Matronics Email Lists

I can imagine the failed battery being depleted and the aircraft being started on the other battery followed by becoming airborne promptly and the main alternator putting a lot of energy into the depl ...

I got a prompt response from Alan Kohler of Odyssey Battery.

Hello,

That is an EnerSys / Odyssey Battery

All Odyssey are AGM Batteries

This one had a severe internal issue, and severe over ...

Is that for sure an odyssey? I haven't ever seen an odyssey that looked like that, and I don't think they even have that big white sticker on them...
Tim

Thanks Tim,

I sent the photo to Odys ...

In 2019 there was a homebuilt tractor configuration two-place SBS aircraft with an EFI system that had an off-field landing. Nothing got bent, nobody got hurt, failed battery replaced, AC took off fro ...

My wire notes are in the footnote of this document: https://docs.google.com/document/d/1s0xBEMmMzSyXW6S1vXLYCvqcWpzj2znVb23ZVKWSLfI/edit?usp=drivesdk

FYI Bob has some thoughts on Lightspeed EI power wiring.

https://docs.google.com/document/d/1j8g0Jw4tWHRNQcJOlmlmixCv2Oz16MrZXvuxcTfEZ6M/edit?usp=share_link

I have updated my Primary Power System diagram.
Changes made:
* Removed two shunts and replaced with one hall effect sensor.
* Moved stdby alt field feed wire from avionics/essential bus to hot b ...

... I added a TCW Intelligent Power Stabilizer instead to deal with any voltage sag during starter operation...

AFAIK GAD 27 does this.

… Can you maybe use a jpg attachment instead of pdf? That way we could see the image of the drawing without having to download & save it to our computers each time.

I’m happy with PDFs and ...

I have to wonder what Bob and others think about this test Dan Horton of VAF did re ATO “regular size” blade fuses in series.

The relevant text is below the photo.

https://vansairforce.net/ ...

-->
Here's a couple of pieces I wrote a few years back . . .

In the link above Bob speaks of his rule #2 of his system reliability list, here are the others three. https://docs.google.c ...

Any chance of a future episode switching the “acres of breakers” for fuses? (except for alternator fields with crowbar OV protection) Would make the physical implementation easier and save panel s ...

BTW, what is the rating of your alternator?
Relevant only to the extent of sizing b-lead
wire conductor size to limit voltage drop
to design goals . . . generally on the order
...

... I will bench test the link to understand more of how the link reacts. Would there be any downside to attaching the 6” link at the B terminal of the pri alternator , rather than at the terminal ...

FLW 6" long and 4 awg smaller than the B lead, PICO brand is common; available from 10 to 20 awg.

Is the main alternator 60A... if so I would go with 6 awg B lead.

You could crimp multiple wires into a larger terminal. If loose in terminal, fill with extra strands. BTW this method is Nuckolls approved and removes one FMEA failure mode - if nut loose on stud thos ...

Re "Primary Power System.pdf" RV-14A N144EF rev in work 02/04/2023

I have a number of suggestions that I can peck away at. I’ll start with the battery bus to make it meet FAR 23.1361:
...

And note that Bob Nuckolls teaches us to put the flyback suppression diode across the contactor or relay's coil, not the switch to the coil. I mention this because the OP's schematic from 1993 shows t ...

... 1) Re: Shut off power close to the source. It does not meet that objective and I see that a relay would... My memory says that Bob in the past said 5A was the threshold..."

Ref FAR 23.13 ...

Re schematic Batteries, Alternator, Starter & Power Distribution rev v1.1

I imagine panel switches are more convenient than getting into the EFIS menu to control feeds from the VP-X.

You don ...