Today's Message Index:
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1. 08:29 AM - Re: Re: Schematic for twin PM alternators (Paul Eckenroth)
2. 01:28 PM - landing and nav/strobe LED lights (messydeer)
3. 03:26 PM - Re: Schematic for twin PM alternators (user9253)
4. 06:21 PM - Engine Ground (BobbyPaulk@comcast.net)
5. 07:35 PM - Re: Engine Ground (Charlie England)
6. 08:16 PM - Re: Rotax 914 Generator, Alternator, Starting and Fuel Pump Cont (user9253)
7. 08:32 PM - Re: Rotax 914 Generator, Alternator, Starting and Fuel Pump Cont (user9253)
8. 08:43 PM - Re: landing and nav/strobe LED lights (user9253)
9. 09:04 PM - Re: Re: Rotax 914 Generator, Alternator, Starting and Fuel Pump Cont (Ken Ryan)
10. 11:18 PM - Re: landing and nav/strobe LED lights (messydeer)
Message 1
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| Subject: | Re: Schematic for twin PM alternators |
I like the revised schematic in that it is breaking the AC feed from the
dynamo and therefore eliminating any concern about what the regulator will
do with the AC current when it is not engaged. However, a failure in the
charging circuit that causes the crowbar to trip the AC current will
probably be in the regulator. You will still have battery voltage back
feeding the regulator through the B tab. Can that create any problems.
Is there a reason that the capacitor is in the position shown. I would
have thought it should be attached to the B output since it's purpose is to
smooth out the voltage output.
The Onex is a small aerobatic plane that will be flown VFR daytime only.
However it will be equipped so it can be flown at night and escape from any
inadvertent VFR into IIFR situations. As such and with the backup generator
and independent ignitiion I don't feel that a E bus is needed.
I welcome all input.
Paul
On Wed, Jan 20, 2016 at 4:10 PM, user9253 <fransew@gmail.com> wrote:
>
> I revised my schematic and attached it.
> The relays now switch the AC. All electrical power can be shut off on the
> engine side of the firewall.
> The DC output from each regulator is fused separately so that a fault in
> one will not disable the other one.
>
> --------
> Joe Gores
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=452147#452147
>
>
> Attachments:
>
> http://forums.matronics.com//files/revmaster5a_214.pdf
>
>
Message 2
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| Subject: | landing and nav/strobe LED lights |
Hey!
I have a Sonex flying...er in the hangar now I hope...and want to put LED lights
in it. I've seen some nav/pos/strobe lights from Aveo
https://www.aircraftspruce.com/catalog/elpages/aveopowerburst.php which are $500 a pair. I think it could be more than I want to tackle to fab something like that and may just buy them off the shelf.
Landing lights seem easier to fab. I'll be looking for a single very bright LED
light array. maybe as simple as getting one from Mauser. Any idea how bright
'bright' is? I see that Duckworks lists their 2nd tier LED light at 320,000 candlepower.
I've also seen PAR36 listed, which I believe is the pattern lights
shoot. Duckworks also mentions 'no RF interference', which makes me wonder if
there'd normally be a problem without some fix.
Suggestions?
--------
Dan
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=452173#452173
Message 3
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| Subject: | Re: Schematic for twin PM alternators |
> will still have battery voltage back feeding the
> regulator through the B tab
When I turn on the master switch on my RV-12 and before
starting the Rotax, battery voltage is being back fed to the
regulator B terminal. Of course the regulator is in working
condition. Who knows what regulator failure modes there are
besides low voltage.
I do not think that it matters much where the capacitor is
connected to the positive supply as long as it is connected
whenever the alternator is working. I think it is a good idea
to use a fuse or circuit breaker to protect the electrical
system against the capacitor shorting.
The E-Bus is the main feature of Bob's designs that improves
upon legacy aircraft electrical systems. It provides an
alternate current path if the main path fails. I recommend it.
I have attached another schematic that incorporates some ideas
suggested by others. I am not necessarily recommending it.
The design has an additional circuit breaker and an additional
capacitor. It is more complicated to wire, but from a pilot's
perspective, there is still one alternator switch and one
master switch. If there is a concern about the master switch failing,
then install 2 of them next to each other wired in parallel.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=452175#452175
Attachments:
http://forums.matronics.com//files/revmaster6a_153.pdf
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I happened to be helping repair a Cessna 170-B and noticed the engine ground was
routed only about 4" aft of the rubber mounts and attached to a tab on the motor
mount in lieu of the firewall. This saved a few feet of heavy wire and a
few ounces.
Message 5
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| Subject: | Re: Engine Ground |
On 1/21/2016 8:09 PM, BobbyPaulk@comcast.net wrote:
> I happened to be helping repair a Cessna 170-B and noticed the engine
> ground was routed only about 4" aft of the rubber mounts and attached
> to a tab on the motor mount in lieu of the firewall. This saved a few
> feet of heavy wire and a few ounces.
