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originally posted by: Mary Rose
originally posted by: Nochzwei
blp claims restructuring of hydrogen atom and most skeptics are skeptical about this.
Restructuring as in collapse?
I give this pig of an economy less than a year before it keels over and dies. You have NO idea how close to the brink we are. Russian diplomats are talking with China every day about dumping the dollar. National currencies are only as valuable as the amount of tradable goods a nation produces.
We produce virtually NOTHING here, which means our currency should be worth next to nothing.
We produce oil, bombs, tanks, and crappy software that lets us spy on everyone. Not good. This pig is coming down.
originally posted by: Rob48
a reply to: Variable
There's a special kind of irony here: he complains about the US economy not producing anything tangible and yet he's constantly touting people like BlackLight Power and Blue Eagle Refiners, who don't produce anything at all except empty promises and investment scams!
originally posted by: EasyPleaseMe
Wired have answered 10 of the most common questions regarding the reactionless drive here
While wired is hardly a respected scientific institution, the answered are reasonable enough.
originally posted by: Harte
I think you posted the wrong link. Here.
Harte
originally posted by: EasyPleaseMe
originally posted by: Harte
I think you posted the wrong link. Here.
Harte
Thanks - not sure how that happened as I tested the link. Shame I didn't read the text properly though
However the link I posted is to a NASA test of a Mills type cell which produced excess energy unexplained by the usual suspects. Whilst BLP haven't made good on their promises, at least there appears to be some effect to base their claims on.
originally posted by: EasyPleaseMe
originally posted by: Harte
I think you posted the wrong link. Here.
Harte
Thanks - not sure how that happened as I tested the link. Shame I didn't read the text properly though
However the link I posted is to a NASA test of a Mills type cell which produced excess energy unexplained by the usual suspects. Whilst BLP haven't made good on their promises, at least there appears to be some effect to base their claims on.
originally posted by: stormbringer1701
if they were working with a more complex atom i might be tempted to say it might be nucleonic isomers. but i don't know if that applies to a single proton or how long a hydrogen proton can maintain a isomeric excited state. we really can't figure out how to mess with nucleonic isomeres very well. we thought we could but we turned out to be full of poop on the issue.
originally posted by: mbkennel
Problems with Shawyer's EMdrive theory paper.
Referencing this: Shawyer's EMdrive theory paper
The problems start with Equation (1), the Lorentz force equation: F = q(E x vB). Shawyer goes on to explain that if the group velocity of the microwave is higher at one end than the other then this changes the force balance, using this equation.
But it is inapplicable, as it's describing the force on a *moving charge*. There are not charges moving at the group velocity in the EM cavity, just free space electromagnetism which is governed by Maxwell's laws.
Also, in the figure of for 1, Shawyer says how the group velocity of EM waves is different on the one end of the tapered cavity than the other, which is fine, but the radiation pressure also depends on the flux! So even if the wide side had a higher group velocity than the narrow side, because presumably other than resistive cavity losses the usual energy conservation applies so the intensity on the narrow side is proportionally higher. (Again, same mistake in equation (6))
The description about needing to go into different relativistic frames doesn't make too much sense and isn't explained.
Maxwell's equations are already relativistic, you need not do anything. You can take a stationary frame of reference and do your computations with fields and charges just fine, with electrodynamics as Maxwell said it was.
Shawyer is incorrectly assuming that you can use a group velocity of an electromagnetic wave as if it were equivalent to a particle with mass, and then applying the special relativistic formulae for addition of velocity.
You can't do that---you just need to solve Maxwell's equations.
And finally, in a small cavity where the dimensions are of order of the wavelength (and presumably in a resonant cavity with microwaves it's like this), then the concepts of 'group velocity' is less clear, that's defined for essentially infinite propagation in one dimension (or large compared to wavelength). Inside a small cavity you just have specific solutions of time-dependent E and B fields and their forces on the walls.
And the fundamental laws of total momentum conservation (fields plus particles) is very well established.
However as the veloc it ies at each end of the waveguide are significant fractions of the speed of light , a derivation of the force difference equation invokes the difference in velocities and the refore must take account of the special theory of relativity
originally posted by: Tichy
That's the interesting point here i think. I do not understand much of all the equations and stuff tbh. But what first catched my eye within his paper was:
However as the veloc it ies at each end of the waveguide are significant fractions of the speed of light , a derivation of the force difference equation invokes the difference in velocities and the refore must take account of the special theory of relativity
I think this is the crucial part of what his theory and everything that follows is made up.
Wether his theory behind this EmDrive turns out to be correct or not it might lead into the right direction to understand the whole principle at least...if the results from these tests turn out to be correct.
Although the effect doesn't vanish for constant accelerations, even in the instantaneous rest frame, that doesn't necessarily mean that we can conserve energy and momentum locally. But that shouldn't be too surprising, for here we're dealing with an explicitly non-local interaction involving the most distant matter in the universe. When energy in the field and distant matter is taken into account, we may reasonably expect that conservation laws, instant-by-instant, aren't violated.
originally posted by: mbkennel
Made up, as in 'invented'? That was just my point.