Search found 2777 matches

by Giorgio
Fri Nov 27, 2020 12:13 pm
Forum: News
Topic: Creating a magnetic field at a distance
Replies: 8
Views: 165

Re: Creating a magnetic field at a distance

And Lentz (2020) explicitly suggested confined plasma as a gravitational source in his energy-condition-respecting superluminal soliton. It is an interesting theoretical paper but energy requirements for now are in the same range as Alcubierre drive, so it is out of our technological testing possib...
by Giorgio
Sun Oct 25, 2020 10:50 am
Forum: News
Topic: Z-Pinch Renaissance
Replies: 170
Views: 105891

Re: Z-Pinch Renaissance

Considering the importance of the issues (and the constant need of research funds they have) I would have expected them to rise to general attention the overcoming of this issue as a major point in favor of financing their tech. Anyhow, I like your optimism and I deeply wish you to be totally right ...
by Giorgio
Sat Oct 24, 2020 3:28 pm
Forum: News
Topic: Z-Pinch Renaissance
Replies: 170
Views: 105891

Re: Z-Pinch Renaissance

I am quoting that 2006 paper because is the only paper where they mention the issue. After this paper in no other public paper or presentation that I have read the thermalization issue was ever mentioned as "overcome" or "tested" or "solved". The scaling laws in the ZAP-HD and FuZE machines are hold...
by Giorgio
Thu Oct 22, 2020 3:27 pm
Forum: News
Topic: Z-Pinch Renaissance
Replies: 170
Views: 105891

Re: Z-Pinch Renaissance

Not to interrupt you gentlemen's interesting technical discourse but what about a compromise? Say one of those small modular nuclear reactors of the type that Trump just approved funding for? What me and Skipjack are digressing about is not on the type of power reactor that is needed but on the nee...
by Giorgio
Thu Oct 22, 2020 10:28 am
Forum: News
Topic: Z-Pinch Renaissance
Replies: 170
Views: 105891

Re: Z-Pinch Renaissance

I think those are already included in the design of the ZAP, but you still need to charge them from a source before the reactor first shot and also in any event when there is not enough energy charge to allow for another shot. I disagree with that. We agree that we disagree, we will just need to wa...
by Giorgio
Wed Oct 21, 2020 9:41 pm
Forum: News
Topic: Z-Pinch Renaissance
Replies: 170
Views: 105891

Re: Z-Pinch Renaissance

First, the reason why I added a fission reactor is that you need anyhow enough electrical power to "start" the first fusion reaction, so you need anyhow a secondary continuous and reliable electrical source whenever you need to start the reactor. Capacitor bank. I think those are already included i...
by Giorgio
Wed Oct 21, 2020 12:34 am
Forum: News
Topic: Z-Pinch Renaissance
Replies: 170
Views: 105891

Re: Z-Pinch Renaissance

Ok, why such a huge ship? 30,000 tonnes is quite big, IMHO, especially when using only one engine (engine mass is not really that relevant). Would have to agree: I think we will have to agree before if we are doing a "theoretical analysis" based on yet to come technologies or implementing a practic...
by Giorgio
Tue Oct 20, 2020 12:16 am
Forum: News
Topic: Z-Pinch Renaissance
Replies: 170
Views: 105891

Re: Z-Pinch Renaissance

F=MA Wrong formula and also you didn't include the fuel mass in the calculations. For a rocket you need to use Tsiolkovski rocket equation [ dV=Ve x ln(Mi/Mf) ]as acceleration will increase while total mass decreases over time. Ok, why such a huge ship? 30,000 tonnes is quite big, IMHO, especially ...
by Giorgio
Sun Oct 18, 2020 4:43 pm
Forum: News
Topic: Z-Pinch Renaissance
Replies: 170
Views: 105891

Re: Z-Pinch Renaissance

As I said in an earlier post, I think that the ZAP rocket engine, when operated like a gas core NTR could sustain a pulse rate of 150 Hz and achieve an Isp of 5,000 seconds. Thrust should be good enough to make use of fast transfer options. I can't comment on what would be the thrust level of a gas...
by Giorgio
Sun Oct 18, 2020 1:19 pm
Forum: News
Topic: Z-Pinch Renaissance
Replies: 170
Views: 105891

Re: Z-Pinch Renaissance

First you have to locate the asteroid containing the volatiles you are looking for then cost/time to reach it and setup operations there. After you deplete said asteroids' limited resources you have to locate the the next one and repeat the process. We already know where Saturn & Titan are and woul...
by Giorgio
Thu Oct 15, 2020 1:28 am
Forum: News
Topic: Z-Pinch Renaissance
Replies: 170
Views: 105891

Re: Z-Pinch Renaissance

Probably more Nitrogen (& other useful volatiles) in Titan's atmosphere and surface than all the N2 in the entire asteroid belt, all in one place. That might be true, but the Asteroid belt is between 180 and 300 million km far from Earth, while Titan is 1300 Million km far. We can imagine a 6 to 8 ...
by Giorgio
Sun Oct 11, 2020 9:38 am
Forum: News
Topic: Z-Pinch Renaissance
Replies: 170
Views: 105891

Re: Z-Pinch Renaissance

Skipjack wrote:
Sat Oct 10, 2020 4:43 pm
I think that asteroids containing Carlsbergite might be the source of nitrogen on Earth
I didn't know about Carlsbergite and I didn't expect that it was a CrN compound... Quite unusual and intriguing.
At 21% N content this could indeed be an excellent starting raw material.
by Giorgio
Sat Oct 10, 2020 9:02 am
Forum: News
Topic: Z-Pinch Renaissance
Replies: 170
Views: 105891

Re: Z-Pinch Renaissance

Anhydrous ammonia is an interesting comparison. A bit harder to store than water, but respectable density can still be had with modest pressure or refrigeration. In deep space a simple radiator system my be enough for the latter. In the engine it thermally decomposes to lower molecular mass diatomi...
by Giorgio
Fri Oct 09, 2020 12:59 pm
Forum: News
Topic: Z-Pinch Renaissance
Replies: 170
Views: 105891

Re: Z-Pinch Renaissance

Minor correction that is 3.3 TW not GW; yes that engine would need some serious coolant: Many countries (including mine) use "." to separate thousands and "," for decimal. Many other countries (including US and UK) have an opposite system. There has been several attempts to standardize this issue b...
by Giorgio
Fri Oct 09, 2020 9:29 am
Forum: News
Topic: Z-Pinch Renaissance
Replies: 170
Views: 105891

Re: Z-Pinch Renaissance

What I liked of the FuZe engine proposal was the lack of magnetic nozzle at the engine end that indeed would simplify a lot the engine, but everything else that was into the 2006 paper was honestly not so exciting for a real life application. The 2006 paper was based on the results of a MS thesis su...