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Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4061
I am building one at the moment, seems that 3D printing the cavity and using 24 GHz diodes makes for a CubeSat-sized device according to this guy
The 2nd gen (aka superconducting/metamaterial SC) system is intriguing, as it turns out palladium doped with small amounts of sulphur *might* superconduct at over 200K if the formula holds for H3S:Pd with only moderate pressure. In fact it is possible that it will work even down to 100* atmospheric pressure of H2.
Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4061
Thanks for the feedback
see (not mine, still useful!)
Added
I have established that silver printing is viable, in fact despite the earlier warnings about not using silver conductive paint an ABS or PLA cavity might work here. As long as the cavity is reasonably well made it should work as well as solid silver and be a lot cheaper and 3D printable.
EDIT: Seems that there are possible materials that superconduct without significant cooling, one is graphene-lead which behaves as if the electrons are in a 45+T field due to the extreme warping of their orbits. A lot of work suggests that under certain conditions stanene doped onto bismuth telluride (BiTe) could superconduct up to nearly 260K if the layers are oriented in the Z axis. As wavelength is quite long (ie mm) it might not need to be contiguous and superconducting islands on a silver coated ceramic just might work via the proximity effect while significantly reducing the system cost.
EDIT: Pehaps we could detect any extraterrestrials near us by listening in to their EmDrives, one suggested frequency is between 1.4 and 2 GHz as certain materials have the most weight efficient free space configuration in this range (ie a grid with a 10mm spacing) Multiple GHz might also be a good place to look ie already in the range for satellite TV between 9.8 and 11.7 GHz and have the advantage that terrestrial interference can be nulled out.
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EmDrive
