Search found 1175 matches

by Aero
Sat Sep 09, 2017 4:12 am
Forum: News
Topic: SpaceX News
Replies: 1826
Views: 168038

Re: SpaceX News

Just googled "length of falcon 9 first stage" and got 47.7 meters with interstage. That's ~156.5 feet.
by Aero
Sat Sep 02, 2017 4:23 pm
Forum: News
Topic: EMC2 news
Replies: 205
Views: 32230

Re: EMC2 news

I second that. NEVER let yourself believe that the simulation is reality. They are much more helpful after experiments, used to discover where the current understanding of reality is amiss.
by Aero
Wed May 17, 2017 3:44 pm
Forum: News
Topic: SpaceX News
Replies: 1826
Views: 168038

Re: SpaceX News

Does anyone suppose that the techniques developed for the return of the fairing would have any carry-over to the return of the second stage?
by Aero
Thu Apr 20, 2017 8:20 pm
Forum: General
Topic: Skynet is coming.
Replies: 684
Views: 69229

Re: Skynet is coming.

AI Telemarketers - They figure out who will buy, call, sell, then change the spiel and repeat.
by Aero
Mon Dec 19, 2016 9:20 pm
Forum: News
Topic: Bill Gates is heading a $1 billion venture fund to combat climate change
Replies: 445
Views: 18060

Re: Bill Gates is heading a $1 billion venture fund to combat climate change

It seems to me that almost everyone misses the point on global warming. The point is not so much that warming is happening, its the question of what is causing the warming? Is it people and our activities as is claimed - or is it partly or mostly a natural cycle that would be happening even if there...
by Aero
Sat Dec 10, 2016 1:22 am
Forum: News
Topic: SpaceX News
Replies: 1826
Views: 168038

Re: SpaceX News

And they found a reason for the event that was NOT sabotage. That is good ...
by Aero
Sat Oct 01, 2016 5:59 pm
Forum: News
Topic: SpaceX News
Replies: 1826
Views: 168038

Re: SpaceX News

I see the grid fins but where are the landing legs?
by Aero
Sun Jul 31, 2016 2:53 am
Forum: News
Topic: SpaceX News
Replies: 1826
Views: 168038

Re: SpaceX News

Fun thing will be when the rockets start taking off, refueling while in space, then landing with enough to take off again, making the ground the stop off point, not space. Never happen with chemical fuel. The delta V to come down from orbit would be the same as the delta V needed to reach orbit so ...
by Aero
Sun Mar 08, 2015 3:48 pm
Forum: News
Topic: Hyperloop Technologies
Replies: 32
Views: 5891

Re: Hyperloop Technologies

Since we're talking about emergency pressurization scenarios, what happens if a car is speeding along and an earth quake or some other disaster rips the tube completely apart some few miles ahead of the car? The air will rush in, the speeding car will slam into the inrushing air and quickly decelera...
by Aero
Wed Jan 14, 2015 7:09 pm
Forum: News
Topic: EM Drive
Replies: 639
Views: 115223

Re: EM Drive

I wish I knew the answer. I don't. I do know that energy can not be added to an evanescent wave by increasing the evanescent wave frequency, because evanescent waves don't have a frequency. They are not propagating waves in the sense we think of, rather they are expotentially decaying waves. But I ...
by Aero
Wed Jan 14, 2015 2:10 am
Forum: News
Topic: EM Drive
Replies: 639
Views: 115223

Re: EM Drive

Okay, lets see if I can get this written out properly. Don't know half the proper terms I probably should to say this, so bear with me. If the velocity is more than C than you have to completely rewrite physics. So the "superluminal" wave is still traveling at C right? But, if you simply ...
by Aero
Wed Jan 14, 2015 12:19 am
Forum: News
Topic: EM Drive
Replies: 639
Views: 115223

Re: EM Drive

So where is the extra energy to give a "superluminal" momentum without an FTL speed? I got your math, most articles on this stuff unfortunately use the higher formulas that can't really be understood without advanced calculus and they assume you know what a lot of variables and stuff mean...
by Aero
Tue Jan 13, 2015 11:21 pm
Forum: News
Topic: EM Drive
Replies: 639
Views: 115223

Re: EM Drive

Just glancing over the piece in wiki about evanescent waves, and I don't think this can generate thrust. For one thing is is non-radiative and only occurs when a wave is reflected inside a material. The wave is therefore limited to the interior of that materials, like a waveguide; and does not appe...
by Aero
Tue Jan 13, 2015 4:53 pm
Forum: News
Topic: EM Drive
Replies: 639
Views: 115223

Re: EM Drive

That is that evanescent wave photons can, in some circumstances have superluminal momentum. What's the difference between momentum and velocity(?) here? Of course you know that momentum in general is given by p = m*v, so p is velocity multiplied by a mass. Here we are looking at a mathematical resu...
by Aero
Tue Jan 13, 2015 2:10 am
Forum: News
Topic: EM Drive
Replies: 639
Views: 115223

Re: EM Drive

How does the evanescent wave explanation answer objections that this violates conservation? Oh, I failed to mention a very important fact which has recently received considerable attention in medical sensor research and measurements. That is that evanescent wave photons can, in some circumstances h...

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