Today's Message Index:
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1. 03:03 AM - Re: latching relays (Jan de Jong)
2. 03:30 AM - Re: remote battery charging (John Ciolino)
3. 05:01 AM - Re: remote battery charging (Richard Reynolds)
4. 07:29 AM - Re: latching relays (user9253)
5. 07:37 AM - Re: remote battery charging (Bill Watson)
6. 08:13 AM - Re: remote battery charging (user9253)
7. 08:56 AM - Re: latching relays (Robert L. Nuckolls, III)
8. 08:46 PM - Remote Angle of Attack Indicator (Vern Little)
Message 1
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Subject: | Re: latching relays |
May I offer a thought in support of latching relays.
How likely is it that the fault that causes smoke in the cockpit
coincides with the failure of the relay to open?
Wouldn't they be generally independent failures?
I do agree that if you have plenty of amps it is hard to find a
compelling reason to use them.
On the other hand - Tyco must see a market for automotive power saving.
For the minimalist system with PM alternator I think the notion of using
latching relays can be played with.
Jan de Jong
Message 2
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Subject: | remote battery charging |
Take a look at www.powerlet.com. They make receptacles for charging
motorcycle batteries which could be adapted. Especially if, as Bob suggests,
you mount them inside the cockpit. I don't think there are any 3 wire
receptacles so you will have to use one for each battery or split the power
feed. The nice thing is that you can get a receptacle with the 2 prong SAE
connector that will plug into the harness from most battery tender type
chargers.
John Ciolino
RV-8 N894Y
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Robert L.
Nuckolls, III
Sent: Saturday, March 12, 2011 10:45 PM
Subject: Re: AeroElectric-List: remote battery charging
Dual batteries will be located in the aft fuselage for W & B
issues...I want to be able to recharge the batteries by installing a
(more or less) flush, weatherproof receptacle and plug in the side of
the FG fuselage, one which would replace the alligator clips on the
charger. I believe I erred in buying a "Piper type socket" and "Piper
type plug" (Acft. Spruce p/n 11-00500 and p/n 11042) thinking they
would serve, but have concluded that their purpose is for "jump
starting" rather than battery recharging. (If this is in fact so,
they'll be returned.) Soooooo...can anyone suggest a brand/type/model
receptacle - plug combination suitable for battery charging?
You CAN charge batteries through such connectors . . . as
well as crank engines if that need arises. It depends
on how you wire the connector to your airplane. If you
have dual batteries, then getting the pair of batteries
connected together for charging purposes poses a problem
for needing to have contactors closed.
So if the goal is battery charging/maintenance only,
then about anything is fine. Take a look at trailer
lighting connectors like . ..
Emacs!
Walmart automotive has some like this. You need
three or more pins. One for ground and one to each
battery through an inline fuse (can be a fuse
on the battery bus). If you don't need to lock
the canopy closed during charging ops, consider
mounting the jack inside the airplane so you don't
need to poke a hole in the skin. If the socket is
inside, remove the spring loaded "lid". It's not
needed and only gets in the way.
I'm now looking at using (2) Odyssey #545s (14AH each) for a total
weight of 23.4 pounds. I see that B & C lists a slightly more
powerful (16AH) battery, a BC116-1 w/ weight of 14.6 pounds (each).
I can't seem to find any performance specs . . .
If you're doing the yearly change-out of the oldest
battery, absolute performance is not significant.
The two batteries in parallel (on less than two
years old, the other less than one year old)
are going to crank your engine just fine. Buy
the cheapest batteries you can find that have
connections which support cranking currents.
Bob . . .
Message 3
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Subject: | Re: remote battery charging |
Fred,
In the aviation electrical section at West Marine, look for:
Marinco ConnectPro Trolling Motor Plug and Receptacle, model 1422591, $45.
It is small, light and heavy duty. I put mine under the plane. I do not "jump start"
the plane from this connection, but sometimes there is a heavy current 10-15
A when recharging a dead battery after the master switch has been left on.
I used Bob's Z-31 design to protect the battery from reverse polarity and 24 V.
Richard Reynolds
Norfolk VA
RV-6A - N841RV
Message 4
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Subject: | Re: latching relays |
Another option for using a conventional master contactor is to energize it at full
voltage, then hold it at reduced voltage. I believe that Bob was working
on a microprocessor based device that would do that. One could also make their
own reduced voltage holding circuit using a resistor or diodes to drop the voltage
along with a 3-position master switch: off, low voltage, and normal voltage.
