a ground buss bar?
How do you plan to attach wires to it?
The bus bar designs suggested by AeroElectric
Connection and B&C products go to some lengths
to reduce threaded fasteners to a minimum. There
are none on the panel ground bus . . . and only
the fat wires are brought to threaded studs.
Bob . . .
Message 8
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Marty,
I thought that might pique someone's interest.
I'm still experimenting so my "tricks" thus far are still unproven. But,
like Dave Anders and Bob Axsom, I'm making small gradual changes, some of
which have failed, to increase speed and improve efficiency.
I am on to something. Before my recent aero changes I could get about 185
KIAS at 1000' MSL. My goal was to reduce drag so as to reach 190 KIAS.
Last week I got 193. My new goal is 200. 193 is pretty good for a
normally aspirated, stock cowling, 3 blade prop, nose dragger.
I have several more ideas for speed improvement and I'll be trying them
during the next few months.
I have no objection to sharing my ideas so long as guys don't claim them as
their own. When I have copied others guy's ideas for building techniques
, I gave them credit.
My speed improvements can be done by anyone and I have tried them after
doing a little bit of aero study and talking to some guys educated in
aerodynamics. If guys aren't interested in making their own, I may make them
available for sale. We'll see.
If anyone would like to see what I'm doing, you can visit my web site at
_www.rv-8a.net_ (http://www.rv-8a.net) and look at pages posted since Jan
2010. The primary gain came from my Speedy Cuffs added to the main gear
(shown in Jan 2011). The web site will explain and has photos.
If you have questions, feel free to write me.
Regards,
Stan Sutterfield
PS - Don't tell the guys in the SARL - I want to beat them this year. : )
Stan,
Interesting post "world's fastest RV-8A", indeed. How about sharing some
of
the tricks you used to achieve this goal. You maybe onto something here,
starting a new trend in "experimenting".
Marty RV-6A N826ME
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