Search found 1134 matches

by 93143
Fri Nov 27, 2020 10:31 pm
Forum: News
Topic: Creating a magnetic field at a distance
Replies: 11
Views: 4691

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 93143
Fri Nov 27, 2020 8:14 am
Forum: News
Topic: Creating a magnetic field at a distance
Replies: 11
Views: 4691

Re: Creating a magnetic field at a distance

I was thinking warp drive. I've often thought that if anything like the Woodward theory is possible, a very little confined plasma could in principle be excited to produce significant gravitational effects. And Lentz (2020) explicitly suggested confined plasma as a gravitational source in his energy...
by 93143
Wed Nov 25, 2020 2:04 pm
Forum: News
Topic: Creating a magnetic field at a distance
Replies: 11
Views: 4691

Re: Creating a magnetic field at a distance

Physical Review Letters: https://journals.aps.org/prl/abstract/1 ... 125.177204

Better?

Yes, it's paywalled, but you can at least read the abstract for free...
by 93143
Sun Dec 01, 2019 1:15 am
Forum: News
Topic: Dark matter theories
Replies: 35
Views: 35093

Re: Dark matter theories

F/m = GM/r²

M = 100000000000 kg
G = 0.0000000000667408 m³/kg·s²
r = 0.001 m

F/m = 6674080 N/kg

r = 1 m
F/m = 6.67408 N/kg
m = 70 kg
F = 467.1856 N = 105 lbf

These things could be really dangerous...
by 93143
Sat Oct 29, 2016 3:35 pm
Forum: General
Topic: boostrapping a mars colony
Replies: 71
Views: 29405

Re: boostrapping a mars colony

Technically the original 6502 was NMOS (as was the unlicensed clone in the Famicom/NES, if I'm not mistaken). The CMOS version was the 65C02, and it fixed a few bugs as well as tossing out the undocumented opcodes in favour of additional "real" opcodes. My experience, such as it is, is with the 5A22...
by 93143
Tue Aug 30, 2016 7:20 am
Forum: General
Topic: An Interesting SETI Candidate in Hercules
Replies: 6
Views: 4779

Re: An Interesting SETI Candidate in Hercules

https://en.wikipedia.org/wiki/Kardashev_scale

Is there a type of stellar maser that produces a single peak at ~11 GHz?
by 93143
Sat Aug 06, 2016 9:43 pm
Forum: General
Topic: Freon moderated reactor
Replies: 15
Views: 9586

Re: Freon moderated reactor

That is the big advantage of a NERVA style motor: it really doesn't care what type of "fuel" you push through it, as long as it doesn't interfere with the heating process. Since no one else has mentioned it, I'll just note that this is entirely untrue, for two separate reasons, neither of which has...
by 93143
Fri Mar 25, 2016 4:33 am
Forum: News
Topic: SpaceX News
Replies: 2289
Views: 836287

Re: SpaceX News

It was Jupiter IRBMs in Turkey. Atlas, being an ICBM, could hit its targets from much further away.

There are old Atlas and Titan bases scattered all over the continental U.S.; I believe there was something of a fire sale on them a while back.
by 93143
Tue Feb 23, 2016 4:55 am
Forum: General
Topic: Can any of you Rocket heads explain this?
Replies: 22
Views: 11609

Re: Can any of you Rocket heads explain this?

I don't have a formal education in rocket design, but I should have enough expertise in the general area to figure out something like this. Lemme take a crack at it: What I don't get is how dumping exhaust gas from the turbine preburner into the combustion chamber boosts pressure. It doesn't. But in...
by 93143
Sat Jan 23, 2016 3:13 am
Forum: General
Topic: Planet Nine from Outer Space!
Replies: 22
Views: 10778

Re: Planet Nine from Outer Space!

I've got to say, I don't like the idea of calling it Nemesis. In the first place, Nemesis was supposed to be much further out than this thing; its orbital period would be a couple thousand times as long, and instead of perturbing the Kuiper belt to confuse astronomers with Sedna-like objects, it wou...
by 93143
Sat Aug 08, 2015 5:20 am
Forum: News
Topic: We Need Clean-Energy Innovation, and Lots of It - Bill Gates
Replies: 8
Views: 10568

Re: We Need Clean-Energy Innovation, and Lots of It - Bill G

Apparently he's backing a TWR.
by 93143
Thu Apr 02, 2015 2:08 am
Forum: News
Topic: NASA returning to NERVA?
Replies: 44
Views: 25383

Re: NASA returning to NERVA?

I would take Zubrin's opinion on this with a grain of salt. He seems to have something against VASIMR (probably because it conflicts with his own Mars scheme), and his arguments are overblown. Handwaving based on a tiny Russian reactor from the '70s is disingenuous, especially when studies of potent...
by 93143
Mon Mar 30, 2015 2:28 am
Forum: News
Topic: SpaceX News
Replies: 2289
Views: 836287

Re: SpaceX News

The block buy already covers the capability contract (the subsidy) for more launches than are supplied by the 36-core procurement. Besides, you're forgetting a couple of things - first, we were talking about Atlas*, and Delta is more expensive; second, ULA has other customers, who pay the lower pric...
by 93143
Fri Mar 27, 2015 12:49 am
Forum: News
Topic: SpaceX News
Replies: 2289
Views: 836287

Re: SpaceX News

GIThruster wrote:Those Atlas V's cost $400M
No they don't.
by 93143
Wed Mar 25, 2015 8:32 pm
Forum: News
Topic: SpaceX News
Replies: 2289
Views: 836287

Re: SpaceX News

Yeah, at least with a flywheel design it takes significant thrust efficiency to get net power, because the relative speed of the thruster with respect to the generating equipment it's reacting against has to be high enough that F · v (minus losses) exceeds the thruster's input power. I can't imagine...