kzt wrote:saber964 wrote:Weyland probably had a prototyping production line. A pro pro line is used to iron out potential problems in production of new systems like whether a part should be installed in step 76 or step 150 or module 16 installed in step 543 or in step 746.
The problem is that when you go to build this somewhere else every single part on your parts list doesn't exist. For example, you can't buy the pump that circulates liquid hydrogen to cool your antenna array because the plant that built it blew up, along with the machine tools that made it, the people who ran the machine tools and the people who designed the pump. It's perfectly possible that there are no existing design documents for that pump.
And that pump wasn't a random selection, it was carefully selected (and then that selection was verified by a highly experienced design engineer) from the universe of cryo pumps to both fit in the space, power and vibration budget, it was made by a reliable supplier and and was made by process that could supply huge numbers that were going to be reliable and made to spec.
Then that pump was extensively tested to determine that it actually would work under a wide range of possible situations, then it was tested as part of the antenna array, then the entire antenna array was tested as part of the guidance module, then eventually the entire completed missile, composed of thousands of these parts, was then extensively tested to ensure it worked under a wide range of storage conditions (temperature, vibration, gravity shocks, EMP, etc), operating environments, and under the kind of intense radiation you get in combat.
So now you have to select another model of pump, made by a range of vendors on another planet. What kind of relationship do you think the RMN and contractor design engineers have with the industrial supply base on Beowulf compared to the one on Manticore that has been obliterated? Who are the reliable vendors? How long will it take to find another pump that has all the correct specifications, can be produced in huge numbers soon, and will it be within spec? Then it has to go through the entire qualification process.
This goes on for every single part of the missile. It's why we can't build a Saturn V today.
That's quite true for today's manufacturing capability. In two thousand years, might manufacturing have learned something? Like massive improvements to 3D printing that would make building lots of things as simple as loading the files, pushing a button and waiting for the result to come out?