Today's Message Index:
----------------------
1. 07:02 AM - Re: Icom A6 Power Supply (rose9065f)
2. 08:32 AM - Re: Re: New Z-8 drawing (Robert L. Nuckolls, III)
3. 08:32 AM - Re: Firewall Penetration (Robert L. Nuckolls, III)
4. 09:06 AM - Re: Icom A6 Power Supply (rvtach)
5. 10:42 AM - Re: Icom A6 Power Supply (Robert L. Nuckolls, III)
6. 12:20 PM - Re: Icom A6 Power Supply (Joe Ronco)
7. 02:50 PM - Prop crack & control stick stops (F. Tim Yoder)
8. 06:50 PM - Re: Prop crack & control stick stops (Bob McCallum)
Message 1
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Subject: | Re: Icom A6 Power Supply |
I made a cable with a 10 ohm resistor in series with the 12 volt feed from the
plane to the A24. This puts a small charge into the A24 battery, but the radio
still operates from its internal battery. Works fine. !0 ohms is not too critical.
The wall charger says 200ma. Dropping 13 volts to 11.7 at 200ma is
about 6.5 ohms Bigger resistor smaller trickle charge.
Jim
--------
KF2 582
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=307849#307849
Message 2
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Subject: | Re: New Z-8 drawing |
At 02:31 PM 8/6/2010, you wrote:
>
>Bob,
>Just to be clear, in a previous exchange you said that ALL essential
>engine power should come from the Batt Bus. Does that mean redundant
>systems (#2pump, #2ignition, #2EFI {switch}) also reside on the batt bus?
One set would run from the battery bus, the other from
the main bus.
>If the answer is yes, what is the reasoning for not having them on
>the main (separate) bus?
The design goal is to be able to shut down
as much of the electrical system as possible
without killing the engine. So if you get a
severe electrical event (smoke in the cockpit)
you can turn off the battery master and alternator
switches without affecting engine ops.
So the primary engine support hardware would
run from the battery bus, secondary engine
support would power from the main bus.
This separation covers a smoke-in-the-cockpit
event without having to manage any switches
over and above the power sources.
I've discovered any really attractive
high-current diodes for aux alternator b-lead
isolation. Electrically suited components
are pretty bulky after you get the heat-sinked.
They're also more expensive than a contactor.
So your original idea for tasking a single contactor
with ground power management AND b-lead crash
safety has some warm fuzzies about it.
My grand daughter was visiting most of last
week which was a most pleasant but commanding
distraction. I'll get my head back on things
electric pretty soon.
Bob . . .
Message 3
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Subject: | Re: Firewall Penetration |
At 04:26 PM 8/6/2010, you wrote:
>Hi all,
>
>I am about to make the firewall penetrations for my all electric RV
>8. Is there any reason that I cannot run the main #2 power wire to
>the starter contactor, B lead from the standby alternator, both
>alternator F-leads and the sensor wires from the CHT, EGT, oil
>pressure, oil temp, fuel pressure and fuel flow all through the same
>penetration? I have a nice Safeair kit with a one inch stainless
>pipe. They would all fit but I was wondering if there would be any
>signal interference with the sensors next to the fat wires.
They should be fine sharing the same penetration.
Bob . . .
Message 4
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Subject: | Re: Icom A6 Power Supply |
rose9065f wrote:
> I made a cable with a 10 ohm resistor in series with the 12 volt feed from the
plane to the A24. This puts a small charge into the A24 battery, but the radio
still operates from its internal battery. Works fine. !0 ohms is not too
critical. The wall charger says 200ma. Dropping 13 volts to 11.7 at 200ma is
about 6.5 ohms Bigger resistor smaller trickle charge.
>
> Jim
I had forgotten I had any experience with this. When I was in charge of aircraft
parking for COPPERSTATE Fly-In we used a bunch of A-6s, which as mentioned earlier
won't transmit when it's on the charger. Who's idea was that anyway? With
heavy use the batteries died in under 2 hours and then we were going through
a set of AAs every 30 minutes. Our radio guy did something similar to what Jim
here did by soldering a bunch of diodes in series inside the AA adapter battery
pack to get the right voltage and then bringing a cable/cigarette lighter
plug out to run off my golf cart battery. I don't remember exactly what diodes
he used or how many but it worked like a charm.
If you're is interested I can find out exactly how he did this. Just have to get
out to the airport and open up his creation and see exactly what's in there.
I'll take a photo or 2 while I'm at it. I see that the AA pack is only about
15 dollars at Chief and the half dozen or so diodes would only cost a couple dollars.
Jim in Tucson
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=307864#307864
Message 5
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Subject: | Re: Icom A6 Power Supply |
>The A23 can trickle or boost charge. I've heard good things about
>airborne ICOM handhelds (mine works good in flight), and panel mount
>NAV/COMs are $$$.
I've always had very good luck with Icom radio
performance (20+ years ago) but I've not acquired
any experience with newer products. If one assumes
they've maintained or refined their legacy design
and business models in a good way, the level
of customer satisfaction for performance should
still be very high.
