Maxwell Ultra-Cap's/Lithium cells hybrid pack - Page 4 - RC-Monster Forums

BrianG · 12.04.2006, 06:02 PM

Yeah, or a high-output alternator and a second battery. :(

I was actually looking at regulating the lights to a solid 12v even though they won't be quite as bright. That way, they won't dim when the electrical system goes from ~14.4v to ~12v when the bass hits. But a linear regulator would be large and toasty.

zeropointbug · 12.04.2006, 08:55 PM

Brian, i have been thinking. You know when you said all that matters is the average power for a ultra cap... that still didn't sit right with me. So i was thinking is it the term 'mean', the mathematical term, it's kind of like average. Only in this app, I would be higher than average power output (from battery).

Do you know what i mean when i say the 'mean' discharge, not the average discharge? It would be a little higher than average.

I am not totally sure if thats the term, so if you think you know what im talking about, if you could help out?

BrianG · 12.04.2006, 09:13 PM

Well, IIRC, "mean" is the physical center value of a dataset, whereas "average" is the sum of the values of the dataset divided by the count of numbers in the dataset. If this is correct (and please let me know it it's not), what do you mean (no pun intended :))?

BTW: Where did I say that? I'm trying to think what I might have been talking about...

zeropointbug · 12.04.2006, 10:50 PM

(no pun intended) lol i was going to say that :005:

I guess it's not mean, it must be called something else. It will come to me, some like RMS, but not...

aqwut · 12.05.2006, 03:10 PM

woah... 1 farad can be that small cap... that is cool

BrianG · 12.05.2006, 04:12 PM

Quote:

Originally Posted by aqwut

woah... 1 farad can be that small cap... that is cool

Yeah, it is quite small. Because it is rated for such a low voltage, the plates can be very close together; and because the current rating is so low, the thickness of the plates can be ultra-thin.

I think that if I tried to use these, they would heat up and expand/pop before too long. Plus, if you look at the ESR, it is kinda high compared to caops designed for high currents...

zeropointbug · 12.05.2006, 09:45 PM

Have you ever had a cap blow on you?! I have, it's not fun, reverse polarity... the end vent opened right up, filled a large portion of my room with steam from the electrolyte. Very stinky :020: :036:

Ya, the new Super-Ubar-Ultra Caps from that group from MIT uses Nano carbon tubes like hair that drastically increase capacity and current. They claim 60Wh/kg gravimetric density. EStor, another company claim i think ~120-150 Wh/kg, IMPRESSIVE. For a capacitor.

BrianG · 12.05.2006, 09:57 PM

Oh yes, I've had a couple pop. One was because of too high voltage - I could actually see it expand until it vented. It happened before I could shut the power off. The other was from reverse polarity. That was a 1,000uF 50v cap in a power supply. Yes, they do stink.

zeropointbug · 12.06.2006, 09:52 AM

BTW, I now going to give in and get the DX 2 Spektrum Radio. I don't really like running out of room after one small town block. How are they for range?

glassdoctor · 12.06.2006, 11:38 AM

I have never had a problem with range with any FM or my Spektrum system... you lose perspective on the car before you run out of range as Brian said.

But, long range is not the Spektrum's strong suit actually. A good regular FM system should have better range. That's why the plane guys are not converting to DSM. That's what i am told by the plane guys at the LHS, when I asked why they aren't using it.

Serum · 12.06.2006, 12:44 PM

I like the momadio! it's got a total different looks than the others.

natrix · 12.06.2006, 05:13 PM

Quote:

Originally Posted by Serum

I like the momadio! it's got a total different looks than the others.

Yah it does, it looks really cheap! :005:

I don't doubt its high performance though. A few of my buddies have switched from spektrum to nomadio and are loving it.

neweuser · 12.06.2006, 05:13 PM

Quote:

Originally Posted by Serum

I like the momadio! it's got a total different looks than the others.

I like the fact that the Nomadio has the sensored equipment as well. You can check the temps and voltage...etc...

BrianG · 12.06.2006, 05:21 PM

I thought about getting a Nomadio radio and keeping the Spektrum receivers for the size. Really, the only plus for the Nomadio for me is the ability to store more models...

natrix · 12.06.2006, 05:25 PM

If you already have spektrum, just add the telemetry package if you want to keep track of voltage and temps. Or get the eagle tree recorders. I'm leaning towards either getting the USB car data recorder or the micro logger.

http://www.eagletreesystems.com/Car/car.html

I love my 3PK with spektrum too much to switch over to the Nomadio set-up.