>
>
And added several tenths of an ohm to the resistance of the starting
circuit.
Message 6
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| Subject: | Re: Rotax 914 Generator, Alternator, Starting and Fuel |
Pump Cont
In case of over voltage the 5 amp fuse will blow before the 5
amp breaker. Eliminate the fuse.
The note on the drawing says that the main bus can be separated
from the battery. If that means to shut off the master, I do
not know why anyone would want to do that.
I suggest adding a relay and lamp to indicate that the 20 amp
dynamo is not working. Red lamp should go out when
rectifier/regulator is working. See attached pdf.
When the momentary push button switch is first pressed, the 5
amp fuse will carry current to fuel pump #1 before the
rectifier/regulator puts out full voltage. That fuse could
blow if not rated to handle the fuel pump current.
Resize the rectifier/regulator fuse from 20 amps to whatever
the pump requires. 10 amps?
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=452186#452186
Attachments:
http://forums.matronics.com//files/rotax_914_pump_138.pdf
Message 7
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| Subject: | Re: Rotax 914 Generator, Alternator, Starting and Fuel |
Pump Cont
Actually the relay is not even needed. The lamp will illuminate per the attached
pdf if the voltage is not equal at the two points where the lamp connects.
The fuel pump will pass lamp current to ground.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=452187#452187
Attachments:
http://forums.matronics.com//files/rotax_914_pump_337.pdf
Message 8
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| Subject: | Re: landing and nav/strobe LED lights |
This website explains the difference between candlepower and lumens:
http://www.flashlightuniversity.com/lumens-vs-candlepower/
I could be wrong but believe that candlepower is misleading marketing hype.
Lumens is what should be compared.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=452188#452188
Message 9
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| Subject: | Re: Rotax 914 Generator, Alternator, Starting |
and Fuel Pump Cont
Thanks Joe for your comments. Here are my comments on your comments:
1. In case of over voltage the 5 amp fuse will blow before the 5 amp
breaker. Eliminate the fuse.
Okay, I didn't think of this. My "Bus" is a fuseblock so there is
automatically a fuse associated with each circuit. Maybe I could put a 10
amp fuse in there, and then keep the 5 amp breaker for overvoltage
protection? The alternative would be to break this circuit out of the
fuseblock. Seems easier to just use a larger fuse.
2. The note on the drawing says that the main bus can be separated from the
battery. If that means to shut off the master, I do not know why anyone
would want to do that.
Simple answer--smoke in the cockpit. In that case the #1 priority is to try
to stop the fire. First step, shut down all the electric not necessary to
keep the engine running. Hit the master, which opens the battery relay,
which shuts down all the circuits except the main fuel pump.
3. I suggest adding a relay and lamp to indicate that the 20 amp dynamo is
not working.
I have Dynon Skyview with the ability to monitor two voltage sources. I
would think this would be sufficient to monitor the health of the 20 amp
integrated generator.
4. When the momentary push button switch is first pressed, the 5 amp fuse
will carry current to fuel pump #1 before the
rectifier/regulator puts out full voltage.
I didn't think of this either. I should make that a 10 amp fuse. Five amps
would "probably" work but it is too close to the edge for a critical
component.
5. Resize the rectifier/regulator fuse from 20 amps to whatever
the pump requires. 10 amps?
On that circuit I am showing a 5 amp fuse at the bus and a 20 amp circuit
breaker on the panel. We have already agreed (in #4 above) that the fuse
should be 10 amp. The 20 amp breaker is really only there to give me a way
to shut down the integrated generator if necessary. Is there any good
reason it should be 10 amp instead of 20 amp? Seems like either one would
be fine.
Thanks for your comments. Hope you follow up, and hope others will chime in
too.
On Thu, Jan 21, 2016 at 7:12 PM, user9253 <fransew@gmail.com> wrote:
>
> In case of over voltage the 5 amp fuse will blow before the 5
> amp breaker. Eliminate the fuse.
> The note on the drawing says that the main bus can be separated
> from the battery. If that means to shut off the master, I do
> not know why anyone would want to do that.
> I suggest adding a relay and lamp to indicate that the 20 amp
> dynamo is not working. Red lamp should go out when
> rectifier/regulator is working. See attached pdf.
> When the momentary push button switch is first pressed, the 5
> amp fuse will carry current to fuel pump #1 before the
> rectifier/regulator puts out full voltage. That fuse could
> blow if not rated to handle the fuel pump current.
> Resize the rectifier/regulator fuse from 20 amps to whatever
> the pump requires. 10 amps?
>
> --------
> Joe Gores
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=452186#452186
>
>
> Attachments:
>
> http://forums.matronics.com//files/rotax_914_pump_138.pdf
>
>
Message 10
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| Subject: | Re: landing and nav/strobe LED lights |
Thanks, Joe :-)
Good to hear from you again!
Dan
--------
Dan
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=452190#452190
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