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HelicopterMain Discussion › New Super Capacitors
08-07-2017 09:15 PM  14 days agoPost 1
AirWolfRC

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08-08-2017 12:57 AM  14 days agoPost 2
EEngineer

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TX

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-40 deg. C?

Yeah, right....

Logo 600SXs, 700XX, 800XX

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08-08-2017 08:24 PM  13 days agoPost 3
Andy from Sandy

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Considering mil spec capacitors have a temperature range of -55 to +125 these are quite conservative.

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08-08-2017 08:50 PM  13 days agoPost 4
EEngineer

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TX

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Considering that no electrolytic cap has that temp. range....

Now, a tantalum or ceramic....well, that's a different widget...

I didn't see any test data at -40 deg. C....did you?

Did see that it's ESR can vary by 4x the stated value.

And the capacitance by 30%....

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08-08-2017 09:02 PM  13 days agoPost 5
Andy from Sandy

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Is this an electrolytic capacitor?

http://www.mouser.com/ds/2/88/057-192.pdf

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08-08-2017 09:07 PM  13 days agoPost 6
EEngineer

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TX

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Electrolytic yes, mil spec no....as you mentioned, mil temp. range is -55 to +125 C...

It says "commercial equivalent"....whatever that means..

Marketing jargon is what it is....

We always called "Cornell Dubilier"....Cornell Dubious...

The problem with electrolytic caps is that below freezing, the electrolyte doesn't work correctly.

Notice it has no test data below freezing.....

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08-08-2017 09:56 PM  13 days agoPost 7
AirWolfRC

rrProfessor

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If you think your comments are actually worth something, why don't you call Illinois Capacitor ? Their phone number is right on the spec sheet.

I suspect they know a thing or two more than you do.

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08-08-2017 10:27 PM  13 days agoPost 8
EEngineer

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TX

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I'll leave it to you to make the call, AW....

You posted the link which had the specs....I only read what you posted in your link. I didn't generate the specs, they did.

Would think they would have tested it below freezing and have specs on that.

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08-08-2017 10:33 PM  13 days agoPost 9
RM3

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Killeen, Texas - USA

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Is that a problem?
obviously... it is.

Ive read alot about super caps and the new "Ultra Caps"...

eventually they are going to look just like Lipos... BUT with a very fast charge rate... especially with the advancements in graphene technology. Nice and all but I still like my engines...

showing a preference will only get you into trouble, 90% of everything is crap...

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08-08-2017 10:41 PM  13 days agoPost 10
AirWolfRC

rrProfessor

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A couple of curious things on their spec sheet,
electrical characteristics after 1000 hrs of use
electrical characteristics after 1000 hrs on the shelf
500,000 test cycles at 60sec per cycle = 8,333 hours

The capacitance change is the same after 1000 hours of use and 8,333 hours of test cycling ? ?
(capacitance change <30% of initially measured values)

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08-08-2017 10:46 PM  13 days agoPost 11
EEngineer

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TX

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That's what the specs claim....<30% change of capacitance...

It's an Obama cap....

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