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1. 02:56 AM - Top Quality Online Assignment Help Services | Hire for A + G (oliversmith1407)
2. 04:31 AM - Re: Flap relay (!!!CORRECTION!!!) (Robert L. Nuckolls, III)
3. 04:39 AM - Re: Flap relay (Robert L. Nuckolls, III)
4. 04:47 AM - Re: Flap relay (Robert L. Nuckolls, III)
5. 07:54 AM - Re: Flap relay (!!!CORRECTION!!!) (Pat Little)
6. 08:11 AM - Re: Flap relay (Robert L. Nuckolls, III)
7. 08:14 AM - Re: Flap relay (!!!CORRECTION!!!) (Robert L. Nuckolls, III)
8. 06:46 PM - Re: Alternator stops working at low idle RPM (Argonaut36)
9. 07:41 PM - Re: Alternator stops working at low idle RPM (user9253)
10. 08:01 PM - Re: Alternator stops working at low idle RPM (user9253)
Message 1
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Message 2
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| Subject: | Re: Flap relay (!!!CORRECTION!!!) |
At 12:49 PM 12/11/2019, you wrote:
Does anyone have experience with the Aircraft Extras relay board? I
am considering two flap switches on my panel (Zenith STOL 750), one
for pilot and one for instructor, which would require a relay deck to
interface to the flap motor. The motor has a full-stall draw of 4A,
so it is way beyond the 1A rating of the Ray Allen relay deck. The
Aircraft Extras unit is rated at 10A so that should not be a problem,
but I was wondering if they have a good track record for reliability,
ease of installation, etc.
Buy a couple of these:
https://tinyurl.com/u2yld6d
wire them like this:
Corrected bad link from previous posting . . .
http://www.aeroelectric.com/PPS/Flight/Flaps/Flaps%208.pdf
Inexpensive, works good, lasts a long time
Bob . . .
Bob . . .
Message 3
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At 01:13 AM 12/12/2019, you wrote:
>Pat does this allow for "=C3=AFnstructor" override?
Yes . . . if BOTH switches are operated
but in opposing directions . . . the motor
simply stops.
>On Thu, 12 Dec 2019 at 08:23, Pat Little
><<mailto:roughleg@gmail.com>roughleg@gmail.com> wrote:
>That looks great, Bob. I guess I could use these
>for my trim system too, less $ than the RAC relay deck..
>I see that the 12V version of the unit you
>linked to is out of stock - should I look for
>any 5-pin automotive relay with similar specs,
>or is there something special about this one?
>I tweaked your wiring diagram for my 2-switch setup:
Check the corrected link for the intended
wiring diagram.
Nothing 'special' . . . any of the 12v, 5-pin
devices will do nicely. Some are offered with
a mating plug and wire harness which has some
advantages but sorta complicates diode installation.
But still doable.
Going right to the relay pins with fast-on terminals
lets you mount the diodes right at the relays . . .
Bob . . .
Message 4
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At 01:13 AM 12/12/2019, you wrote:
>Pat does this allow for "=C3=AFnstructor" override?
Yes . . . if BOTH switches are operated
but in opposing directions . . . the motor
simply stops.
>On Thu, 12 Dec 2019 at 08:23, Pat Little
><<mailto:roughleg@gmail.com>roughleg@gmail.com> wrote:
>That looks great, Bob. I guess I could use these
>for my trim system too, less $ than the RAC relay deck..
>I see that the 12V version of the unit you
>linked to is out of stock - should I look for
>any 5-pin automotive relay with similar specs,
>or is there something special about this one?
>I tweaked your wiring diagram for my 2-switch setup:
Check the corrected link for the intended
wiring diagram.
Nothing 'special' . . . any of the 12v, 5-pin
devices will do nicely. Some are offered with
a mating plug and wire harness which has some
advantages but sorta complicates diode installation.
But still doable.
Going right to the relay pins with fast-on terminals
lets you mount the diodes right at the relays . . .
Bob . . .
Message 5
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| Subject: | Re: Flap relay (!!!CORRECTION!!!) |
Thanks for the revised drawing Bob. I hadn't thought of diodes, but that
makes sense for the flap motor. Do you think diodes would be necessary for
a (much smaller) RAC trim motor?
As it happens, the relay you linked to on eBay is now back in stock...
