Search found 2830 matches

by Giorgio
Tue Oct 20, 2020 12:16 am
Forum: News
Topic: Z-Pinch Renaissance
Replies: 174
Views: 135041

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: 174
Views: 135041

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: 174
Views: 135041

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: 174
Views: 135041

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: 174
Views: 135041

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: 174
Views: 135041

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: 174
Views: 135041

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: 174
Views: 135041

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...
by Giorgio
Thu Oct 08, 2020 10:10 pm
Forum: News
Topic: Z-Pinch Renaissance
Replies: 174
Views: 135041

Re: Z-Pinch Renaissance

It seems to me that both, you and Carl, are making the same point that this technology is not something we will see anytime soon due to technological limitations. I agree with Carl when he says that we will see SpaceX land on mars several times before people will even think to introduce some new eng...
by Giorgio
Fri Oct 02, 2020 8:28 am
Forum: News
Topic: MIT claim they will build the SPARC
Replies: 21
Views: 28134

Re: MIT claim they will build the SPARC

Thanks for the links, I saw them from your previous post but I didn't notice that they was including also some of the papers of the coming APS presentation. I will check them thoroughly during weekend relax time, but a a first quick read has given me the impression that the design didn't change much...
by Giorgio
Thu Oct 01, 2020 3:23 pm
Forum: News
Topic: Z-Pinch Renaissance
Replies: 174
Views: 135041

Re: Z-Pinch Renaissance

I don't think that the MIT sees any show stoppers for going forward with SPARC. I am a bit confused why you think they could not? My concern is not that there is a "design" show stopper from the physics side, but engineering design for components like the divertor are simply not yet mature to be us...
by Giorgio
Thu Oct 01, 2020 10:04 am
Forum: News
Topic: Z-Pinch Renaissance
Replies: 174
Views: 135041

Re: Z-Pinch Renaissance

It's some time that it seems to me that every heat based fusion machine experiment is reaching the point where they can't improve anymore their results due to limitations of construction materials more than due to issues connected to understanding the physics of the process. All the new superconduct...
by Giorgio
Sat Sep 26, 2020 9:20 am
Forum: News
Topic: House to Vote on Fusion Research and Development
Replies: 9
Views: 3988

Re: House to Vote on Fusion Research and Development

I see, so it might just become a victim of a political skirmish between the two parties just because one proposed it even if the other party is not against it in principle. This is one of the reasons that always made me think that politics sucks. Crossing fingers for it to get under the attention ra...
by Giorgio
Fri Sep 25, 2020 9:28 pm
Forum: News
Topic: House to Vote on Fusion Research and Development
Replies: 9
Views: 3988

Re: House to Vote on Fusion Research and Development

Correct me if I am wrong, I made a quick search and i found that the senate appropriation subcommittee that should be responsible for the discussion of this bill is the "Energy and water development committee" that is under Lamar Alexander chairmanship who seems quite supportive of fusion technology...
by Giorgio
Fri Sep 25, 2020 7:16 am
Forum: News
Topic: House to Vote on Fusion Research and Development
Replies: 9
Views: 3988

Re: House to Vote on Fusion Research and Development

Excellent news, founding wise this looks like the single most important event that has happened in the last 10 years.
Finally there seems to be a light at the end of this endless tunnel of waiting.