Thanks for this, I knew that someone round here would have the answer!Back in the day I gave this explanation to how things worked on a Navy ship I served on. If the Enterprise is following a day/night schedule, then only the watch-standers would be up at night. And the watches would be dogged so that watches rotated (No one permanently stuck on a midwatch, for example.)

I'm sure it's no coincidence that both the secondary hull and the area above the Impulse Engines have the same odd shaped hatches - this is clearly suggesting a maintenance hatch of some kind, both to do with the engines.I was thinking about the underside hull markings/hatches. The grey odd-shaped one looks like you could drop the pipe cathedral (non-FP) through it. If the pipes are located above it with the front of the pipes in front on the odd shaped grey hatch, and it sits about mid-deck in the hull, you could disconnect the rear point and let it swing down using the front as a pivot point. Of course, you need to clear out a path through the lower decks to the bottom of the hull. The pipes could lay down at an angle (45 degrees in my illustration) and still slide out through the hatch. The odd shape is a rough match to the pipe cross-section geometry. None of the other hatches are able to do it for a pipe replacement. (Or you can just open the back wall and slide it out through the shuttlebay?)
Here a rough scaled sketch of the pipe cross-section (my concept of it, but it is close no matter) over each hatch (90 degree position, standing on end). If you lay the pipe structure down on an angle (45 degrees), it elongates the hole needed to accommodate the cross-section. The grey odd-shaped hatch might do it:
Pardon my artwork. Or this is just a crazy idea.![]()
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I'm not sure why you'd need to rapidly eject the pipe structure though - aren't they just conduits for the energy generated by the main reactor(s)? I can certainly see a need to eject an overloading reactor, assuming it was within the tech limitations of the time!
I said that quite flippantly upthread, but dialogue from The Apple suggests that separating the saucer is perhaps complex and certainly extremely dangerous, perhaps only to be used as a last resort.Could the Klingons have jettisoned the saucer? It didn't appear that they had any control over the ship other than the illusion that they could suffocate Kirk & co.
KIRK: Status report, Scotty.
SCOTT: No change, Captain. The orbit is decaying along computed lines. No success with the warp drive. We're going down and we can't stop it.
KIRK: I'm sick of hearing that word can't. Get that ship out of there.
SCOTT: Sir, we're doing everything within engineering reason.
KIRK: Then use your imagination. Tie every ounce of power the ship has into the impulse engines. Discard the warp drive nacelles if you have to, and crack out of there with the main section, but get that ship out of there!
SCOTT: Sir, I'm going to switch over everything but the life-support systems and boost the impulse power, but that's just about as dangerous.
SCOTT: No change, Captain. The orbit is decaying along computed lines. No success with the warp drive. We're going down and we can't stop it.
KIRK: I'm sick of hearing that word can't. Get that ship out of there.
SCOTT: Sir, we're doing everything within engineering reason.
KIRK: Then use your imagination. Tie every ounce of power the ship has into the impulse engines. Discard the warp drive nacelles if you have to, and crack out of there with the main section, but get that ship out of there!
SCOTT: Sir, I'm going to switch over everything but the life-support systems and boost the impulse power, but that's just about as dangerous.
It seemed to want to flee from the "good vibes" in the Engine Room as quickly as possible, but if all that Deck 6 &7 dialogue is to be believed, it did not take a direct route out of the ship. Why?Maybe the alien was acting on reflex even though what it did was so detailed, and it was drawn to the power flow also and headed down the neck and secondary hull as it left?
We know the Pinwheel alien can put hateful thoughts into people (although this can be beaten with willpower) and it can transmute phasers into swords (no doubt replacements can be manufactured easily enough for next week's episode).
These are one-time transformations that the crew themselves can overcome. But what about the indestructible bulkheads? They are gone by the next episode and if they had been permanently transmuted by the alien then I doubt it would have bothered to turn them back on its way out. Ergo, it was a temporary situation, caused by a temporary phenomenon (alien), more akin to a forcefield than an ultra dense metal. Since the way the alien is presented in the episode is that it needs to be physically in a certain location in order to benefit from "bad vibes" or influence something, it wouldn't be able to remotely project the forcefields from elsewhere in the ship - the alien (or a portion of itself, acting independently) would need to take up "guard duty" on those entry points - one at every door which a member of the crew could potentially try and cut through, while a "seeker" portion stalks the corridors, soaking up the bad feelings.
Interestingly, the point of exit on the secondary hull is almost exactly where a turboshaft might come out if dropping vertically through the dorsal.

I could really cheeky and point out how large the pinwheel is when it exits the hull, suggesting a larger, rejoined form - however, the issue of scale is a whole other debate

If you have the tube structure as a FP set piece then 947' vessel length is OK. If the goal was to fit in the Engine Room and non-FP tube structure then a 947' long vessel is just a bit too tight to permit that without some very strange positioning of decks, as @blssdwlf found out:Also, I found this older post dealing with a resize of the refit and original Enterprise. If the ship were scaled-up as described, would that account for fitting the 2-level engine room into the available area of Deck 6 and 7 of the original Enterprise?
https://www.trekbbs.com/threads/tos-enterprise-wip.119751/page-3
However, a small length increase to 1,060' or 1,080' should be enough to fit the Engine Room and pipe structure into the saucer.
Bigger just makes the refit process more believable IMO

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