Today's Message Index:
----------------------
1. 06:47 AM - Re: Battery Tender performance (Robert L. Nuckolls, III)
2. 09:24 AM - Re: Battery Tender performance (Bill Watson)
3. 09:33 AM - Dynamic propeller balancing sensor. (Roberto Waltman)
4. 11:03 AM - Re: Dynamic propeller balancing sensor. (Robert L. Nuckolls, III)
5. 12:12 PM - Who would have thought? (Robert L. Nuckolls, III)
6. 01:14 PM - Re: Dynamic propeller balancing sensor. (Roberto Waltman)
7. 02:59 PM - Re: Dynamic propeller balancing sensor. (Robert L. Nuckolls, III)
8. 05:18 PM - Re: Who would have thought? (Charlie England)
9. 06:16 PM - Best Panel Dimmer for LEDs (mddickens@comcast.net)
10. 06:51 PM - Lacing goes main stream (Chris)
11. 09:26 PM - Re: Lacing goes main stream (Bill Watson)
12. 09:26 PM - Re: Lacing goes main stream (Dave Saylor)
13. 11:32 PM - Re: Best Panel Dimmer for LEDs (Robert L. Nuckolls, III)
Message 1
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| Subject: | Re: Battery Tender performance |
At 11:36 AM 9/5/2012, you wrote:
>
>The charger from Walmart is a Shumacher:
>https://dl.dropbox.com/u/60509998/DSC04046.JPG
>There were several models but this one seemed to be the right one
>for my Odyssey 680s
This is a very capable charger . . . and probably
appropriate to a program where batteries are
deeply discharged and then recharged such as
trolling motors, mobility carts, etc. If
one has the occasional need to put a 'fast'
charge on a car or rv battery, something with
this capability will cover more 'battery bases'
and the price is right . . . about $40.
If one wishes to do a simple top off and maintenance
on a battery on a hangared airplane, then
time-to-recharge is not an issue. Then a product
like the SEM1562A
http://tinyurl.com/25q3532
might be a better choice. For the same dollars,
one can have two such devices doing the guardian
angel thing over batteries in different
locations.
Don't wrapped around the 'features axle' for
chargers with lots of lights and buttons unless
you need to maximize battery life for devices
in deep-discharge service. Protocols finely
tuned to battery technology are not all that
different from each other. Further, 99 times
out of 100, you're putting an airplane away
with a fully charged battery. Ideally, the
battery in your airplane NEVER gets a deep
discharge cycle and will last a very long
time.
Bob . . .
Message 2
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| Subject: | Re: Battery Tender performance |
Makes a lot of sense.
In fact, I think that was the charger you were recommending at the time
I was asking. Impatiently, I went to my local Walmart and picked the
best thing I could find on the shelf that day.
Thanks,
Bill
do not archive
On 9/6/2012 9:46 AM, Robert L. Nuckolls, III wrote:
> <nuckolls.bob@aeroelectric.com>
>
> At 11:36 AM 9/5/2012, you wrote:
>> <Mauledriver@nc.rr.com>
>>
>> The charger from Walmart is a Shumacher:
>> https://dl.dropbox.com/u/60509998/DSC04046.JPG
>> There were several models but this one seemed to be the right one for
>> my Odyssey 680s
>
> This is a very capable charger . . . and probably
> appropriate to a program where batteries are
> deeply discharged and then recharged such as
> trolling motors, mobility carts, etc. If
> one has the occasional need to put a 'fast'
> charge on a car or rv battery, something with
> this capability will cover more 'battery bases'
> and the price is right . . . about $40.
>
> If one wishes to do a simple top off and maintenance
> on a battery on a hangared airplane, then
> time-to-recharge is not an issue. Then a product
> like the SEM1562A
>
> http://tinyurl.com/25q3532
>
> might be a better choice. For the same dollars,
> one can have two such devices doing the guardian
> angel thing over batteries in different
> locations.
>
> Don't wrapped around the 'features axle' for
> chargers with lots of lights and buttons unless
> you need to maximize battery life for devices
> in deep-discharge service. Protocols finely
> tuned to battery technology are not all that
> different from each other. Further, 99 times
> out of 100, you're putting an airplane away
> with a fully charged battery. Ideally, the
> battery in your airplane NEVER gets a deep
> discharge cycle and will last a very long
> time.
