Given what I've researched today (linked to earlier) I'm predicting it is easier to accelerate a conductive cone (pointy end first) than a sphere under very high energy conditions and acceleration. I think that under normal every day conditions the effect would be insignificant. Both internal and external boundary conditions are important to emdrive. Seems logical to me that the Nasa test article would produce more thrust while rotated pointy end up than down due to acceleration of gravity, barely. I need help formalizing this. Prove me wrong.
Already did. In earlier post. I suggested PVDF is better.
Quote from: Mulletron on 10/04/2014 01:23 amGiven what I've researched today (linked to earlier) I'm predicting it is easier to accelerate a conductive cone (pointy end first) than a sphere under very high energy conditions and acceleration. I think that under normal every day conditions the effect would be insignificant. Both internal and external boundary conditions are important to emdrive. Seems logical to me that the Nasa test article would produce more thrust while rotated pointy end up than down due to acceleration of gravity, barely. I need help formalizing this. Prove me wrong.Another test:the Cannae drive is shaped like a pillbox (see picture). It is symmetric except for the dielectric resonator being installed in the long pipe side.Can you predict thrust for the Cannae drive?
Quote from: Mulletron on 10/04/2014 01:44 amAlready did. In earlier post. I suggested PVDF is better.Here:http://forum.nasaspaceflight.com/index.php?topic=29276.msg1243723#msg1243723and here:http://forum.nasaspaceflight.com/index.php?topic=29276.msg1243735#msg1243735
Quote from: Rodal on 10/04/2014 01:52 amQuote from: Mulletron on 10/04/2014 01:44 amAlready did. In earlier post. I suggested PVDF is better.Here:http://forum.nasaspaceflight.com/index.php?topic=29276.msg1243723#msg1243723and here:http://forum.nasaspaceflight.com/index.php?topic=29276.msg1243735#msg1243735You mean Polyvinylidene difluoride (it is yet another thermoplastic fluoropolymer).Why do you like it? Because of its high piezoelectric effect compared to PTFE ? It has a negative d33 value (it will compress instead of expand when exposed to an electric field). It is anisotropic (crystalline)Or because of its heat resistance? Or something else?Is there a phase you prefer? alpha , beta , or gamma phases ?
Quote from: Rodal on 10/04/2014 02:02 amQuote from: Rodal on 10/04/2014 01:52 amQuote from: Mulletron on 10/04/2014 01:44 amAlready did. In earlier post. I suggested PVDF is better.Here:http://forum.nasaspaceflight.com/index.php?topic=29276.msg1243723#msg1243723and here:http://forum.nasaspaceflight.com/index.php?topic=29276.msg1243735#msg1243735You mean Polyvinylidene difluoride (it is yet another thermoplastic fluoropolymer).Why do you like it? Because of its high piezoelectric effect compared to PTFE ? It has a negative d33 value (it will compress instead of expand when exposed to an electric field). It is anisotropic (crystalline)Or because of its heat resistance? Or something else?Is there a phase you prefer? alpha , beta , or gamma phases ?I was wanting to use large 1x2 meter sheets layered together to store energy for electric cars or something. I abandoned it when I learned that it has a low Curie temperature. But it is highly polarizable and ferroelectric. I was also trying to tie it in with Abraham-Minkowski.
Interesting, but how about energy from other universes?
Gravitation hasn't been shown to communicate outside its local spacetime curvature or even proven it is field theoretic. No gravity waves. Einstein said it was local curvature in spacetime. No ripples to communicate via in spacetime have been found. Find one gravity wave and gravitational Inertia will work. Even non locally across the cosmos because phase velocities are superluminal. Gravity is a how not a why. I'm surprised Feynman invented mathematical time travel to shoehorn that view of Inertia. This is fun.Also wmap has shown a lumpy cosmos with a dipole anisotropy. Here at home we are dominated by the mass of a planet moon and star and a supermassive blackhole, none of which contribute to any inertial dipole moments. I invited him. I hope he gets over here. His credentials and willingness to communicate leveraging the Internet are awesome.
Quote from: frobnicat on 10/04/2014 12:09 am...Getting unlimited energy source by just radiating away tons of negative mass as debt never to be paid. This is brilliant ! That should easily find some financial backer.Or another way to show to people that negative mass is not likely to exist in reality.We can still enjoy it virtually in science-fiction plots
...Getting unlimited energy source by just radiating away tons of negative mass as debt never to be paid. This is brilliant ! That should easily find some financial backer.
Quote from: Rodal on 10/04/2014 12:18 amQuote from: frobnicat on 10/04/2014 12:09 am...Getting unlimited energy source by just radiating away tons of negative mass as debt never to be paid. This is brilliant ! That should easily find some financial backer.Or another way to show to people that negative mass is not likely to exist in reality.We can still enjoy it virtually in science-fiction plots Aren't negative mass what is called tachyons and always moving >c, or am I mixing two different concepts ?Mmm, that could allow for the existence of negative mass but preventing divergent instabilities (forever chasing...) since both couldn't interfere for long time...
Silly question and may sound of topic but I assure you it is relevant. Are causality and information conjugate variable pairs?
Took a while to find this again. http://www.gregegan.net/SCIENCE/Cavity/Cavity.html
Quote from: Mulletron on 10/04/2014 11:53 amSilly question and may sound of topic but I assure you it is relevant. Are causality and information conjugate variable pairs?They are very much related as I think you know. Time travel to the past poses great paradoxes both with causality (killing your grandfather paradox) and information (sending present information to the past). Also both causality and information can be expressed in terms of entropy of course.And the reason you asked is ?................
Quote from: Mulletron on 10/04/2014 03:35 amTook a while to find this again. http://www.gregegan.net/SCIENCE/Cavity/Cavity.htmlVERY nice and exhaustively done ! Have you seen the same sort of thing for dielectric resonators ?