"Anyway, maybe I'm missing something here, but I don't see how avoiding cab depots saves any space, really. If you don't have "spurs" or garages or some other dedicated space that's not needed for actual cab routing, then the alternative would seem to be the idea that all shafts are double- or triple-wide to allow cabs to "pass" each other — and that seems massively more space-wasteful to me than a few depots sprinkled here and there."
Well, I did qualify that "never" with a 99.9% ... but yes, I should have said "almost never." (I wanted to say "rarely," but that seemed to understate the near-perfect availability we consistently see.) Maybe it's only 99% or 98.5%, but rather than quibble about the decimals, can we agree that we almost always see immediate cab availability?Not so. There is at least one time that I can remember and it is from "The Naked Time".The fact that we never see anybody waiting for a cab
I'm not entirely convinced Kirk is really "pressing a button." Those don't look at all like buttons; they look like indicator lights. And the shoulder- or head-height placement is impractical: children, folks in wheelchairs, diminutive aliens — heck, even just short people — wouldn't be able to reach them. They present much more like a red-alert claxon (at the same height) or maybe "cab ready" lights than like any kind of control element.Or Kirk and Spock in WNMHGB? There was definitely a gap between pressing the button and opening the doors.
So basically you have depots, but they are decentralized and very small; essentially a one-cab depot at every terminus. I don't know whether that's more or less efficient than shared, localized multi-cab depots, but it's an interesting thought. Let's take it one step further:Actually, in my first TOS Enterprise deck plan drafts I had individual turbo lift access points next to the main turbo shafts. So in most cases, there's a cab waiting and just makes a quick turn to move into the main turbo shaft.
It's only when another turbo lift cab arrives that the standby cab has to move out of the way.
Thanks for the encouragement!Great essay and visualization!
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Also notice in this screencap that the "call buttons" seemed to carry some function
Not following you here: isn't every terminus a last stop for somebody?I think, however, that spare places for turbo lift cabs would mostly be needed near last stops.
Wow, that would require a ton of tightly-sealing valves throughout the shaft network: at least three at every shaft junction in the ship. Not to mention fans/vacuums installed in just about every segment. Pneumatics basically expect a single vacuum to suck the cargo along a single, enclosed route; they generally don't have junctions (other than merges from multiple entrances to the combined exit, so what I mean is, they generally don't have routing options).According to The Making of Star Trek the turbo lifts were supposed to be driven by pneumatic tube air and in "Wolf in the Fold" we witnessed a free-fall of the turbo lift cab with Kirk and Spock. It would appear that the cabs are "driven" rather than to have their own motion engines.
"Not following you here: isn't every terminus a last stop for somebody?"
"Pneumatics seems like a head-idea that falls apart when it hits the paper, but I'm happy to be corrected by a real engineer if I'm wrong."
Don't forget guys that they do have portable antigrav units and other exotic devices. Those cabs could have antigrav units to make them easy to move around and their own power and motive system (did they stop working when the ship was deprived of main power in "The Cage" or similar episodes?).
As I was showering for work this morning, the problems just kept piling up in my head. First, the object driven by air pressure has to travel along its long axis, bullet-style; you can't push a cab from the side, because once it tips just slightly, it jams against the tube interior. So you'd still need some means of registering the cab precisely against the tube, and once you have that then it might as well be your locomotion method as well.I don't think [pneumatics is] a credible idea either.
The fact that turbolifts need to continue to function when other ship's systems are down (and indeed we do see this in many episodes) suggests that they should use the simplest technology available, not the most complex.
The thing about force fields and antigravity is that they are slow. Dog slow. Think about all the times we've seen an antigrav sled or M-4 or Nomad slogging around at a top speed of 0.7 miles per hour. We can blame TV production again here; but also, when people's lives are at stake and collision avoidance is paramount, you can't really afford high speed or acceleration when there's no friction-based means of slowing things back down. Ever see a hovercraft stop on a dime? Me neither. Turbolifts need to be fast. Cheetah fast. Wheels can do that for us, safely and cost-effectively.
In the end, for believability, relatability, and (don't forget this one) good storytelling, we still see the ship's crew drinking good old-fashioned coffee from cups, washing their faces with water, bribing people, purchasing souvenirs, eating turkey on Thanksgiving, and having conversations about all kinds of mundane things that will still be part of the human condition even if we make it to the year 3,000. Like wheels.
All I'm saying is, the more complicated and power-hungry you make the turbolift system, the more likely it is to fail in a wider variety of crisis situations. It will always need power to run; but how much power, of what type, and on what other systems it depends are issues that seem worth considering.If I recall correctly the turbo lifts in ST II were "inoperative below C Deck" (reminder: for the movies they apparently changed the numbers for letters) as a result of the battle with Khan and in TOS "Let That Be" Lokai and Bele equally just could get down to Deck 3 ("C Deck ") and had to continue their pursuit down to the lower decks by means of (unseen) ladders and/or stairways.
Seems to me as if there are only turbo lifts connecting Decks 1, 2 and 3 which in case of an emergency have a separate backup power system.
Maglev technology only has to worry about gravity in one direction, and propelling one or two local trains forward on an essentially linear track that constrains the vehicle's path. The magnets are concerned only with propulsion and/or friction elimination, not steering or routing.What's wrong with good old magnetism? Back in the 60's the monorail was a big thing and I think a TV series of that era would have depicted futuristic elevators making use of that technology.
If you've got a way to position and microcontrol those magnets to handle all the acceleration/deceleration, lane changes, direction changes, cab reorientation for termini in different facings, etc., I'm not opposed to it. I suppose maybe the tubes are full of rails and the magnets are all over the outside of the cabs? Thus the cabs crawl along the tubes by pulling and/or pushing against the rails as a surrogate for wheel friction?But instead of wheels I'd favor monorail magnetic tracks.
The thing about force fields and antigravity is that they are slow. Dog slow. Think about all the times we've seen an antigrav sled or M-4 or Nomad slogging around at a top speed of 0.7 miles per hour. We can blame TV production again here; but also, when people's lives are at stake and collision avoidance is paramount, you can't really afford high speed or acceleration when there's no friction-based means of slowing things back down.
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M-4
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M-4 was a predecessor to the M-5 computer system.
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