02-21-2019, 01:15 PM | #31 | |
Join Date: Aug 2004
Location: Denver, Colorado
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Re: Spacecraft as homes [Spaceships]
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Have a transparent shelter suspended in the center of the tank with lights that produce some UV. Have a lock in the shelter provide access to the tank with SCUBA gear. Put in some water toys, and give the crew something to do in the algae tank while waiting for the all-clear. Tropical fish may qualify as a bit of an indulgence, though....
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-- MXLP:9 [JD=1, DK=1, DM-M=1, M(FAW)=1, SS=2, Nym=1 (nose coffee), sj=1 (nose cocoa), Maz=1] "Some days, I just don't know what to think." -Daryl Dixon. |
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02-21-2019, 06:46 PM | #32 | |
Join Date: Jul 2012
Location: A crappy state called Illinois
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Re: Spacecraft as homes [Spaceships]
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At work on my only break I'm gonna get given how cray-cray it is so I'll show the math when I get home in about 3hr or so hours.
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GURB: Ultra-Tech Reloaded Normies: Man! The government is filled with liars and thieves! Me: Well yeah, here's what they're lying about, what they're stealing from you, and who's doing it. Normies: Rolls eyes Shut up conspiracy theorist Me: >.> |
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02-21-2019, 06:47 PM | #33 |
Join Date: Aug 2005
Location: Portland, Oregon
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Re: Spacecraft as homes [Spaceships]
Depends. Aren't they the first choice for an urbanite's aquarium?
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02-22-2019, 02:48 AM | #34 |
Join Date: Jul 2006
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Re: Spacecraft as homes [Spaceships]
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02-22-2019, 06:05 AM | #35 | |||
Join Date: Aug 2004
Location: Wellington, NZ
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Re: Spacecraft as homes [Spaceships]
Reading The_Ryujin's post led me to check my maths:
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Thus that sphere covered with dDR10 steel (~1.4" thick, weighing ~57 pounds per ft^2 covered) has a surface area of 52,500 ft^2. It therefore has a diameter of about 130 feet, and a volume of ~1,131,130 ft^3. This gives a density of about 18 lb/ft^3, or 0.28 times that of water (and four times that of liquid hydrogen). This sphere is has a diameter that fall in the SM+8 range, and has +2 SM for being a sphere and is thus SM+10. Quote:
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A spaceship with the density of liquid hydrogen would need three times the armour mass to get the same level of protection, and should be considered +1 SM bigger than its mass suggests for any purposes where outright size matters (e.g. getting shot at).
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Rupert Boleyn "A pessimist is an optimist with a sense of history." |
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02-22-2019, 10:53 AM | #36 | |
Join Date: Jul 2012
Location: A crappy state called Illinois
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Re: Spacecraft as homes [Spaceships]
Welp, a little latter then I planned but here it is >.>
Ok, as I said in my last post the ships in Spaceships were originally figured as simple cylinders (probably to let David use some of his work from Transhuman Space to help ease his workload). This much is actually stated in first Spaceships book: Quote:
As for the density he used, that much he has stated in several forum posts. This one isn't the best quote but I had trouble finding a better one for some reason. Note that in my originally post I mistakenly called it a shipping ton. Ok, now that we know the that the ships are treated as cylinders, the length for a given sized ship and how to figure their volume as well as their weight we can figure the radius of their ends caps there therefore their surface area. Let's use the SM +5 hull for this example which has a mass of 30 tons (which means each system weighs 3,000lbs) and a length of 45ft. Now to figure it's volume we take the fact that 20lbs per cubic feet equals 100 cubic feet per ton which means it has 3,000 cubic feet of internal volume. To find the radius of the end caps we just have to divide it's volume of 3,000ft^3 by it's length of 45ft and then divide the quotient by Pi and then find the square root of that quotient which is ~4.6. So now with the height and radius we can figure the ships surface area or (2 × Pi × 4.6 × 45) + (2 × Pi × 4.6^2) which give us a area of ~1,434ft^2. Ok, now as you suggested it's a pretty good guess that TL7 Armor, Steel is RHA with a DR of 70 and weight multiplier of 0.56 and one system of Armor, Steel gives DR 10 on a SM +5 ship. IF we divide the ships surface area by 3 we get ~478ft^3 per ship section. Multiply that by 10 × 0.56 and we find that enough steel to give one section of the ship DR 10 weights ~2,676lbs which is right in the neighborhood of the needed 3,000lbs per system (in fact you get even closer if you round the radius of the ship up to 5ft even). In this case a spherical ship with the same volume would have roughly 3 times the DR for the same mass! Of course there are downsides to spherical hulls such as cost do to the increase waste in making anything circular but that might not be a problem at high TL's do to how advance 3D constriction techniques are likely to be by TL10 or definitely 11. Of course you can use to figure how DR would be effected by making the hull any shape you want with a little extra math though this is of course far more complexity then this system was built in mind with. Of course this being me we're talking about, I did a blog post were I pretty much tear apart the Starships system and let you play with it's gooey, gooey innards to your hearts content heh.
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GURB: Ultra-Tech Reloaded Normies: Man! The government is filled with liars and thieves! Me: Well yeah, here's what they're lying about, what they're stealing from you, and who's doing it. Normies: Rolls eyes Shut up conspiracy theorist Me: >.> |
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02-22-2019, 12:49 PM | #37 |
Join Date: Feb 2016
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Re: Spacecraft as homes [Spaceships]
Of course, such a spacecraft could not realistically have 1.5 metric tons of liquid hydrogen per component, as the volume of the liquid hydrogen would be around 20 cubic meters (over 700 cubic feet).
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02-22-2019, 01:14 PM | #38 | |
Join Date: Aug 2007
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Re: Spacecraft as homes [Spaceships]
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Again sorry if I just ddin't read you right but I really ciouldn't follow what you were doing.
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Fred Brackin |
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02-22-2019, 02:06 PM | #39 |
Join Date: Aug 2004
Location: Wellington, NZ
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Re: Spacecraft as homes [Spaceships]
That's why they divide the area by three - to account for an armour system only covering 1/3rd of the ship.
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Rupert Boleyn "A pessimist is an optimist with a sense of history." |
02-22-2019, 02:19 PM | #40 | |
Hero of Democracy
Join Date: Mar 2012
Location: far from the ocean
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Re: Spacecraft as homes [Spaceships]
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A ship for truly aquatic creatures would need a lot of water.
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Be helpful, not pedantic Worlds Beyond Earth -- my blog Check out the PbP forum! If you don't see a game you'd like, ask me about making one! |
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