Search found 123 matches

by RERT
Mon Mar 30, 2015 3:42 pm
Forum: News
Topic: Propellantless propulsion from plain-old Special Relativity
Replies: 52
Views: 27579

Re: Propellantless propulsion from plain-old Special Relativ

Back to the root topic I'm afraid... I just read the paper - the Arxiv version. The says nothing I could spot about reaction forces, but simply does a careful calculation of the total force on two current loops in the case where the Lorentz force propagates at the speed of light. The answer (equatio...
by RERT
Thu Feb 05, 2015 10:15 pm
Forum: News
Topic: SpaceX News
Replies: 2289
Views: 681526

Re: SpaceX News

What are the implications of this for e.g. Chinese control of internet access? If the free Internet is only a fraction of a second away, upwards to a satellite, aren't they going to react badly?
by RERT
Wed Jan 28, 2015 1:25 pm
Forum: News
Topic: Lawaranceville E-Newsletter
Replies: 829
Views: 343050

Re: Lawaranceville E-Newsletter

Can anyone shed light on where they will be if they meet this schedule? Fumbling with Wikipedia suggests that their triple-product must be very interesting with even micro-second confinement times at 1 gram/cc. To say I'm uncertain about this is a massive understatement, so wiser comment appreciated...
by RERT
Fri Dec 19, 2014 3:00 pm
Forum: News
Topic: EM Drive
Replies: 710
Views: 378414

Re: EM Drive

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....
by RERT
Sun Dec 07, 2014 9:03 pm
Forum: News
Topic: Firefly News
Replies: 21
Views: 10147

Re: Firefly News

The last material news was in January when they announced an R&D relationship with the US Air Force Research Laboratory's Aerospace Systems Directorate. The EU have given them a 1M Euro contract for study into next gen space systems. Finally the UK government have announced an investment of £60M/aro...
by RERT
Fri Oct 31, 2014 8:31 pm
Forum: News
Topic: Russia developing hybrid fusion-fission reactor
Replies: 13
Views: 5528

Re: Russia developing hybrid fusion-fission reactor

I wouldn't want to argue with any of that: doing this with a large Tokamac sounds horrendous. The idea in this thread is that a neutron flux can be leveraged to higher energy output using a fissionable ?U238? 'blanket'. The question is then 'How *much* leverage?'. My answer as above is that 11:1 is ...
by RERT
Fri Oct 31, 2014 6:29 pm
Forum: News
Topic: Russia developing hybrid fusion-fission reactor
Replies: 13
Views: 5528

Re: Russia developing hybrid fusion-fission reactor

I searched with very little success last night to find out how much energy a fast-neutron/U238 fission might generate. The best I came up with was a reference to Plutonium 239 fission yielding over 200 MeV. That might be a practical to spin a turbine if the input energy was less than 60MeV. So if D-...
by RERT
Thu Oct 30, 2014 1:57 pm
Forum: News
Topic: Russia developing hybrid fusion-fission reactor
Replies: 13
Views: 5528

Re: Russia developing hybrid fusion-fission reactor

See www.globalenergycorporation.net. This is a group of ex SPAWAR researchers aiming to produce a hybrid fusion/fission reaction by using a source of energetic neutrons to cause fission in U238. They are starting from the point of view of LENR, but the principle is the same: using a source of neutro...
by RERT
Mon Oct 27, 2014 7:44 pm
Forum: News
Topic: Aviation Week on the Lockheed Skunkworks CFR
Replies: 186
Views: 106861

Re: Aviation Week on the Lockheed Skunkworks CFR

Looks like the plasma is flowing into the supports for the magnets. Wouldn't this cause the plasma to lose energy like the fusor plasma impacting the grid? Very much so. Unless something can largely prevent plasma impacts on the supports the reactor will have trouble breaking even. I don't recall w...
by RERT
Mon Oct 27, 2014 7:35 pm
Forum: News
Topic: Aviation Week on the Lockheed Skunkworks CFR
Replies: 186
Views: 106861

Re: Aviation Week on the Lockheed Skunkworks CFR

I think the easiest way to simulate an "endless chain" of cells with the software I'm using is to put a dielectric with 100% reflection across the point cusp. I can already tell by visual inspection of the setup I'm currently running that the vast majority of loss is through those cusps. (ignoring ...
by RERT
Mon Oct 27, 2014 6:56 pm
Forum: News
Topic: EM Drive
Replies: 710
Views: 378414

Re: EM Drive

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.
by RERT
Sat Oct 25, 2014 9:04 am
Forum: News
Topic: Aviation Week on the Lockheed Skunkworks CFR
Replies: 186
Views: 106861

Re: Aviation Week on the Lockheed Skunkworks CFR

Hanleyp: "...But the confinement becomes leaky via cross field diffusion, mostly near the pole cusps, and unless the latest revision I've made fixes it it gets confinement time in microseconds in simulation...." One observation on the LM field arrangement (at least in the patent) is that it is all-b...
by RERT
Thu Oct 23, 2014 7:48 am
Forum: News
Topic: Aviation Week on the Lockheed Skunkworks CFR
Replies: 186
Views: 106861

Re: Aviation Week on the Lockheed Skunkworks CFR

Solo - worth noting that if something has to carry current into the internal coils, it will presumably be via the supports. The radial current will set up a circulating field which will tend to divert the cusp flow around the supports. At least, that is as far as my intuition goes. I can't immediate...
by RERT
Thu Oct 23, 2014 7:37 am
Forum: News
Topic: EM Drive
Replies: 710
Views: 378414

Re: EM Drive

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.
by RERT
Sat Oct 18, 2014 7:52 am
Forum: News
Topic: Aviation Week on the Lockheed Skunkworks CFR
Replies: 186
Views: 106861

Re: Aviation Week on the Lockheed Skunkworks CFR

Someone mentioned earlier 4 line cusps - I count just 2 circular line cusps parallel to the rings between the central and outer coils. Where are the others?