Or how about this IC along with a Power MOSFET?
http://ww1.microchip.com/downloads/en/DeviceDoc/21448c.pdf
I was going to use this IC to control the elevator trim servo. I think it would
also work with the master contactor. It applies full voltage for a timed interval,
then puts out a PWM voltage, for a price of $1.38.
Joe
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=333732#333732
Message 5
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Subject: | Re: remote battery charging |
On 3/12/2011 10:45 PM, Robert L. Nuckolls, III wrote:
> If you don't need to lock
> the canopy closed during charging ops, consider
> mounting the jack inside the airplane so you don't
> need to poke a hole in the skin. If the socket is
> inside, remove the spring loaded "lid". It's not
> needed and only gets in the way
>
> Bob . . .
>
I took this approach on my not-yet-flying RV10 with dual Odysseys. Used
these "XLR" connectors:
http://www.radioshack.com/product/index.jsp?productId=2104076#
http://www.radioshack.com/product/index.jsp?productId=2103444&CAWELAID=107593419
With dual batteries and scheduled swap outs, I'm thinking charging
should never become a regular or normal procedure. Therefore, no holes
in the skin.
I mounted the XLR connector on the rear baggage bulkhead, inches from
the batts, and bypassed the contactors with inline fuses. The baggage
door has to be opened to access the jack.
My charger came with an inline plug so I can attach the regular
alligator clamps or the XLR plug.
Thanks Bob and the List for guiding me on this.
Bill "all I talk about these days is paint" Watson
Message 6
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Subject: | Re: remote battery charging |
If you have a cigarette type power outlet in the cockpit, you can use one of these
chargers for sale on eBay: https://lh6.googleusercontent.com/_9Rmupq9lpCs/TXzXScNgc-I/AAAAAAAAAKk/uPU9_yO6qpM/Charger.png
WalMart sells a similar charger http://www.walmart.com/ip/Schumacher-SpeedCharge-Battery-Maintainer-and-Charger/13005742 but you will have to buy a separate cigarette lighter plug. Or you can put flush mounted anchor nuts or nutplates on the outside of the fuselage and use the ring terminals that come with the charger along with some screws.
Joe
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=333736#333736
Message 7
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Subject: | Re: latching relays |
At 05:59 AM 3/13/2011, you wrote:
May I offer a thought in support of latching relays.
How likely is it that the fault that causes smoke in the cockpit
coincides with the failure of the relay to open?
Wouldn't they be generally independent failures?
Very low risk.
I do agree that if you have plenty of amps it is hard to find a
compelling reason to use them.
On the other hand - Tyco must see a market for automotive power saving.
I suspect that 'power saving' is way down
on the list of design goals. Increased longevity
due to low values of internally generated heat
might be a big driver. The mechanically latched
device is not going to aggravate the effects of
a transient event. It wouldn't drop out and re-close
during a severe brown-out . . . and the folks who
brought these to market may not have considered
either . . .
For the minimalist system with PM alternator I think the notion of
using latching relays can be played with.
Absolutely. I should remind readers that my
background calls for sifting the sands of
risk for the purposes of keeping folks-who-know-
more-about-airplanes-than-we-do happy. I'm
not implying that regulatory mandates do not
mesh well with elegant solutions. But they DO
tend to discourage new solutions from emerging
and evolving.
Let's do our own sand-sifting.
Bob . . .
Message 8
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Subject: | Remote Angle of Attack Indicator |
A few months ago, there was a lot of discussion on providing remote
(glareshield) mounted AoA indicators. Vx Aviation had developed such a unit
in 2006, but discontinued it after a few years due to lack of demand and
high support costs.
Things have changed.
It looks like the average pilot appreciates AoA a lot more than they did 5
years ago. In addition, the original unit, which was only compatible with
Dynon D10A/D100/D120 systems is also now supported by GRT Avionics, and both
MGL and Garmin are looking into supporting it as well.
Due to the customer demand and the support from the OEM's, I've reconsidered
reintroducing the V-Speed ADS Remote AoA indicator.
More information is available here: www.vx-aviation.com. If anyone is
interested in this product, please contact me to put on the notification
list. Alternatively, you can order right off of the website, however, we
won't be shipping for a few weeks yet.
Thanks,
Vern Little
Vx Aviation
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