What is ?

[Dafni]

Fun conversation, indeed.

Our air is 78% Nitrogen, btw. I think they fill tires with N2 instead of air to get rid of the corrosive oxigen. (O2 makes rubber brittle)

Yeah, Helium (He) are really small molecules. It's the second element on the Periodic table, and the first (smallest) noble gas. Small molecules may penetrate polymers (such as rubber) over time. The smaller the molecule, the easier it gets through.

Another funky thought. About liquid Helium, which has a temperature at ambient pressure close to absolute zero (boiling point of Helium: 4 Kelvin)
When you would have a liquid Helium cycle on your RC ....LOL .... (liquid nitrogen would also do the trick, btw) you could take advantage of it in another way as to "just" keep your magnet cool. Keyword: Supra Conductivity !! Rene, imagine this! BL ESC producers would go nuts! 100% efficiency!

Just a thought :L: Thanks for reading. Now I have to go and take a cold shower.

[Serum]

Yeah, i heard that from my electronic nerd friend.. i was more enthusiastic about this than he was...

;)

[Nick]

Originally posted by Dafni
Fun conversation, indeed.

Our air is 78% Nitrogen, btw. I think they fill tires with N2 instead of air to get rid of the corrosive oxigen. (O2 makes rubber brittle)

Yeah, Helium (He) are really small molecules. It's the second element on the Periodic table, and the first (smallest) noble gas. Small molecules may penetrate polymers (such as rubber) over time. The smaller the molecule, the easier it gets through.

Another funky thought. About liquid Helium, which has a temperature at ambient pressure close to absolute zero (boiling point of Helium: 4 Kelvin)
When you would have a liquid Helium cycle on your RC ....LOL .... (liquid nitrogen would also do the trick, btw) you could take advantage of it in another way as to "just" keep your magnet cool. Keyword: Supra Conductivity !! Rene, imagine this! BL ESC producers would go nuts! 100% efficiency!

Just a thought :L: Thanks for reading. Now I have to go and take a cold shower.

:eek:

Would water cooling from a PC system work? Modified to fit of course.

[Serum]

No, that's not cold enough.. it needs to be at the absolute zero point..

[Nick]

How much heat can a fan take off?

[Dafni]

You wont reach absolute zero with a fan ;)

No, seriously, on my 7XL the fans save me app 20 degrees celsius. Might be more on a smaller motor.

Ahhh, supra conductors ..... :Love: Rene, do you know this nice experiment with the hovering piece of metall over a very cold magnet?

[Serum]

No Daniel, i have never seen it? how does it work?

[Dafni]

Dafnerd, the thread hijacker. I'll go down in history :D

Anyway, here we go:
You know, there are some known Supra Conductors, but they only show zero resistance at very low temps. A room-temperature supra conductor is like the Philosophers Stone to some. The discovery of such a material would push technologie to another level, and most certainly bring the lucky scientist a Nobel price.
Anyway, there are some low temp SC's available, and if you have such a pellet, cool it down with liq N2, it will hover above a piece of permanent magnet. Looks very impressiv, always makes me think of perfect bearings.

Serum, you know a bit of german. Check this link, it has pictures and videos:
http://www.hcrs.at/LIQUIDN2.HTM

If one day you'll be here in switzerland, I'll show you this experiment.

Back to topic, now. .... What was it again?? Ah, yeah, buy a Gorilla chassis!

:L:

[Serum]

LOL! well Daniel.. we both have got a hand in it...

What a 'little' cold can do...

I love experiments.. We should make a waterrocket as well.. with a BIG reservoir..

Owh, yeah.. Get a GMAXX mate..!

:D

[Dafni]

Originally posted by Serum
... but i thought they use it, because it hasn't got the large expanding air has got when it gets hotter..

Serum, if they really use Nitrogen, it would have a very similar thermal expansion as air. (the thermal expansion of compressed gases is not much. It's more significant at atmospheric pressure. With gases, thermal expansion means more pressure. There's an awefull lot of equations on this, the infamous Thermodynamics of Gases. Very interesting, but a PITA to get in your head)

[Serum]

It's N2 they use.. don't know whats the reaso for that.. And if it's possible, i heard it from 2nd hand..

[Dafni]

Like I said, I can imagine they use N2 instead of air to exclude oxygen. O2 is corrosiv, in combination with light it makes polymers brittle. May be a reason. Who knows.
Most physical properties of N2 are very similar to air.

Possible, well, it would be no problem, technically.

[Gustav]

In motorsport,the reason for using N2 instead of air in tyres is due to the H2O vapour making your pressures more inconsistent as the temps increase/decrease rather than the O2 or CO2 content.

Not so critical for a trip to the shops though.

They wouldn't worry about oxygen content making rubber brittle in a tyre with an expected life of less than an hour so that can't explain it's use in racing.(anyway, what about the air on the outside?)

It's just because of water vapour messing up your pressures i always thought

[coolhandcountry]

Does this conclude are science for the day? I feel smarter now. :) Made my brain stretch and grow. I am up to three cells now instead of two. I say go with the gmaxx. Great chassis and you can extended it at will. A few screws and you have a new longer chassis. Jmo

[Gustav]

Oh yeah,the topic.

Definately G-maxx,far more intelligent piece of design(x-brace),spares available,choice of wheel base,lighter,very strong,lots of good people swear by them,Mike sells them,etc,etc.

I'm not keen on Bombproof.