> I'd be careful about connecting your A6 directly to aircraft power.
Agreed. But your comments about the power adapter
putting out 10v raised some new flags. What we're
needing here is an operating support power source
to augment batteries . . . not a battery charger.
The 10V value along with other comments about
an 11.7 volt transmitter shutdown suggest a
solution that keeps external power constrained
to 10-11 volts but without regard to charging
batteries which is a more demanding protocol.
Just adding a resistor in series with the power
lead is problematic . . . because the current
demands of the radio are all over the place.
Receiver quiet (squelched) is the lowest drain.
Receiver working and putting out audio power
is somewhat higher. Transmitter working is
MUCH higher.
So I think it's a pretty safe bet to design a
noise free (linear) step-down regulator set
for say 10.5 volts using an LM317 regulator
from radio shack.
The data sheet for the LM317 . . .
http://cache.national.com/ds/LM/LM117.pdf
. . . says that with
a 200 mA load at 50C case temperature on the
device, the dropout voltage (differential
between input and output where it looses
regulation) is on the order of 1.6 volts.
Emacs!
This means that a 10.5V regulator crafted
with this part would maintain regulation
performance with an input supply as low
as 10.5 + 1.6 = 12.1 volts which certainly
covers all operations with the alternator
working . . . and if the alternator is not
working, one can reasonably expect the
radio to work fine on internal batteries
for the time it takes to comfortably put
wheels on the ground.
I'm 99% sure that crafting the circuit
below will produce a power source that
will operate the radio. It may not charge
the battery . . . so use the radios normal
charger(s) to top of batteries before flight.
Emacs!
Bob . . .
Message 6
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Subject: | Icom A6 Power Supply |
The Batteries America CP-11L might be a good way to go for use with 12 Volt
plane power. See:
http://www.mypilotstore.com/mypilotstore/sep/3490
User reviews at bottom of page give it 4 or 5 stars.
Joe R
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Robert L.
Nuckolls, III
Sent: Saturday, August 07, 2010 11:41 AM
Subject: Re: AeroElectric-List: Icom A6 Power Supply
The A23 can trickle or boost charge. I've heard good things about airborne
ICOM handhelds (mine works good in flight), and panel mount NAV/COMs are
$$$.
I've always had very good luck with Icom radio
performance (20+ years ago) but I've not acquired
any experience with newer products. If one assumes
they've maintained or refined their legacy design
and business models in a good way, the level
of customer satisfaction for performance should
still be very high.
I'd be careful about connecting your A6 directly to aircraft power.
Agreed. But your comments about the power adapter
putting out 10v raised some new flags. What we're
needing here is an operating support power source
to augment batteries . . . not a battery charger.
The 10V value along with other comments about
an 11.7 volt transmitter shutdown suggest a
solution that keeps external power constrained
to 10-11 volts but without regard to charging
batteries which is a more demanding protocol.
Just adding a resistor in series with the power
lead is problematic . . . because the current
demands of the radio are all over the place.
Receiver quiet (squelched) is the lowest drain.
Receiver working and putting out audio power
is somewhat higher. Transmitter working is
MUCH higher.
So I think it's a pretty safe bet to design a
noise free (linear) step-down regulator set
for say 10.5 volts using an LM317 regulator
from radio shack.
The data sheet for the LM317 . . .
http://cache.national.com/ds/LM/LM117.pdf
. . . says that with
a 200 mA load at 50C case temperature on the
device, the dropout voltage (differential
between input and output where it looses
regulation) is on the order of 1.6 volts.
Emacs!
This means that a 10.5V regulator crafted
with this part would maintain regulation
performance with an input supply as low
as 10.5 + 1.6 = 12.1 volts which certainly
covers all operations with the alternator
working . . . and if the alternator is not
working, one can reasonably expect the
radio to work fine on internal batteries
for the time it takes to comfortably put
wheels on the ground.
I'm 99% sure that crafting the circuit
below will produce a power source that
will operate the radio. It may not charge
the battery . . . so use the radios normal
charger(s) to top of batteries before flight.
Emacs!
Bob . . .
Message 7
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Subject: | Prop crack & control stick stops |
'OC' & all,
The first picture showing a crack in my prop tip (fuzzy). # 2 & 3 show
the tab with adjustable bolt for aileron stop, one on each stick. #4
shows the elevator stops mounted to the bottom of the pilot seat.
Tim
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Message 8
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Subject: | Prop crack & control stick stops |
OK, I'll bite. How do these pictures relate to aircraft electrical systems??
What's the question being asked or the information conveyed?
Do not archive !
Bob McC
_____
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of F. Tim
Yoder
Sent: Saturday, August 07, 2010 5:48 PM
Subject: AeroElectric-List: Prop crack & control stick stops
'OC' & all,
The first picture showing a crack in my prop tip (fuzzy). # 2 & 3 show the
tab with adjustable bolt for aileron stop, one on each stick. #4 shows the
elevator stops mounted to the bottom of the pilot seat.
Tim
Your message is ready to be sent with the following file or link
attachments:
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059
060
006
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