>
>
> Bob . . .
Message 3
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| Subject: | Dynamic propeller balancing sensor. |
I'm beginning to look into how difficult would it be to make my own
"poor man's" dynamic prop balancer.
Any recommendation for an of-the-shelf accelerometer to be used as sensor?
Thanks,
Roberto Waltman
Message 4
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| Subject: | Re: Dynamic propeller balancing sensor. |
At 11:32 AM 9/6/2012, you wrote:
>
>I'm beginning to look into how difficult would it be to make my own
>"poor man's" dynamic prop balancer.
>
>Any recommendation for an of-the-shelf accelerometer to be used as sensor?
There are a number of variable capacitor accelerometers offered
on eBay. You'll also need a charge amplifier and a 'charge-stable'
coax signal cable to run between the accelerometer and
amplifier.
http://tinyurl.com/9hhege2
http://tinyurl.com/9o324vg
http://tinyurl.com/8nd2y9y
The output of the amplifier may need to be filtered to
get rid of vibrational noises. I'm thinking a band-pass
filter centered on the vibration-frequency of some
handy test rpm would do the job.
Since your data is only used for comparative measurements,
calibration is not an issue. You could build your own
charge amplifier
http://tinyurl.com/d4t67hd
If charge amp is built into a single assemlby with
the accelerometer, you can do away with the fancy
'low capacitive noise' coax.
Then read the conditioned signal with an rms reading
voltmeter. This setup will only give you gross unbalance
data . . . it won't tell you which blade is heavy.
But test weights will quickly reveal whether adding
some small weight made things better (light blade)
or worse (heavy blade).
Just saw this critter
http://tinyurl.com/8ejraxb
which seems to be an internally signal conditioned
device. You could google the device and see
if there are any user's manuals floating around
out there.
I wasn't aware of this product.
Emacs!
Signal conditioning built in and designed for
use on machine tools. See:
http://tinyurl.com/8v3ejxe
Looks like just what you need. You'll still need
to filter irrelevant vibrations so that you can
take a close look at the relevant data.
Bob . . .
Message 5
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| Subject: | Who would have thought? |
Went out to the truck for parts purchased yesterday
for a remodel project and was startled to find that
one of my plastic switch boxes "changed shape"
in yesterday's afternoon sun.
Emacs!
I suppose a professional wire slinger would have warned me
about leaving them out there . . . or perhaps suggested that
I not used them at all. It's doubtful that temperatures
under my sheet rock will ever get that high . . . but it was
a surprise to see this part react so strongly to temperatures
on front seat of my truck.
Just a heads-up in case any of you are contemplating changes
to the wiring in your shop . . .
Bob . . .
Message 6
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| Subject: | Re: Dynamic propeller balancing sensor. |
Robert L. Nuckolls, III wrote:
> Then read the conditioned signal with an rms reading
> voltmeter. This setup will only give you gross unbalance
> data . . . it won't tell you which blade is heavy.
> But test weights will quickly reveal whether adding
> some small weight made things better (light blade)
> or worse (heavy blade).
Brilliant! I was planning to go the FFT and Adroid tablet GUI way.
For the one single airplane/propeller that I want to take care of, your
suggestion is perfect.
> Just saw this critter
> http://tinyurl.com/8ejraxb
> which seems to be an internally signal conditioned
> device.
> http://tinyurl.com/8v3ejxe
> Looks like just what you need. You'll still need
> to filter irrelevant vibrations so that you can
> take a close look at the relevant data.
Thank you very much for the pointers. (If going with capacitive sensors,
I almost forgot about the existence of charge amplifiers. Worked with
Kistler force plates, years ago.)
Roberto Waltman
Message 7
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| Subject: | Re: Dynamic propeller balancing sensor. |
>
>Thank you very much for the pointers. (If going with capacitive
>sensors, I almost forgot about the existence of charge amplifiers.
>Worked with Kistler force plates, years ago.)
I've used up this month's 'play money' exploring
some thermocouple readouts off eBay . . . but
as soon as it's doable, I'll pick up a self-amplified
accelerometer and get educated. I've got some
work coming over the hill that might benefit from
this technology.
