Shpaget
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Posts posted by Shpaget
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15 hours ago, Spacescifi said:
The main show stoppers in real life would be energy density
Yeah, I'm gonna say you don't really understand what energy density means.
What's with the engine melting fixation?
Magnets are, despite what some may say, in fact, not magic.
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Are we talking about lifting gas or actual fuel? Why would the answer be any different than for any other aircraft?
Jet A-1.
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3 hours ago, Hannu2 said:
if you have same roll rate than planet and can somehow manage controls. I would not like to try it with hand control id spinning rate is noticeable.
Orbital period at Earth surface is about one and a half hours. You can safely ignore it.
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Such a planet can not form naturally, so your handwavium shell would need to be built before the spin up.
In any case, if you match your spacecraft speed so it's zero relative to the surface, and fly on a tangential path with periapsis at the height of the docking port, you're good to go.
Then again, a civilization that can shrink wrap a planet in unobtanium and spin it up, probably won't have much trouble just brute forcing the approach.
For the curious visitors who don't have such capability, landing on the poles would be much easier.
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9 hours ago, Nuke said:
i figure if were talking centrifuge were probibly using nuclear engines or better. i dont think we will be able to manage anything other than a tumbling pigeon config with chemical engines, you just cant afford the superfluous mass.
A Mars cycler could be significantly bigger than bare bones, simce you only need to push it once. Once it's cycling you shuttle people and cargo on minimal crafts, but the cycler itself could be massive.
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3 minutes ago, AngrybobH said:
But, I do wonder, why rotate a piece of the ship? You could just make all the stuff fixed and rotate the whole thing. I would think a little gravity would help with things like fuel tanks and water recycling.
Science, recreation, communication (directional antennas), and, of course, docking.
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Power transfer is fairly trivial, sliding or rolling contacts should have no problem with this. Trains do it all the time.
Liquids (and non air gasses) are a bit tricky. Freely rotating fittings, aka rotary units, are available. If center of rotation needs to be clear of obstruction (at least occasionally) perhaps storage tanks on both sides and an automatic coupling / decoupling system?
Air goes through the same hole people do.
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Maximum number. That's why they don't bother with puny slow light speed coms and go with the good old FTL that any high school slime mold can make in less time than it takes to emerge from their fourth cacoon.
My point is, presuming FTL coms is somehow possible (yeah I know all about the paradoxes, bear with me), they may consider it so basic that they don't even consider using radio since that's as obsolete as carrier pidgeons.
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1 hour ago, tater said:
What is the point of trying to communicate with other species around other stars?
Betterment of everybody involved, I would hope.
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On 8/25/2022 at 1:40 AM, tater said:
Radio because it is an obvious choice for communications over extremely long distances.
What if it's an obvously poor choice? That is, from a standpoint of a civilistion that uses some trivial FTL method of communication which we haven't stumbled upon?
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Why would you bother with their small fighters when you can just mount an engine to the nearest rock and rearrange their tectonic plates?
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4 hours ago, sevenperforce said:
So, propellers.
This. Put it in a tube and it's a ducted fan.
Add a few more similar, a few a bit different ones and some sprinklers and you get yourself a jet engine.
Then research a bit about existing and proposed air breathing engines and their role in getting to orbit.
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TV's on in the background. The movie Absolute Zero is on. I've already seen this absolute dumpster fire of bad science, but I missed this little gem.
For those of you lucky enough to not be introduced to this disaster of a movie with absolute zero real science, long story short, Earth's magnetic poles are shifting (over the period of couple of hours) which naturally causes the temperature in Miamy, FL to instantly drop to absolute zero.
Anyway I just so happened to look at the screen when one of the scientists gives somebody a hand held compass, points to the S marking on it and instructs them to enter the bunker when the dial reaches the S mark.
Movie scripts should be peer reviewed.
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7 minutes ago, HebaruSan said:
Is there a reason for the outer door to close fast?
Launch cadence, presumably.
Fast outer door means less air to pump before next launch, and since they dream about launching every couple of hours, this would help.
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Can't help but think about all the dv wasted.
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Is SpaceX pushing the sales of SS, or is this sat so big that FH is not enough and there is actual need for the SS capacity?
Or is SX already offering SS at cost below F9/FH?
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They seem to be perfectly happy with mechanical double door solution.
They even claim that no air gets into the main chamber before the inner doors shut.
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Usually I would agree, but nations have poured billions into this exact problem.
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The fact that it doesn't exist, along side the cost of current suits, should tell you that it's not possible with current tech.
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On 8/9/2022 at 11:09 PM, SunlitZelkova said:
*ahem*
The farthest a human rated vehicle has flown is the Apollo 10 LM Ascent Stage which flew to and remains in solar orbit, which was actually human rated and carried humans at one point before embarking on its final flight.
Gesundheit!
What about that Tesla car?
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Helicopter blades are constrained by the speed of sound. You don't want the tips to be faster, since a lot of aerodynamics bresk down above Mach 1.
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Color of the exhaust is related to its temperature, not the amount of thrust.
Take a look at Space Shuttle. SRBs have much higher thrust than SSMEs.
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59 minutes ago, mikegarrison said:
This is an overstatement.
For example, one of the most famous SF short stories, "The Cold Equations", got all of its drama and shock value out of a small landing shuttle not having enough delta-v to safely land with a stowaway on board. Another example is the drama in The Martian relating to the MAV not having enough delta-V to match velocity with the ship coming to pick up Watney
Not quite the same thing. Examples you provide boil down to "We don't have enough fuel to do x".
OP proposal to explicitly state and specify the ISP of 300 s is "Our car has a fuel economy of x mpg, therefore we need to go faster to reach our destination." which is not only non sequitur, but also ISP 300 s is not something that will provide "lots of thrust from small amounts of fuel combusting" (again, unrelated things, not to mention that a rocket with that kind of ISP absolutely will need a lot of fuel to reach orbit, physics breaking magical grav nullification or not).
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Then just have it. Skip the details and have a ship that can do multiple orbital launches and landings, with interplanetary (or interstellar) travel inbetween occasional refuelling. You don't need to provide the blueprints for the engines. Just have them do whatever you want them to do that is needed for the story. If you later realize they're OP, have a malfunction in the gefufen oscilator, or the antagonist discovers a way to track your ship, or there is an administrative delay because one of the crew decided to transport the Blomulaxian pentaworm which is, obviously, not allowed. Noone cares about ISP in scifi.
Seeking a modern solution for strata/owner communications ('net/app/sms based)
in Science & Spaceflight
Posted
At work we have [email protected] address that forwards the email to everybody in the list (BCC to hide individual addresses).
Perhaps something along those lines?