Today's Message Index:
----------------------
1. 05:20 AM - Re: I forgot how to list on the list (Robert L. Nuckolls, III)
2. 08:44 AM - Van's Aircraft Statement (user9253)
3. 09:18 AM - Re: Van's Aircraft Statement (C&K)
4. 10:44 AM - Re: Kitfox vertical fin antenna opportunities (Eric Page)
5. 10:57 AM - Re: Van's Aircraft Statement (Charlie England)
6. 01:03 PM - Repair of Apollo GX65 (Janet Amtmann)
Message 1
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| Subject: | Re: I forgot how to list on the list |
At 07:42 PM 2/11/2021, you wrote:
>How do I list on the=C2 list.=C2 I do get the list in my emails.
>
>Jurgen Amtmann
Just send your posting to "aeroelectric-list@matronics.com"
with a new subject line. Everything sent to this address
is echoed to all List members.
Bob . . .
Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"
Message 2
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| Subject: | Van's Aircraft Statement |
Here is a quote from Van's Aircraft FLIGHT TRAINING SUPPLEMENT:
https://www.vansaircraft.com/wp-content/uploads/2020/10/RV-12iS-FTS-4.pdf page 6-6
> The Rotax 912 iS is equipped with two voltage regulators, one for each generator
on the engine. These regulators reject any unused electrical power as heat.
Allowing the power usage to fall below 7 amps for extended periods of time may
damage the regulators, especially on hot days.
That can not be true can it? Suppose that 21 amps are available but not
used by the aircraft electrical system. 21 amps x 14 volts = 300 watts
of heat that must be dissipated by the voltage regulators.
Don't modern permanent magnet voltage regulators work by shutting off the
output during part of the AC cycle using SCRs that are in series with the output?
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=500656#500656
Message 3
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| Subject: | Re: Van's Aircraft Statement |
Pretty sure I've read all of the current rotax manuals and bulletins
for that engine and there is no such information or caution anywhere.
(and it doesn't make sense anyway for something this large as Joe has
indicated). The temperature limit on the regulators is 80*C and rotax
insists that it be installed in the engine compartment. While there is
an optional additional heat sink available for regulator B it's still an
order of magnitude too small to handle that kind of heat.
Ken
On 12/02/2021 11:43 AM, user9253 wrote:
>
> Here is a quote from Van's Aircraft FLIGHT TRAINING SUPPLEMENT:
> https://www.vansaircraft.com/wp-content/uploads/2020/10/RV-12iS-FTS-4.pdf page 6-6
>
>> The Rotax 912 iS is equipped with two voltage regulators, one for each generator
on the engine. These regulators reject any unused electrical power as heat.
Allowing the power usage to fall below 7 amps for extended periods of time
may damage the regulators, especially on hot days.
> That can not be true can it? Suppose that 21 amps are available but not
> used by the aircraft electrical system. 21 amps x 14 volts = 300 watts
> of heat that must be dissipated by the voltage regulators.
> Don't modern permanent magnet voltage regulators work by shutting off the
> output during part of the AC cycle using SCRs that are in series with the output?
>
> --------
> Joe Gores
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=500656#500656
>
>
Message 4
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| Subject: | Re: Kitfox vertical fin antenna opportunities |
user9253 wrote:
> It took me awhile to realize that the vertical black object going through the
> middle of the ribs is actually the com antenna and not structural steel. Is
that
> a black plastic box at the bottom? What is inside of it? And what is the
> purpose of the triangular part that you are holding? Thanks
> Theoretically the steel tubes will block radio waves fore and aft. But one can
> not argue with the success of others. The installation looks good and I think
> that you will be happy with the antenna.
Yes, the antenna is sort of a fabric tape with, I presume, copper foil elements
bonded to it, then encased with a layer of fiberglass and resin. It's about
1" wide and perhaps 0.05" thick.
The "box" and triangular object are the same item: a small block of wood (painted
black). It's half of the clamp for the bottom end of the antenna.
The antenna's feed point is a ~1" cube in the center of the tape, located just
behind the diagonal steel tube. The BNC is just visible in the "Finished Installation"
photo.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=500658#500658
Message 5
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| Subject: | Re: Van's Aircraft Statement |
On 2/12/2021 10:43 AM, user9253 wrote:
>
> Here is a quote from Van's Aircraft FLIGHT TRAINING SUPPLEMENT:
> https://www.vansaircraft.com/wp-content/uploads/2020/10/RV-12iS-FTS-4.pdf page 6-6
>
>> The Rotax 912 iS is equipped with two voltage regulators, one for each generator
on the engine. These regulators reject any unused electrical power as heat.
Allowing the power usage to fall below 7 amps for extended periods of time
may damage the regulators, especially on hot days.
> That can not be true can it? Suppose that 21 amps are available but not
> used by the aircraft electrical system. 21 amps x 14 volts = 300 watts
> of heat that must be dissipated by the voltage regulators.
> Don't modern permanent magnet voltage regulators work by shutting off the
> output during part of the AC cycle using SCRs that are in series with the output?
>
> --------
> Joe Gores
Easy enough to test empirically, if you have the system.
IIRC, early rectifier-regulators really were 'shunt' style regulators,
that would align with the warning from Van's. Newer regulator designs do
seem to use 'switcher' style voltage control, which should function like
typical semiconductors and get hotter as more current flows to the load.
No idea what's used in the iS, but you'd hope it would be the more
modern type.
Charlie
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Message 6
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| Subject: | Repair of Apollo GX65 |
Does anyone know of someone that can repair an old Apollo GX 65 GPS/COM
radio? I bought it new many years ago and installed it in my RV6. On
power-up it did not work. No xmit or receive. The GPS window lights up
and cycles thru the initial tests, so the radio is getting power properly.
I get no satisfaction from Garmin who bought the line and then deleted it
from stock. I did a bench test and it is not transmitting or receiving.
The trays will not accommodate a different radio, I would have to rebuild
the whole instrument panel, but I'm leery of purchasing a used one (they
are available) and might get one with the same or other problem. At the
moment we are flying with a handheld, but that's a PITA. Any information
would be welcome.
Jurgen Amtmann
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