Here's an exemplar band pass filter for 30 Hz, (1800
propeller RPM).
Emacs!
This is a rough order of magnitude swipe at the task.
You can fiddle with alternative gains, center frequency and bandwidth at:
http://tinyurl.com/9xwbwfm
Good luck!
Bob . . .
Message 8
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| Subject: | Re: Who would have thought? |
On 09/06/2012 02:10 PM, Robert L. Nuckolls, III wrote:
> Went out to the truck for parts purchased yesterday
> for a remodel project and was startled to find that
> one of my plastic switch boxes "changed shape"
> in yesterday's afternoon sun.
>
>
> I suppose a professional wire slinger would have warned me
> about leaving them out there . . . or perhaps suggested that
> I not used them at all. It's doubtful that temperatures
> under my sheet rock will ever get that high . . . but it was
> a surprise to see this part react so strongly to temperatures
> on front seat of my truck.
>
> Just a heads-up in case any of you are contemplating changes
> to the wiring in your shop . . .
>
> Bob . . .
>
Which way was the curved windshield facing (relative to the sun)? Even
without any 'concentration' from an accidental lens, temps can easily
reach >180 degrees in a closed car/truck....
Charlie
Message 9
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| Subject: | Best Panel Dimmer for LEDs |
I'm looking for an quality compact dimmer for LED lights. There are a number of
units for sale out there, but wondered if the list had any recommendations. These
would be used for cockpit lighting in my RV-8
Message 10
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| Subject: | Lacing goes main stream |
<http://news.yahoo.com/ancient-knots-keep-mars-rovers-laces-tied-red-1415412
22.html>
I used a little of both in my project tie wraps and knots.
-Chris
RV-10
N919AR
Message 11
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| Subject: | Re: Lacing goes main stream |
Interesting. I used a little both too. My spool of lacing cord is
always in my tool box.
Bill
On 9/6/2012 9:50 PM, Chris wrote:
>
> <http://news.yahoo.com/ancient-knots-keep-mars-rovers-laces-tied-red-141541222.html>
>
> I used a little of both in my project tie wraps and knots.
>
> -Chris
>
> RV-10
>
> N919AR
>
>
Message 12
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| Subject: | Re: Lacing goes main stream |
Following a couple of the links I saw a nice reference document from NASA:
http://www.hq.nasa.gov/office/codeq/doctree/87394.htm
Among (lots of) other things it shows how to tie a couple of
honest-to-goodness lacing knots. Always kinda wondered about that.
Dave Saylor
831-750-0284 CL
On Thu, Sep 6, 2012 at 6:50 PM, Chris <toaster73@embarqmail.com> wrote:
> <http://news.yahoo.com/ancient-knots-keep-mars-rovers-laces-tied-red-141541222.html>
>
> I used a little of both in my project tie wraps and knots.
>
> -Chris
>
> RV-10
>
> N919AR
>
>
Message 13
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| Subject: | Re: Best Panel Dimmer for LEDs |
At 08:16 PM 9/6/2012, you wrote:
>I'm looking for an quality compact dimmer for LED lights. There are
>a number of units for sale out there, but wondered if the list had
>any recommendations. These would be used for cockpit lighting in my RV-8
Which ones are you considering? LED dimmer requirements
can be markedly different than the devices suited to
incandescent bulbs. The dimmers we used to sell (and
B&C still does) are designed to produce a 4 to 13 volt
output over full rotation of the knob. 4 volts produces
a just visible glow from the lamps. This voltage range
produces a visible adjustment of light output over
the full range of rotation.
Other lighting sources have their own quirks. I did
a proposal for somebody on a 3 channel dimmer that
provided a uniform observable effect on light output
when controlling incandescent post lights, EL back
lighting and plasma displays. Each system required its
own span of control voltage and curve.
An LED fixture with say, three white lamps in
series will not produce any useful light until
the voltage is up to 7-8 volts . . . A modern
incarnation of the dimmer I cited above might offer
an adjustable constant current output that would
accommodate any combination of LEDs in series.
You're going to have to give us more information
as to how your lighting sources are configured
along with devices you've seen advertised and
want to consider.
Bob . . .
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