Mr. Shawyers who built the "Emdrive" releases the design and someone else builds an identical copy and tries to make it work. The new drive either works or it doesn't.

"Now look back at Shawyer’s Figure 2.4. He has Fs1 and Fs2 pointing perpendicular to the axial direction, not perpendicular to the cone’s walls.
His arrows are wrong.
This is the fundamental blunder that renders Shawyer’s paper meaningless."

But the point is that whatever arrows he skipped in this figure Mr. Swayer claimed that instead "he had constructed a prototype that produced 88 millinewtons of forces while using only 700 watts of power."

So it is rediculous to refer to an imperfect scetch when there is an experimental evidence. But how does Dr. Costella demonstrate that the result of the experiment is wrong? The point is that he is too lazy to proof that Shawyers experiment is of no meaning. He just refers to a missing arrow in a scetch. This is what he writes:

"I started having waking nightmares about what would be needed to disprove him: complicated mathematical solutions of horrendous equations; complex computer simulations of conical waveguides; … I shuddered at what I had, mentally, committed myself to. But just as the computer-ised woman in the train’s roof told me that we were approaching Seaford Station, the penny dropped. It was something that I could have explained to my Year 11 students when I was a still a teacher."

And thus he builds his critics on a figure which is of no meaning for Mr. Shawyers experimental results.

I don't know what is wrong with Mr. Swayer's engine. But I know that Dr. Costella does miss the point.

Conservation of Momentum and of energy both do not need an advocatus diaboli to speak for them against the mass who shouts "she shall burn" because they cannot be disregarded. They are not negotiable (only gods can break the laws of nature… anyone?)

But on the other hand the scientific method is for sure not fulfilled by the methods which Mr. Costella has chosen to refute Mr. Shawyer.

Look at what Mr. Costella did.

http://www.assassinationscience.com/johncostella/shawyerfraud.pdf

The abstract of his article starts with a prejudice:

"Abstract
It is well known that Roger Shawyer’s ‘electromagnetic relativity drive’ violates the law of con-servation of momentum."

Wow!

In the very beginning Mr. Costella claims that if you do not already share a pre!judice, then shame on you. No, you don't learn anything here if you do not already know beforehand! That is not the way things start if you expect to LEARN something trustfully.

Q. Is the thrust produced by the EmDrive a reactionless force?
A. No, the thrust is the result of the reaction between the end plates of the waveguide and the Electromagnetic wave propagated within it.

"In a sense, this concept is the reverse of the flashlight on a train thought experiment. Instead of increasing the frequency of the light shining from the front of the train, the microwaves moving around in the chamber must become red-shifted as they give up their momentum.

As to the issue with the vector addition, any vector can, of course, be expressed as the summation of two or more other vectors. Has anyone bothered to see if the author just skipped the step of telling his readers that he broke down the components of the vector that hits the sloping wall into their x and y components? It seems to me that he's claiming that over time the microwaves are converted from a random distribution of x and y components into being mostly x (the direction of travel) and very little y (which cancel each other out).

In a sense, this concept is the reverse of the flashlight on a train thought experiment. Instead of increasing the frequency of the light shining from the front of the train, the microwaves moving around in the chamber must become red-shifted as the give up their momentum. If, that is, this device actually functions.

… so the microwaves simply bounced back and forth forever inside, becoming more and more intense as the solar arrays power it up, never being absorbed and re-released as heat?

So the inner surface is a perfect mirror including the microwave emitting device itself?

If you say yes in support of the device, then you must concede there is no thrust because the vector sum of all the bouncing microwaves in the closed device will always be zero.

If you say no to the infinite perpetual internal reflections of the microwaves, in defiance of the device, then at the very least the device emits heat … a detectable emission that contradicts the author.

However If the heat is all coming out the back of the engine then maybe you'll get some thrust in a manner similar to a solar sail … but NOT by the erroneous mechanism the scamming author is promoting.

This scam idea has been around for decades, just waiting for ignorant people in positions of power to fund it. File this crap in the same category as the 'water fueled' car scams.

You would think the guy who runs this blog would see through it. He is a scientist isn't he?

Perhaps I will visit this website less often now, the credibility of this website is damaged.

Entropy: Nothing from nothing; and everything to nothing eventually.
New ideas are good, and great if they are substantial.

Face facts, we haven't even nearly discovered everything about this universe, and i'd say we haven't even learned 1% of what there is to know.

If it weren't for people stepping outside the box, we'd probably still be worshipping the sun.

Finally: Is it possible to calculate (and work with) observing a system from two different frames of reference simultaneously?
A: I can't see how, I lack either the knowledge or the imagination
but…
IF it is possible, then the Thing CAN work.

This is a genuine mind twister. I wish I could just write it off as a hoax and get some sleep… but somehow I can't. It's not as obvious a hoax as any of the web conspiracies…. IF it is a hoax at all. I cannot get rid of the feeling that this could be genuine – not exactly spectacular, producing many kilonewtons but it could possibly work….. IF I can postulate observing from two frames of reference all at once…

Side bet: the Chinese Polytechnical whatever will fake their results to avoid embarassment, but will make an error that reveals their subterfuge.