[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: starship-design: This and that.
In a message dated 6/18/97 5:51:16 PM, hous0042@maroon.tc.umn.edu (Genny
Houston) wrote:
>Hello everyone,
>
>I've been a little withdrawn lately, but now that school is over, I will
>be more active.
>
>I've just plowed through the latest messages, and I have a few questions
>and suggestions:
>
>Questions:
>
>To: Steve VanDevender
>Re: Traveling Faster Than Light.
>
>In message dated Sun Jun 15 1997 you write: (reformated)
>
>> More importantly, relativistic physics, as we now know it,
>> does not in any way prohibit a material object from traveling
>> at any speed less than C, but does prevent anything from traveling
>> faster than that.
>
>It is my understanding (limited though it may be) that Einstein's
>equations do not prohibit travel FASTER THAN the speed of light,
>but only prohibit travel AT the speed of light. Is this not correct?
Thats what I remember. Of course that transition past C might be a problem.
Its not a theoretical imposibility.
>To: Steve VanDevender
>Re: Talking Faster Than Light.
>
>In message dated Sun Jun 15 1997 you write: (reformated)
>
>> The few FTL effects that are thought to exist in particle
>> physics don't translate to macroscopic objects, and even
>> when postulated don't transmit information or mass faster
>> than light.
>
>Again, my limited understanding tells me that communication via
>particle/wave duality phenomenom is possible. Via the following method:
>
>1) Generate a single photon every 1/100 second.
>2) use a beam spiltter to give the photon a 50% chance of:
> 3a) going to your friend (or enemy) at Tau Ceti.
> -or-
> 3b) into a trap for 12 years (perfect reflectors, whatever)
>
>Once the other photon has had enough time to arrive at Tau Ceti, send
>your 12 yr old photon into a double slit experiment. Your friend (or
>enemy) does the same. You both observe the pretty, pretty, interference
>pattern.
>
>Now comes the tricky part:
>You turn on a particle detector and are able to decide exactly which
>slit the photon went through. of course, your interference pattern
>disappears, but
>
>SO DOES THE OTHER GUY'S (and at the same time too)
>
>After sending your morse code message, you turn off your particle
>detector and stare at the interference pattern again (pretty... 8)
>
>Suddenly the pattern begins disappearing in an orderly fashion as your
>friend (who is now your enemy for ruining your interference pattern)
>transmits his message:
>
>>>Hey, thanks a lot, JERK! you riuned my interference pattern :( <<
>
>Aside from the obvious technical problems of observing the same photon
>at the same time (whatever "same time" might mean)(and BTW I can finagle
>around that one too if you insist.) This method should allow FTL
>communication. and temporal communication as well. Causality be
>damned.
Sounds familure?
Oh, what do you project your interstellar interfearence pattern on?
>To: all
>Re: support of Kyle
>
>First let me (mis)quote Clark's first law:
>
>"When an intelligent but young scientist says that something is
>possible, he is almost certainly correct. When an elderly but
>distinguished scientist says something is impossible, he is almost
>certainly incorrect."
Well its not always true. ;)
<snip>
>The Question I have:
>
>1) Why did the photon (as a wave) disappear from path (a)?
OH, I know this one! To get the the other side? state?
<Well it worked for the chicken crossing the road joke!>
>2) How did the photon "know" to stop behaving as a wave and start
>behaving as a particle?
Instinct, pure instinct.
>3) if such a well-established princple of PHYSICS can be dashed by a
>simple thought experiment (which anyone could have done in the last 50
>years but didn't)
>
> Then how can we say that FTL is impossible?
You close your eyes very tight, stick your fingers in your ears and screem "I
woun't beleave in FTL. I woun't beleave in FTL...."
>It seems to me that Kyle has done a good first order approximation of
>his star drive. He has told us the energy cost (10,000 times higher
>than the M.A.R.S. drive ;) ), it's rough size, shape and mass.
I must have missed the size and mass part.
>He has explained the first princples of it (although he claims it is
>Non-Alcubierre FTL, (E-mail dated Mon, 09 Jun 1997) it looks a lot like
>the Alcubierre method)
>
>You may say: "But how can one generate such a tremendous negative energy
>(or gravitation) gradient?"
>
>This is a valid question, but we might as easily ask Kelly how he
>intends (exactly now) to initiate a sustained fusion burn in his
>explorer class engines. ----
Would you prefer pulsed? <Noisy!>
>--We have the *feeling* that sustained controlled
>fusion is possible, but the only demonstrated method requires
>temperatures and pressures found only in the core of a star. (H-bombs
>don't count, not controlled or sustained)(break-even fusion don't count
>either)
>
>Granted that we are a hell of a lot closer to fusion that we are to ZPE
>or FTL, but then in 1970 we were much closer to fusion than we were to
>personal computers. Now personal computers are everywhere and fusion is
>still a pipe-dream.
>
>Kyle, you have a lot of work ahead of you, you are going to have to
>explain in much greater detail each step of your design. I suggest you
>start with ZPE even if FTL doesn't work, the energy from ZPE will be
>useful to other designs. expect much critisism and argument from Steve
>and Tim, but don't take it personally. they are not trying to be mean
>and nasty, they are trying to help you by making you state what you mean
>in very precise terms. If you get stuck on the math, ask nicely, and
>you'll be surpirsed at how helpful they can be.
>
>If you look through all the old archives, you can see the same pattern
>when I brought up the MARS design. Steve, I especially remember you
>telling me that there was "no way" the sail could take in photons, and
>derive enough momentum in the reation mass to overcome the momentum
>gained by the sail. It wasn't until Tim solved the equations and proved
>that it was possible that you relented (although to be honest, my
>numbers and physics were far more out of whack than yours.) And I
>suspect that Tim did it more to prove me wrong and shut me up than to
>help me. ;)
>
>The Mars design has some serious Engineering problems, but the basic
>physics are sound, you can travel at near light speed if you can spend
>about 1E18 Joules for two and a half years straight.
>
>But FTL would be better, and ZPE would solve all of my transmitter
>problems :)
>
>
>Well, that's enough physics for now. I have some things to say about
>generating Oxygen for the trip.
>
>
>
>To: all
>Re: Oxygen.
>
>I have figured out a way to recycle all the oxygen (and even extract the
>Oxygen locked up in the Stored food.
>
>
>Basic Food equation:
>
>C H O + 6 O = 6 CO + 6 H O
> 6 12 6 2 2 2
>
>As I've said before, the Water can be split into Oxygen and Hydrogen but
>what about the CO2? We must continuosly dump it into the exhaust, or
>otherwise get rid of it. But then i was thinking about the following
>equation in a book I had read.
>
> 900c
>24 H + 6 CO = 6 CH + 12 H O
> 2 2 4 2
>
>The products of both electrolysis reactions is: 18 H2 + 9 O2. So we
>must supply 6 H2 for each molecule of sugar.
>
>
>Now This assumes that we have a lot of heat, but that's true of all the
>designs I've seen so far. (except FTL of course) The methane is then
>used in further synthetic reations to make the various chemicals we
>might need, or it can be dumped into the exhaust stream to increase the
>mass flow in the thrust.
>
>If our hydroponics are supplemented by stored food supplies, Then a
>bigger problem might be Oxygen retention, rather than lack of Oxygen.
>
>--
>Kevin "Tex" Houston
I beleave all the oxegen we breath gets converted to water by matabolism. If
we electrolysize the water we produce, and burn the H2 + CO2 we should be in
great shap. (I read this recently but forgot where.)
Kelly