08-03-2020, 11:33 PM | #21 | |
Join Date: Dec 2013
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Re: In which I post about a TL9 solar system
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Ultimately, though, Apple changing from x86 to Arm may be an indication that they are attempting to get around the soft wall of transistor size as much as practical. |
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08-04-2020, 12:04 AM | #22 | |
Join Date: Feb 2016
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Re: In which I post about a TL9 solar system
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08-04-2020, 12:27 AM | #23 | |
Join Date: Dec 2013
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Re: In which I post about a TL9 solar system
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Excuse me, need to revise that post about Brachistochrone Transfers and Ceres-Jupiter transfer stations... Edit: Done. |
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08-04-2020, 12:44 AM | #24 |
Join Date: Feb 2016
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Re: In which I post about a TL9 solar system
Anyway, 55 mps is around the best that you can do with a TL9 fusion rocket without compromising protection or capacity. If we assume one control room, one fusion rocket, three armor, and eight tanks, that leaves us with seven systems. You can try a two year mission without armoring the entire spaceship, but I doubt that anyone will come along for the trip.
If you are transporting human passengers at TL9, I would not really use anything less than SM+12 for interplanetary travel in the Inner Sol System or less than SM+14 for interplanetary travel in the Outer Solar System (radiation protection and spin gravity are required). At TL10, medicine can fix radiation damage and counter zero-g degeneration, and the propulsion technology improves, so you can reduce the minimum size to SM+6 and SM+8 respectively. |
08-04-2020, 12:56 AM | #25 | |
Join Date: Dec 2013
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Re: In which I post about a TL9 solar system
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That is good to know; however, it sounds like I'll need to hold off on designing crewed ships in general until I get Spaceships 5, if I want to take cosmic rays into account (which I do). Edit: I had a question which wasn't answered; cosmic rays have an armour divisor of (100); how does hardened armour affect it? B47 suggests the armour divisor becomes (10). |
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08-04-2020, 01:12 AM | #26 |
Join Date: Feb 2016
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Re: In which I post about a TL9 solar system
Cosmic radiation ignores Hardened, it is, by definition, Cosmic. More seriously, armor does not protect against radiation accept as extra mass, so Hardened is worthless against radiation, as cosmic radiation only divides PF by 100, rather than DR by 100.
With the fusion pulse engine, the problems are engine expense, reaction mass expense, and in-situ resource utilization. Advanced pulse engines cost twice as much as fusion rockets, which means that a single one would be 2/3 the cost of the vehicle. Hydrogen costs 4% the cost of nuclear pellets but produces 60% of the delta-v, so the fuel is 15× as expensive per mps. Finally, any refinery can turn ice into hydrogen, meaning that the spaceship could potentially refuel on its own or that colonies could resupply them easily, while nuclear pellets require a massive industrial complex to produce. Last edited by AlexanderHowl; 08-04-2020 at 01:24 AM. |
08-04-2020, 01:23 AM | #27 | ||
Join Date: Dec 2013
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Re: In which I post about a TL9 solar system
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...Yeah, there is a difference between $75 million to fill a 1.5kt fuel tank, and $3 million. I can see a government paying the former for their warships; but for a private enterprise, the latter fee is much more palatable. |
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08-04-2020, 01:55 AM | #28 |
Join Date: Dec 2013
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Re: In which I post about a TL9 solar system
It appears that, for cosmic rays, an active electrostatic field could provide "viable" protection:
https://ntrs.nasa.gov/archive/nasa/c...0090022229.pdf https://www.nasa.gov/pdf/718390main_...Protection.pdf |
08-04-2020, 05:05 AM | #29 |
Join Date: Mar 2008
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Re: In which I post about a TL9 solar system
Inspiration art, http://3mpub.com/mccollum/images/cloudsat.jpg art for The Clouds of Saturn by Michael McCollum.
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08-04-2020, 05:29 AM | #30 | |
On Notice
Join Date: Aug 2004
Location: Sumter, SC
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Re: In which I post about a TL9 solar system
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"The RISC ISA emphasizes software over hardware. The RISC instruction set requires one to write more efficient software (e.g., compilers or code) with fewer instructions. CISC ISAs use more transistors in the hardware to implement more instructions and more complex instructions as well." - RISC vs. CISC Architectures: Which one is better? Though this is no few lunch: "The RISC architecture will need more working (RAM) memory than CISC to hold values as it loads each instruction, acts upon it, then loads the next one." This explains why the A12z WWDC 2020 Special Event Keynote Mac had 16 GB of RAM compared to 8 GB one tends to se in the i5 and i7 low end Macs. IIUC one of the issues Intel is having at going below 14 nm is heat and in space heat is a problem as the only option for cooling things off is radiation. The x86 architecture hasn't exactly been cool (I still remember the jokes about the Pentium space hear with the very first PC to use that chip) If that is the case then Apple planned for the really long game as the A4 (2014) used a 45 nm process while its x86 (Haswell-DT) used a much smaller 22 nm process. The fact that the WWDC mac handled x86 optimized code as well as it did shows how far software has come (the RISC PowerPC chip's emulation was annoyingly slow)
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