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steve(at)tomasara.com
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 Posted: Sun Oct 29, 2017 3:54 pm Post subject: Alt. drop out while pulling Gs... |
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Greetings all,
Here's an odd one... My O235 powered Longeze use a vintage externally regulated 40A Toyota alternator paired with a no-name after-market "Ford-style" regulator. (see attached pic):
I've got it wired in the (Aeroelectric) traditional way with an overvoltage crowbar (visible in the picture) and a 5A breaker on the field winding. Undervoltage is redundantly apparent via a traditional Westach voltmeter and A Perihilion low-voltage indicator. All the wiring (which I have yet to re-inspect) has lots of strain-relief, all PIDG connectors etc.
Nonetheless, today I observed that when I pull high positive G's, the alternator drops out (low-voltage light illuminates, voltmeter shows ~12.5 volts or so) but no excess current was observed on load meter (I didn't *specifically* check it so I might have missed the details here... But it is located adjacent to the voltmeter so I *might* have noticed something odd if present, or I might not have - remember, I was in the middle of pulling Gs...). I've been flying it, as wired for years but haven't done much pulling Gs before so I don't know if this behavior is new or not...
Of course I'll be double checking connections etc. but I'm wondering if it's possible that the ford-style regulator I installed could be G sensitive? I can't image it but thought I would ask...
Thanks for any insights!
Steve Stearns
Longeze N45FC
Boulder/Longmont CO
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nuckolls.bob(at)aeroelect
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| Posted: Sun Oct 29, 2017 4:19 pm Post subject: Alt. drop out while pulling Gs... |
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At 06:52 PM 10/29/2017, you wrote:
| Quote: | Greetings all,
Here's an odd one... My O235 powered Longeze use a vintage externally regulated 40A Toyota alternator paired with a no-name after-market "Ford-style" regulator. (see attached pic):
I've got it wired in the (Aeroelectric) traditional way with an overvoltage crowbar (visible in the picture) and a 5A breaker on the field winding. Undervoltage is redundantly apparent via a traditional Westach voltmeter and A Perihilion low-voltage indicator. All the wiring (which I have yet to re-inspect) has lots of strain-relief, all PIDG connectors etc.
Nonetheless, today I observed that when I pull high positive G's, the alternator drops out (low-voltage light illuminates, voltmeter shows ~12.5 volts or so) but no excess current was observed on load meter (I didn't *specifically* check it so I might have missed the details here... But it is located adjacent to the voltmeter so I *might* have noticed something odd if present, or I might not have - remember, I was in the middle of pulling Gs...). I've been flying it, as wired for years but haven't done much pulling Gs before so I don't know if this behavior is new or not...
Of course I'll be double checking connections etc. but I'm wondering if it's possible that the ford-style regulator I installed could be G sensitive? I can't image it but thought I would ask... |
No, but alternator brushes are. They are held
against a slip ring with springs that don't
want to be too aggressive . . . they're relatively
soft carbon on soft copper.
If you could monitor output voltage from the
regulator's field terminal while duplicating
the event, I suspect you'll see regulator
voltage go UP while alternator output is going
down. I.e. the regulator may be screaming
at an alternator that isn't listening.
Bob . . .
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steve(at)tomasara.com
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| Posted: Mon Oct 30, 2017 6:54 am Post subject: Alt. drop out while pulling Gs... |
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| Quote: | >Of course I'll be double checking connections
>etc. but I'm wondering if it's possible that the
>ford-style regulator I installed could be G
>sensitive? I can't image it but thought I would ask...
|
 >No, but alternator brushes are. They are held
 >against a slip ring with springs that don't
 >want to be too aggressive . . . they're relatively
 >soft carbon on soft copper.
 >If you could monitor output voltage from the
 >regulator's field terminal...
Didn't expect that... This sounds like a good excuse for me to buy an inexpensive stand-alone multi-channel data logger. I assumed there would be many to choose from but a quick look on Amazon didn't turn one up.
Anyone have any recommendations?
Thanks,
Steve Stearns
Longeze N45FC
Boulder/Longmont CO
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user9253
Joined: 28 Mar 2008
Posts: 1927
Location: Riley TWP Michigan
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nuckolls.bob(at)aeroelect
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| Posted: Mon Oct 30, 2017 9:18 am Post subject: Alt. drop out while pulling Gs... |
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| Quote: | Â >No, but alternator brushes are. They are held
 >against a slip ring with springs that don't
 >want to be too aggressive . . . they're relatively
 >soft carbon on soft copper.
 >If you could monitor output voltage from the
 >regulator's field terminal...
Didn't expect that... This sounds like a good excuse for me to buy an inexpensive stand-alone multi-channel data logger. I assumed there would be many to choose from but a quick look on Amazon didn't turn one up.
Anyone have any recommendations? |
Lots of products for monitoring temperature
and shipping shocks . . . I've not seen any
that would be very useful to the work we do.
That's what prompted this project a couple
of years ago now 99% ready for beta testing.
Hmmmm . . . Paul and I are putting the final
touches on the OBAM aircraft friendly data
logger I mentioned a few days ago. Maybe
you could be the 'beta test' project.
[img]cid:.0[/img]
[img]cid:.1[/img]
Here's what the proof of concept assembly
looks like. A very rudimentary configuration
would suffice to get a look-see on significant
parameters of your difficulty.
I am going to install one on my pickup truck
and just leave it in place to gather a constellation
of data . . . but no reason we couldn't use
it to get a peek at your airplane.
Bob . . .
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n233ee(at)gmail.com
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| Posted: Mon Oct 30, 2017 11:45 am Post subject: Alt. drop out while pulling Gs... |
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I would like to have a couple of stand alone data loggers. Do not need another ‘display’ or have room for one. Earl
[quote] On Oct 30, 2017, at 12:17 PM, Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com> wrote:
> Â >No, but alternator brushes are. They are held
> Â >against a slip ring with springs that don't
> Â >want to be too aggressive . . . they're relatively
> Â >soft carbon on soft copper.
>
> Â >If you could monitor output voltage from the
> Â >regulator's field terminal...
>
> Didn't expect that... This sounds like a good excuse for me to buy an inexpensive stand-alone multi-channel data logger. I assumed there would be many to choose from but a quick look on Amazon didn't turn one up
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steve(at)tomasara.com
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| Posted: Tue Oct 31, 2017 5:54 am Post subject: Alt. drop out while pulling Gs... |
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 Bob said: Hmmmm . . . Paul and I are putting the final  touches on the OBAM aircraft friendly data  logger I mentioned a few days ago. Maybe  you could be the 'beta test' project.
I was thinking maybe a four channel "Hobo". Btw,: I get the digest version of the forum so I can not look at attachments... Nonetheless, I'm available to alpha or beta a new logger. I hadn't been following that thread so I'll have to go back and read the background. Consider me an experienced tester as I've done lots of development and have a lab etc..Â
Steve Stearns
Longeze N45FC
Boulder/Longmont CO
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