Hi-power nanotube wire
1/6 the weight, corrosion-resistant. Rice University.
http://www.kurzweilai.net/ultra-light-nanocables-may-replace-copper-for-...
Cars and transmission towers and planes and offshore oil rigs are suggested applications.
VolkerP | September 15, 2011
funny that space travel is missing from the list. It is the premium field for weight reductions using insanely pricey materials.
Another benefit I see is little resistance increase with temperature. This means you can overheat these cables for a (very) short period of time with a high current - let's say for 3,7 seconds?
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Noticed a patent that is being considered for sailing vessels: 20120286513. It is being applied for but I believe another one has already been approved for...