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.