Today's Message Index:
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1. 11:33 AM - Re: Blowing fuses on B&C BC433 alternator (Sam Hoskins)
2. 01:47 PM - Re: Video editing software (InkrGod)
Message 1
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| Subject: | Re: Blowing fuses on B&C BC433 alternator |
Thanks for replying. When I get back from the airport I'll try and send a
photo of the fuse in question.
I was able to download the engine data from my Dynon D-180 and see that
sometimes I do hit 30 amps draw. Assuming each leg would only be producing
10 amps, I would think that the fuse was a long way from it's design
failure. I am talking to B&C about this, perhaps the fues don't need to be
there at all.
Sam
On Tue, Aug 17, 2021 at 10:26 AM Robert L. Nuckolls, III <
nuckolls.bob@aeroelectric.com> wrote:
> About 50 flight hours ago, one of the fuses blew. Really blew, it
> partially melted
> the plastic coating. I couldn't really find anything wrong, but I thought
> possibly
> there was a short from one of the butt connectors to the firewall, nothing
> definitive though. Last week, 50 flight hours later, another fuse blew.
> I don't know if it was on the same leg as I didn't record it the first time
> it happened. All the wiring from the alternator to the VR seems to be 100%.
> I put my VOM on the leads and they all checked out per the B&C service
> manual. https://bandc.com/wp-content/uploads/2018/05/pmr3a-trouble.pdf
>
> It would be interesting to see the carcasses of
> the blown fuses. A design goal for fuses is to
> provide a benign mitigation to an overloaded
> wire. They are electrical 'weak links' in the
> energy conduction chain. Fuse (and breaker)
> manufacturers design and test their products
> striving to bring a potentially catastrophic
> failure to a ho-hum conclusion.
>
> If a blown fuse presents with a compromised
> enclosure then it seems likely that some condition
> other than fault current is in operation. Especially
> when two such events are widely spaced in time.
>
> Electrical connections inside holders for
> these fuses are close cousins to the fast-on
> style terminals. They depend on very high
> pressure mating to achieve gas-tight integrity
> at the interface between blade and terminal.
>
> As we've seen and studied on switch failures,
> loss of gas-tightness, over TIME, can produce
> electrically induced heating at the joint that
> contributes to a slow but ever increasing
> degradation that ends in rather spectacular
> failure of the whole assembly.
>
> This may well be what we're seeing here.
> The fuse didn't simply open up in response
> to some over-current, rather it may have
> failed in response to a precipitous heating
> event at the blade-to-terminal interface.
>
> Suggest you replace all three fuse holders
> and see how it goes.
>
>
> Bob . . .
>
> Un impeachable logic: George Carlin asked, "If black boxes
> survive crashes, why don't they make the whole airplane
> out of that stuff?"
>
Message 2
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| Subject: | Re: Video editing software |
Movavi is similar to it and quite good. I am personally using for a long time
nuckolls.bob(at)aeroelect wrote:
> To: aeroelectric-list@matronics.com
> From: "Robert L. Nuckolls, III"
> Subject: Re: OT: any PhotoShop gurus out there...now video editing software.
> Cc:
>
> At 03:41 AM 4/26/2020, you wrote:
>
> > Cant help on the Photoshop but this is distantly related I guess!
> >
> > Any recommendations on relatively simple video editing software at a fair
price?
> >
> > I have used Pinnacle Studio for many years but find it clunky and heavy on
resources.
>
> I'd been using MovieMaker for years but when
> I updated my computer my old version of MM
> wouldn't run under Win10. There are several
> offerings on the 'net which install for free
> but want some $ to get a full featured version.
>
> I found a 2016 edition that does run under
> Win10. It's intuitive and compact. You won't
> win any Oscars for editing with this package
> but it has served me well for a long time.
> It's no longer offered by Windows.
>
> You're welcome to try it
>
> https://tinyurl.com/y9r4zv4w
>
>
>
> Bob . . .
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http://forums.matronics.com/viewtopic.php?p=502872#502872
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