Shawyer Cavity Details

Hi Rambabu,

Thank you for meeting with me today and I will have a rough draft of the funding proposal to you by Friday.  I have started putting out feelers to see if I know anybody who knows someone at the Alberta Ingenuity Fund.

As I mentioned today, Shawyer has completed his superconducting cavity which he talks about in his presentation here [slideshare.com].  The Q he notes on slide 24 is 6.8×106 which is a 100x improvement over the Q 5.0×104 of the “demonstration engine” copper cavity and he is running it at 40Watts input power.  He doesn’t state what force he is getting but an August 2008 article mentions:

Roger Shawyer was beaming when I arrived at his laboratory in West Sussex; on his bench, liquid nitrogen was still boiling off, from minus195C, in an intriguing device called the EmDrive. He had just completed a pivotal three-day experiment with exactly the results he anticipated, confirming the validity of his efforts.

If Roger is happy, then it likely means that, if the force vs Q curve holds up, he should have close to a newton of force at this point.

There is also an article published just this morning on Wired that mentions the Chinese are actively reproducing Shawyer’s EMdrive and interestingly, the British have stopped funding Shawyer (not something I will mention in the proposal):

“Many have dismissed his work out of hand, and British government funding has ceased. He has had some interest from both the United States and China. Now the Chinese connection with the Northwestern Polytechnical University (NPU) in Xi’an seems to have paid off.”

The article also compares the EMdrive to Ion thrusters:

The Emdrive produces 85 mN of thrust compared to 92 for the NSTAR (that’s about one-third of an ounce), but the Emdrive only consumes a quarter of the amount of power and weighs less than 7 kilos, compared to over 30 kilos. The biggest difference is in propellant: NSTAR uses 10 grams per hour; the Emdrive uses none. As long as it has an electricity supply, the Emdrive will keep going.

The “85mN” is from his very first device with a Q of only 5900 but his demonstration engine produces an average of 214mN, which is what we will be reproducing.

Here are pictures of his superconducting setup:

And Shawyer cooling his cylinder:

And the cavity:

Note how small the cavity is by comparing it against the brick work behind it, the same brick work shown in the pictures above.  The cavity is then placed inside the tin can and surrounded by liquid nitrogen as Shawyer shows above.