Search found 1142 matches
- Tue Jan 06, 2015 4:26 am
- Forum: News
- Topic: Angara News
- Replies: 19
- Views: 12335
Re: Angara News
Are you seriously equating manufacturing cost with reburbishment costs. Really? Of course not. Didn't you read my post? Let me try this again: Higher Isp gives a larger proportional performance advantage to a reusable than it does to an expendable, for the simple reason that the stage performance a...
- Wed Dec 31, 2014 8:44 pm
- Forum: General
- Topic: polywell mentioned in post
- Replies: 1
- Views: 1893
Re: polywell mentioned in post
They claim EMC2 is targeting D-³He. I imagine the author saw "aneutronic" and jumped to conclusions without checking...
...either that or I've missed some major news...
...either that or I've missed some major news...
- Sun Dec 28, 2014 2:56 am
- Forum: News
- Topic: Mach Effect progress
- Replies: 2707
- Views: 1465888
Re: Mach Effect progress
A large part of my lack of concern is due to the fact that we don't yet have the technology in question, and by the time we do the theoretical ramifications will be much better understood. I actually disagree with the idea that M-E use accelerates the expansion of the universe. But my attitude is ba...
- Sat Dec 27, 2014 8:28 pm
- Forum: News
- Topic: Mach Effect progress
- Replies: 2707
- Views: 1465888
Re: Mach Effect progress
Not sure what centripetal force masquerading like gravity gets you from the perspective as an energy source. Nothing. I'm referring to M-E gravity control like what GIThruster was talking about. If you can do that, you can almost certainly make an M-E energy generator quite easily. Also, in case yo...
- Sat Dec 27, 2014 2:25 am
- Forum: News
- Topic: Mach Effect progress
- Replies: 2707
- Views: 1465888
Re: Mach Effect progress
[*] We have the ability to artificially create gravity, either by centripetal force or mastery of ME (assuming this is actually possible). [...] Another thing space at least the region around stars has a lot of is free energy. The only thing that is needed is either reflectors to concentrate the li...
- Fri Dec 26, 2014 9:03 pm
- Forum: News
- Topic: Angara News
- Replies: 19
- Views: 12335
Re: Angara News
If you can fly your first stages back, the Specific Impulse of their fuel becomes almost secondary. On the contrary. Hardware procurement is far from the only cost that scales with the size of the vehicle. And flyback and landing maneuvers increase the impulse requirement on the stage (or else load...
- Fri Dec 26, 2014 1:03 am
- Forum: News
- Topic: Angara News
- Replies: 19
- Views: 12335
Re: Angara News
If you want best possible ISP, staged combustion and high chamber pressure are favored. If you want low cost and rock solid reliability, gas generator or expander cycle and lower chamber pressure are preferred. It's an engineering trade off. I am curious to see how the Raptor will perform in this r...
- Thu Dec 25, 2014 9:26 am
- Forum: News
- Topic: Angara News
- Replies: 19
- Views: 12335
Re: Angara News
". . .powered by RD-191, arguably the world’s best “clean” engine that uses kerosene and oxygen as fuel." Does it produce higher Isp's and have lower weight and higher reliability than the SpaceX thrusters like the Merlin? Vacuum thrust-to-weight seems to be just shy of 100, versus ~150-160 (insuff...
- Wed Dec 24, 2014 9:37 pm
- Forum: News
- Topic: Mach Effect progress
- Replies: 2707
- Views: 1465888
Re: Mach Effect progress
The things you listed are not real road blocks It sounds like you may have misread my post. I don't recall listing any "road blocks"... More importantly, you were complaining about gravity wells in general, not Earth specifically. And my basic point was that high-thrust METs obviate the biggest rea...
- Wed Dec 24, 2014 7:59 pm
- Forum: News
- Topic: Mach Effect progress
- Replies: 2707
- Views: 1465888
Re: Mach Effect progress
why would you do construction in a gravity well. I get that it will be necessary in the short term. But it seems to me it would be much easier overall to eventually migrate all manufacturing into space. Why? Gravity, air and easy access to resources make most things easier, not harder. Barring spec...
- Fri Dec 19, 2014 11:03 am
- Forum: News
- Topic: Mach Effect progress
- Replies: 2707
- Views: 1465888
Re: Mach Effect progress
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 clo...
- Thu Oct 30, 2014 12:52 am
- Forum: News
- Topic: Orbital Sciences rocket explodes on launch
- Replies: 49
- Views: 23502
Re: Orbital Sciences rocket explodes on launch
I've seen "rapid unscheduled disassembly", which on the NSF forum is often abbreviated RUD. Whatever you call it, combined with the earlier test stand failure, this is kinda worrying. But of course the thing to do in these cases is hold off making any hasty judgments until the accident investigation...
- Wed Oct 15, 2014 8:35 pm
- Forum: News
- Topic: The Impossible Thruster Works
- Replies: 15
- Views: 10814
Re: The Impossible Thruster Works
I'm intrigued by the apparent close correlation of McCulloch's predictions with the reported results. (Even if he's wrong, he could, like Shawyer, be right by accident.) Unfortunately I don't have the time to keep up with the thread...
- Sun Aug 24, 2014 8:51 am
- Forum: General
- Topic: How to defeat ISIL
- Replies: 243
- Views: 67336
Re: How to defeat ISIL
I guess there is an assymmetry - the Holy sites of all the book religions are in one place and this is and was dominated by Islam, so you get Christian incursions there in a manner that would not be reciprocated. [*facepalm*] http://en.wikipedia.org/wiki/Battle_of_Yarmouk http://en.wikipedia.org/wi...
- Sun Aug 24, 2014 1:44 am
- Forum: General
- Topic: For the same pricetag to mitigate climate change
- Replies: 18
- Views: 5348
Re: For the same pricetag to mitigate climate change
gas pressure laws suggest to me, sending atmosphere from Venus to Mars under its own pressure is quite possible. Yeah, it seems like a lot of gas pressure. But it isn't even enough to get a noticeable amount of gas out of Venus' gravity well (which is why it's still down there), and Mars is much fu...