EM Drive

Point out news stories, on the net or in mainstream media, related to polywell fusion.

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Betruger
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Re: EM Drive

Postby Betruger » Sun Oct 05, 2014 3:42 pm


tokamac
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Re: EM Drive

Postby tokamac » Wed Oct 22, 2014 8:47 pm

EmDrive inventor Roger Shawyer gave a presentation at conference in Toronto, 3 October 2014:


There are interesting details for a new asymmetric tapered cavity, which is no more a frustum and has several enhancements:
- Cylindrical sector
- Superconducting YBCO cavity with internal liquid hydrogen coolant
- Piezoelectric compensation against cavity deformation
- Vacuum frame made of alloys

Image

But nothing really new, notably no test results of such a cavity for now.

birchoff
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Re: EM Drive

Postby birchoff » Wed Oct 22, 2014 11:33 pm

I was looking forward to this. Got caught up with work so didnt check out shawyers website for a bit.

That said, it is exactly as I suspected. Not much in the way of anything interesting. I was hoping for some test results or something. From my skim of this it looks like a more "rigorous" (using that term VERY VERY loosely) version of the mission specs he has previously detailed.

Unfortunately according to the IAC site it looks like this was an oral presentation so this is just the deck from the oral presentation. Would be nice to know what he said and what questions were asked during the presentation.

RERT
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Re: EM Drive

Postby RERT » Thu Oct 23, 2014 7:37 am

I agree, except for the early slide which mentioned 'CANNAE Superconducting' test results this year at about 900 mN/kW, a much bigger number than I recalled.

tokamac
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Re: EM Drive

Postby tokamac » Sat Oct 25, 2014 8:15 pm


RERT
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Re: EM Drive

Postby RERT » Mon Oct 27, 2014 6:56 pm

Thanks for the pointer, I hadn't seen that. I had in mind numbers of 10's of mN, so don't seem to have done the arithmetic before I filed the number in my head.

stefanbanev
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Re: EM Drive

Postby stefanbanev » Fri Dec 19, 2014 1:46 am

I'm wandering what the advantage of propellant free drive over traditional Newtonian rocketry... a single proton can be accelerated asymptotically close to speed of light as soon as energy supply provides sufficient energy... besides, a single relativistic proton may have mass of rocket once it close enough to speed of light; no need to challenge momentum conservation and still to be able to transfer any amount of electric energy to kinetic energy of rocket with virtually no propellant exhaust... apparently I miss something... may some one explain what I miss here...

RERT
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Re: EM Drive

Postby RERT » Fri Dec 19, 2014 3:00 pm

Its an awful while since I did this class, but think you get to peak ratio of momentum to energy by ejecting momentum as photons at the speed of light. Unfortunately you still need a stupendous amount of energy (E=pc?) to get any sensible mass anywhere fast....

JoeP
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Re: EM Drive

Postby JoeP » Fri Dec 19, 2014 3:08 pm


stefanbanev
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Re: EM Drive

Postby stefanbanev » Mon Jan 05, 2015 3:41 am


Jboily
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Re: EM Drive

Postby Jboily » Sun Jan 11, 2015 5:46 am


Aero
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Re: EM Drive

Postby Aero » Mon Jan 12, 2015 9:49 pm

Aero

GIThruster
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Re: EM Drive

Postby GIThruster » Mon Jan 12, 2015 11:29 pm

How does the evanescent wave explanation answer objections that this violates conservation?
"Courage is not just a virtue, but the form of every virtue at the testing point." C. S. Lewis

Aero
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Re: EM Drive

Postby Aero » Tue Jan 13, 2015 2:10 am

Aero

kunkmiester
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Re: EM Drive

Postby kunkmiester » Tue Jan 13, 2015 7:50 am

Evil is evil, no matter how small


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