On Thu, Dec 12, 2019 at 6:21 AM Robert L. Nuckolls, III <
nuckolls.bob@aeroelectric.com> wrote:
> At 12:49 PM 12/11/2019, you wrote:
> Does anyone have experience with the Aircraft Extras relay board? I am
> considering two flap switches on my panel (Zenith STOL 750), one for pilot
> and one for instructor, which would require a relay deck to interface to
> the flap motor. The motor has a full-stall draw of 4A, so it is way beyond
> the 1A rating of the Ray Allen relay deck. The Aircraft Extras unit is
> rated at 10A so that should not be a problem, but I was wondering if they
> have a good track record for reliability, ease of installation, etc.
>
>
> Buy a couple of these:
>
> https://tinyurl.com/u2yld6d
>
> wire them like this:
>
>
> Corrected bad link from previous posting . . .
>
> http://www.aeroelectric.com/PPS/Flight/Flaps/Flaps%208.pdf
>
>
> Inexpensive, works good, lasts a long time
>
>
> Bob . . .
>
>
> Bob . . .
>
Message 6
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At 01:13 AM 12/12/2019, you wrote:
>Pat does this allow for "=C3=AFnstructor" override?
Yes . . . if BOTH switches are operated
but in opposing directions . . . the motor
simply stops.
>On Thu, 12 Dec 2019 at 08:23, Pat Little
><<mailto:roughleg@gmail.com>roughleg@gmail.com> wrote:
>That looks great, Bob. I guess I could use these
>for my trim system too, less $ than the RAC relay deck..
>I see that the 12V version of the unit you
>linked to is out of stock - should I look for
>any 5-pin automotive relay with similar specs,
>or is there something special about this one?
>I tweaked your wiring diagram for my 2-switch setup:
Check the corrected link for the intended
wiring diagram.
Nothing 'special' . . . any of the 12v, 5-pin
devices will do nicely. Some are offered with
a mating plug and wire harness which has some
advantages but sorta complicates diode installation.
But still doable.
Going right to the relay pins with fast-on terminals
lets you mount the diodes right at the relays . . .
Bob . . .
Message 7
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| Subject: | Re: Flap relay (!!!CORRECTION!!!) |
At 09:52 AM 12/12/2019, you wrote:
>Thanks for the revised drawing Bob. I hadn't thought of diodes, but
>that makes sense for the flap motor. Do you think diodes would be
>necessary for a (much smaller) RAC trim motor?
>As it happens, the relay you linked to on eBay is now back in stock...
The diodes have nothing to do with the motor . . .
the diodes clamp off inductive de-energizing spikes
from the relay coils.
Check out this library of articles on the topic:
https://tinyurl.com/rw2juw8
Bob . . .
Message 8
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| Subject: | Re: Alternator stops working at low idle RPM |
Thanks for all the explanations and recommendations. I come back only now because
I wanted to fly one more time to do a few additional tests.
This is what I observed today:
Tachometer reads about 60-70 rpm slow (I checked it with a Trutach tachometer
that is supposed to be much more accurate than the airplane tachometer). So the
500 RPM idle that I previously reported is in reality 560-570.
When I throttle back to idle during engine warm-up, the voltmeter was reading 14.4
volts and not battery voltage, which I found disconcerting.
The voltmeter reads 14.4-14.5 V on the ground and 14.2 V in flight with the same
electrical loads
The alternator stopped operating on the runway after landing as in the recent previous
flights. Landing was intentionally as smooth as I could in order not
to cause a bad contact (if existing) to open.
After getting off the runway I tried (twice) to reset the alternator by turning
off all the electrical equipment including the master and then turning everything
on again. The alternator did not come online.
I contacted the maker of the voltage regulator. They said that alternator is supposed
to go offline at a very low RPM, but it should come back on, when the
RPM is increased. This is not the case with my alternator!
This alternator was installed recently. It is a factory refurbished alternator.
The previous alternator was also going offline, but not just after landing.
I replaced it, because it had already 800 hours on it, hoping that the new one
would not go offline.
The recommended tests are a bit complicated for me to perform. Access is difficult
in my airplane and it takes long time to disassemble and re-assemble.
I plan on bumping up the idle to 650-700 RPM and doing another test flight.
Thanks in advance for any additional suggestions and comments
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Message 9
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| Subject: | Re: Alternator stops working at low idle RPM |
A good test is to measure the alternator field voltage, preferably at the alternator
when it is offline and while engine is running.
--------
Joe Gores
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Message 10
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| Subject: | Re: Alternator stops working at low idle RPM |
Also monitor the voltage regulator input voltage.
--------
Joe Gores
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