[Gordonjcp]

Isn't it a problem that carbon is mostly one of the things you make nearly every resistor out of, instead of wires?

[chaxor]

Armchair swcnts are ballistic conductors. It matters quite a lot how that carbon is oriented.

[Gordonjcp]

How well do they conduct? At the moment aluminium is kind of the "sweet spot" between weight, cost, and conductivity.

[chaxor]

Ballistic conduction means 'perfect' conduction in a sense. There's no resistance. It's only for armchair swcnts though. Other metallic swcnts are also great conductors, but if you separate out the chiralities (semiconductors, etc) you might as well separate to just armchairs.