Zontar said:
We've all seen it, be it a movie, a show or a book in a sci-fi setting where some technology is shown once or in the background which should change everything, yet doesn't.
I'll give two examples of this to illustrate what I'm saying: first is from Star Trek. In Next Generation we where introduced to replicators, which make pretty much anything by rearranging matter into food, cloths, equipment or whatever. Now it is a new technology that was introduced to the world of Trek in the early seasons of Next Gen, and it's far from perfect with objects that are not capable of being replicated and food having a noticeable taste difference, but that doesn't explain why by the end of the 14 year era that is Next Gen we aren't seeing them used to their logical conclusion. While the federation was in a race to build more ships due to plot related events, we never see ships or ship components being built in the few instances we see federation shipyards, we see them being built the old fashion way. Even in the middle of the Dominion war, when industrial replicators should have been pumping out defiant class ships at the hundreds by the day, instead conventional construction is still being used. I don't care if conventionally built ships have better quality, that just doesn't make sense. That says nothing of the horrifying possibilities Section 37 would have given how they could logically make people with replicators. An instant clone made from a bit of biomass.
Yeah, I understand that. There are valid plot reasons for it, because as the TNG technical manual puts it, if you can build a starship at the push of the button, it takes all the drama out of things, and why would you even care at that point if a few get blown up?
In-universe it seems replicators suck up a lot of power, but there also just seems to be a scale issue. It seems even an industrial replicator is more along the lines of a device for making stuff about the size of a fridge, not giant objects like spaceships...
The energy issue is a bigger point though. Consider I once had a discussion that raised the point of why voyager had so many shuttles.
The argument came up that perhaps they were replicating new ones, which someone countered by saying, 'well if they can replicate a shuttle, why couldn't they replicate new warp coils?'
But there's an obvious step missing here. The technical manuals aren't canon, but they do give hints as to the nature of the potential problem.
Not only do the replicators require energy to run, but they can't make matter out of energy. They make objects out of raw matter. (There's arguments about whether they can transmute elements. I would say yes, some disagree though)
A type 6 shuttlecraft has a mass of about 3.5 tonnes... (3.38 according to the tech manual).
The Enterprise D has 36 warp coils, which collectively account for about 25% of the total mass of the ship. (each coil is actually said to be a pair of 2 half-coils) A single such pair is said to have a mass of 34,375 metric tons.
That's the same as about 10,000 shuttlecraft...
Given that the replicator is a matter rearangement device rather than an energy to matter converter, it starts to be obvious for these reasons alone why a starship could not feasibly replicate parts for itself.
The amount of raw matter required would be insane.
Equally, if you were to try and replicate an entire starship, for most designs you'd have to do so in orbit, and you'd have to ship sufficient mass to the replicator to construct the entire ship.
At what point do you decide that this is a more effective method than manufacturing the parts elsewhere and assembling them onsite?
(And how many parts are manufactured using traditional techniques, and how many are replicated? Just because they aren't replicating whole ships, doesn't really tell you how the parts are made...)
Still, replicators as a whole are always an incredibly troubling technology in any setting. Writers rarely think through all the consequences implied by their existence. The Federation at least covers the economic effects somewhat given that it's not operating a capitalist economy... Because a replicator would mess up an economy pretty quickly...
Ahem. That aside, let me see if I can think of anything else, given that wasn't really the point of the thread... XD
Aah... Nope. I don't ever seem to think of anything when it comes to it... Silly me... >_> XD