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Originally Posted by ranb
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Originally Posted by Astronot
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Originally Posted by truthufo
410 Days is not long enough to even go to mars.
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A physicist that is working on the engines for NASA’s mission to Mars told me that if NASA could give him a reactor from a nucular[*] submarine ..... They plan to use electric engines that heat gas to very high temperatures and pressures and expel it for the main propulsion. .....
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Who is this physicist?
Do you know how much a reactor from a nuclear powered submarine weighs? You can not just use the bare reactor vessel along with it's core. It depends upon coolant pumps (also electrically driven) to transfer heat to the steam generators which produce steam for turbines. The entire primary plant is enormous and while I am not sure, I think it would take several Saturn V rockets to get it into orbit. Since the core is made from a non-steel alloy with a rather low melting point compared to steel, it does not operate at high temperatures. The coolant (water) coming out of the reactor is less than 550 F, and the fuel peak centerline temp is going to be less than 1500 F. I guess putting up a few turbine generators might take care of the power problem, but they weighs tons also. Even the newest Virginia class sub reactor is not able to generate electrial power directly. It is just a small heat source for the steam generators.
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The Saturn V had a capability of putting 118 metric tons into LEO. The power units for certain submarines have masses of about 73 metric tons. However, that 73 metric tons is just for the core, pressure vessel, closure head and related structurals, control rods, control rod drive mechanisms, and assorted instrumentation. It does not include the piping, the generator(s), or the coolant, which, when added to the power unit mass, would probably be a total close to the Saturn V's limit for LEO mass. That's just for the electrical power generation unit.
So, as you wrote, we're looking at several Saturn V launches to get the spacecraft into orbit. Then begins the assembly process.
BTW, there's also the
Kaku factor...
*not just Texas,
Astronot, but also Mississippi, Alabama, Georgia, South Carolina, and Tennessee. Probably Arkansas and North Carolina too, but don't have verified evidence at this time.