Search found 1131 matches

Mon Oct 28, 2013 8:55 pm
Forum: General
Topic: Engineering zero margin for error
Replies: 4
Views: 688

Re: Engineering zero margin for error

You guys have read "The Cold Equations", right?

No real-life system is ever engineered with zero margin. Ever.

Not deliberately, anyway...
Thu Oct 17, 2013 7:05 am
Forum: News
Topic: Mach Effect progress
Replies: 2691
Views: 852589

Re: Mach Effect progress

The M-E equation appears to obey Lorentz covariance. It does not contain any direct reference to any velocity state other than that of the local active mass. This is to be expected from an equation derived from a model of inertia, since inertia does not reference any absolute velocity (only its time...
Mon Sep 30, 2013 4:42 am
Forum: News
Topic: Mach Effect progress
Replies: 2691
Views: 852589

Re: Mach Effect progress

Remember, this is a maximum . In other words, the energy gained by an accelerating spacecraft cannot exceed the energy provided to its thrusters in any reference frame , assuming the thrusters use internally-carried propellant. This is because the loss of mass due to expenditure of propellant becom...
Mon Sep 23, 2013 10:08 am
Forum: News
Topic: Mach Effect progress
Replies: 2691
Views: 852589

Re: Mach Effect progress

I also think 93143’s comment that “getting energy conservation in an analysis of a thruster of any kind requires one to account for energy transferred to or from what the thruster is pushing on” is spot on. Thanks for the support... http://en.wikipedia.org/wiki/Linear-quadratic_regulator What has d...
Fri Sep 20, 2013 12:14 am
Forum: News
Topic: Li-ion battery with ~3X specific energy (Wh/kg) increase
Replies: 11
Views: 7075

Re: Li-ion battery with ~3X specific energy (Wh/kg) increase

You can't vary the voltage that way; this isn't a capacitor. Individual voltaic cells have a characteristic potential that depends only on their chemistry (and a bit on the state of charge, especially near empty). Given the fairly wide range of energy densities (and variation in characteristic poten...
Sun Sep 15, 2013 8:22 pm
Forum: General
Topic: Any news on Lockheed's fusion plans
Replies: 4
Views: 1441

Re: Any news on Lockheed's fusion plans

The weird part is that they said anything at all.
Wed Sep 11, 2013 10:39 pm
Forum: News
Topic: Mach Effect progress
Replies: 2691
Views: 852589

Re: Mach Effect progress

Sorry; delete/repost with edits... You have read some of what I've posted, yes. But you haven't understood it. This becomes painfully clear when you start talking about Lorentz transforms instead of acknowledging the simple and obvious reality that getting energy conservation in an analysis of a thr...
Wed Sep 11, 2013 10:35 pm
Forum: News
Topic: Mach Effect progress
Replies: 2691
Views: 852589

Re: Mach Effect progress

You really need to seriously consider the possibility that you're wrong, that you've been wrong for years, and that you are only making yourself look bad by continuing to insist otherwise without even listening to anyone who disagrees with you. The weird thing is, I can't even do a worked problem to...
Wed Sep 11, 2013 8:46 pm
Forum: News
Topic: Mach Effect progress
Replies: 2691
Views: 852589

Re: Mach Effect progress

This is surreal. GIThruster, you're abusing people for not knowing physics, when not only do you not know the relevant physics yourself, but you haven't even understood what we're arguing about. I'm not sure how much more time I should spend on this. I can explain, but only if you're willing to list...
Tue Sep 10, 2013 11:03 pm
Forum: News
Topic: Mach Effect progress
Replies: 2691
Views: 852589

Re: Mach Effect progress

I'm a mechanical engineer. You don't think non-inertial coordinate systems were part of my training? I know how to handle them and what to watch for. I know what changes, and what doesn't. (Also, I will remind you that an accelerating object does not necessarily imply an accelerating reference frame...
Tue Sep 10, 2013 10:54 pm
Forum: News
Topic: Mach Effect progress
Replies: 2691
Views: 852589

Re: Mach Effect progress

Nobody cares about the acceleration. You can attach the M-E thrusters to two different planets if you want, so the thrust is substantial but the acceleration is negligible - you still get the exact same issue with relative VELOCITY. You're not addressing the correct issue here; you're just handwavin...
Tue Sep 10, 2013 10:45 pm
Forum: News
Topic: Mach Effect progress
Replies: 2691
Views: 852589

Re: Mach Effect progress

It doesn't suggest anything like a preferred frame. Actually, it does suggest a preferred frame, which is why I suggested that some obscure GR weirdness (or a basic principle of Galilean physics that I'm stupidly missing, or something in between) might be automatically matching the effective mean v...
Sun Sep 08, 2013 3:01 am
Forum: News
Topic: Mach Effect progress
Replies: 2691
Views: 852589

Re: Mach Effect progress

I don't think that last part is right. Forces don't transform; they're absolute.

This is the core of Woodward's argument against the Oak Ridge fallacy, wherein the v*dm/dt term is alleged to cancel out the Mach effect.
Sat Sep 07, 2013 11:04 pm
Forum: News
Topic: Mach Effect progress
Replies: 2691
Views: 852589

Re: Mach Effect progress

But that's not why, as I've explained before. The math works fine when you account for the energy of the propellant. This is because the kinetic energy of a single mass is not a true energy, as can be seen from the fact that it is not frame-independent. Kinetic energy accounting can only be done in ...
Fri Sep 06, 2013 8:32 pm
Forum: News
Topic: Mach Effect progress
Replies: 2691
Views: 852589

Re: Mach Effect progress

The other is to explain why that point is stupid. He did that. You just didn't understand him. Basically, the idea is this: You don't have to measure a push on the rest of the universe to validate M-E theory. All you have to do is calculate what the theory predicts, and show lab results that are bo...