A bit late to this party - but what a great discussion so far!
This subject has been discussed many times on the board over the years and the ideas floated on this thread have added a lot to the conversation, especially as other properties (such as TAS) are now being more widely included.
The notion of "hot plasma" being a required component of the warp engines is a great explanation of the tech talk in
The Naked Time. As for the implosion stuff? Well, Spock does mention a "theoretical relationship between time and antimatter" - perhaps if you bombard antimatter with tachyons it reacts with cold plasma slightly out of temporal phase, safely funnelling away the worst of the uncontrolled explosion into a past time that never was?
Or, as Kirk much more succinctly puts it; "balance the engines into a controlled implosion"
Pipe Structure is the plasma manifold. Multiple output ports on the third M/AM reactor are directed into the bottom of manifold and funneled into one conduit of one concentrated warp plasma stream at the top of the manifold. The lower portion has divided plasma conduits at lower power for easier charge transfer to the ship's EPS Grid. The main warp plasma conduit runs to each warp engine, and also runs up into the saucer to directly power the Impulse Engines and other high power systems like phasers, shields and deflectors. A second pipe structure is in the saucer to down step the warp power stream into multiple divided streams for easier power transfer to the ship's EPS Grid, i.e. the reverse of its function in the engineering hull. Hence, two engineering areas with a pipe structure; one in the saucer and one in the engineering hull.
This I like because it helps explain the presence of the multiple tube structures on the ship. There is little doubt that that there are (at least) two Engine Control rooms on the Enterprise but the duplication of the tube structures as well makes little sense if they are solely a part of the warp drive (as suggested on many cutaways). Explaining the tube structure as a key part of converting the raw output of the reactor(s) into a form of energy compatible with ship systems makes a lot of sense though. Also, having the Impulse Engines also making regular use of the same raw power tallies nicely with how much they struggle when main power goes down, not to mention the synchronicity of the exact same engineering system in the TMP refit.
Energy conversion is also the role that I see dilithium crystals playing in the process, but they do it far more quickly and efficiently than the tube structure, especially for those high energy system essential for FTL travel such as deflectors, inertial dampeners and structural integrity fields. This is what I think happened in
Mudd's Women and
Elaan Of Troyius - the ship could technically engage the warp drive but without dilithium to harness power for those other systems it would literally be suicide. In both those episodes the usual backup option (a bypass through the
converter assembly) was out of action too. I assume this is also the problem in
The Paradise Syndrome when the tube area goes dark - without a power source for those key FTL systems, the Enterprise is stuck gliding along on backup Impulse Power only.
Finally, the non-central role of the dilithium crystals is why they can be popped out and inspected by Scotty without apparent disruption of ship systems - the converter assembly simply takes the load for a short time.
THE PODS
From
Metamorphosis:
SPOCK: Vaguely like a cloud of ionised hydrogen, but with strong erratic electrical impulses.
KIRK: We've got it.
SPOCK: Helm does not answer, Captain.
KIRK: Neither do the pods. Communications are dead. Building overload. Cut all power relays.
I know it's already been fairly well established that the nacelles are also referred to as "pods" in TOS, but this example further supports that notion since Kirk would hardly be talking about fuel tanks in a conversation about the navigation systems - they need to steer out of the way, pronto!
Something that not been touched on yet (I think) is what is being referred to in
That Which Survives as regards jettisoning the "pod" which will save the ship and doom Scotty. If the "pod" in question is just a section of the engineering hull it would have to include both the entire antimatter supply and the integrator - it's no good just ejecting the small tube Scotty is in without sealing the antimatter flow or it would continue pumping antimatter into the vessel and
BOOM!!!
However, if we take all the previous nomenclature in TOS to its natural conclusion then jettisoning a "pod" would equate to ejecting one of the nacelles. It would be a first for Trek but is an idea I've been toying with for a few years now. It would also explain why they didn't just do it in the first place, since the loss of a nacelle is a major handicap for the vessel and would certainly doom Kirk and the landing as the Enterprise would never reach them in time.
Alternatively, taking the "ejecting nacelle" theory a stage further; could the entire secondary hull have been jettisoned?
An early outline of TWS does mention this very scenario, as detailed in another thread by alchemist:
The matter-antimatter control is inoperative; it has been inexplicably and totally destroyed. Scott can fix it, if he begins now... but he might not have enough time. The area where he must work is tight and cramped -- room for just one man. Scott scrambles in and gets to work. The uncontrolled matter-antimatter mixture that provides warp power is almost out of control and will explode in ten minutes -- more or less. At this point, it's impossible to tell -- and just one man can do the job: Scott. Kirk clears the entire "disposable" warp nacelle area, moving all personnel into the saucer section. If they must jettison the nacelles, it is understood by both Scott and Kirk that Scott might not have the time to get out before the thing blows.
Interestingly, the first draft of the script mirrors my own theory pretty closely! I guess there are no new ideas under the sun
INT. CRAWLWAY - CLOSE - SCOTT
SCOTT
All right, Mr. Spock, I'm now opening the access panel to the magnetic flow valve itself. Keep your eye on the dial. If there's a jump in magnetic flow you must jettison me and the entire matter-antimatter nacelle immediately. It will blow in two seconds after the rupture of the magnetic field.
Knowing the way that script revisions tend to tighten things up (and how often they talk about jettisoning the mcguffin) it's hardly surprising that "entire matter-antimatter nacelle" got shortened to "pod". This is one instance where a little more tech-talk should have survived into the final script IMO