Today's Message Index:
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1. 06:18 AM - Re: Lycoming EIS wirig recommendation (eschlanser)
2. 06:45 AM - Re: Re: Lycoming EIS wirig recommendation (Werner Schneider)
3. 01:13 PM - Re: WireViz (prestonkavanagh)
4. 06:29 PM - Re: Brownout Step Up Converter (johnbright)
5. 07:41 PM - Re: Revmaster 'dual' alterantors (dj_theis)
Message 1
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| Subject: | Re: Lycoming EIS wirig recommendation |
Thanks for the link.
Is the Lycoming EIS an off-the-shelf or a clean sheet system and who makes it?
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=498152#498152
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| Subject: | Re: Lycoming EIS wirig recommendation |
It looks Lycoming branded but identical to the Surefly, for certified it
has fixed timing :)
Cheers Werner
On 05.09.2020 15:18, eschlanser wrote:
>
> Thanks for the link.
> Is the Lycoming EIS an off-the-shelf or a clean sheet system and who makes it?
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=498152#498152
>
>
Message 3
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I asked about an easy package for creating schematics. Last night I chased down a license for Visio Pro 2019. It has a generous set of symbols and has a lot of useful output formats (see the screen shots below). It plays well with my Office 365 set up. At $4 for the license (see https://www.ebay.com/itm/133504007620), it seems worth a try.
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PBK3
PA-12, BD-4, RV6a, gliders
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=498153#498153
Attachments:
http://forums.matronics.com//files/visio_outputs_116.png
http://forums.matronics.com//files/visio1_135.png
Message 4
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| Subject: | Re: Brownout Step Up Converter |
Dynon Skyview will operate down to 6V for ten seconds with no backup battery. I
wonder how it is done and if we can learn something there.
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John Bright, RV-6A, at FWF, O-360
Z-101 single batt dual alt SDS EM-5-F.
john_s_bright@yahoo.com, Newport News, Va
https://drive.google.com/drive/folders/1u6GeZo6pmBWsKykLNVQMvu4o1VEVyP4K
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=498155#498155
Message 5
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| Subject: | Re: Revmaster 'dual' alterantors |
Bob, for some reason your post made it to me on the digest but does not show up
on the forum (as far as I can find). You posted it just before Joe on Friday
morning (I think). It begins as follows:
>> >>So take a peek at the simplified proposal diagram.
>> >>Hook the two Revmaster windings in series-aiding
>> >>and bring out the center-tap. Connect in full wave
>> >>configuration with only TWO junction rectifiers.
>
>>I like the approach and two questions come to mind:
>> How well the current will be equally divided by the two windings?
>> This is half wave rectification, right?
> No, full wave . . . the current doesn't
> NEED to be exactly shared . . . each winding
> conduct on 1/2 cycle of the time independently
> of each other. Unlike the legacy, single winding
> PMA and bridge rectifier approach, this
> configuration splits the two halves onto
> separate windings . . . but it's still
> full wave rectification
OK, I've convinced myself that the OEM design made use of 1/2 wave rectification.
Unless I'm wrong on this, running both sides with the OEM rectifiers (which
is discouraged) would have the same current (total) heat generation as this
very elegant center tap as you've shown.
The other issue is heat from the engine. I have to wonder if the real culprit
is not the windings at all but the proximity of the PMAs to the crankcase heat.
If we consider the report on the Onex where both sides failed (burned) when only
one was operating, perhaps it is the engine heat and inability to reject that,
along with the PMAs internal heating that conspire against us.
Not to throw another apple into the barrel but can we effectively add a blast tube
to the environment around the PMAs?
As far as I can see, there is one tiny little inlet hole for ventilation from above
the engine into the PMA area. This hole is mostly covered by the flywheel.
Not much of any opportunity to reject heat other than conduction through the
surface of the casting at the back of the engine.
Dan Theis
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Scratch building Sonex #1362
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http://forums.matronics.com/viewtopic.php?p=498156#498156
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