Like I showed it seems in the 24th century the ships aren't designed for the kind of minimal maintenance you're describing.
I never said they were. I said that cruising speed is a velocity sustainable without requiring MORE than routine maintenance and upkeep for the engine systems. Meaning an output well within spec for all components involved that doesn't push any performance or safety limits.
Once more if the Enterprise D needed Starbase repairs just for traveling at high warp for days
High warp, meaning velocities considerably higher than cruising velocity.
Everything designed has a tolerance built in by the engineers. You're making the error that these designers and engineers PLAN for the design to be compromised and continue to work at optimal levels.
No, I'm saying that the standard tolerances for all engine components is what defines "sustainable cruising velocity" and that higher velocities that push or slightly exceed tolerances will invariably require checking and maintenance of the engines for damage. The system should not have difficulty reaching its specified norms after repairs have been completed, it's the
upper bound of its performance envelope that will see some reduction.
If we ask an engineer "how much pressure can the core take" He will give the tolerance that were built into and may even tell you how far above those limits you can go.
Okay.
So he tells you "upper range of tolerance for this one is three hundred and one point five atmospheres." Then the ship gets hit by the caretaker effect, takes some damage. Ship limps away to make some repairs. In the intervening time the engineering department has built FROM SCRATCH several shuttlecraft, two runabout-class vessels, tested several prototype propulsion technologies and even built an experimental
new warp core to test a brand new drive system.
Seven years later this engineer tells you again "upper range of tolerance is three hundred and one point five atmospheres," and you look at the operating record and see the reactor never once exceeded 200 and nearly exploded at 260.
Conclusion? The engineer is lying to you. Only he knows why, but considering how precise his line is he's probably been ORDERED to for some reason.
There is no way could possibly know with micro fractures that one of them wasn't potentially a breach waiting to happen in every situation of micro fractures unless you knew exactly how it was going to fracture every single time. Like tempered glass designed not to shatter.
If this was ANY OTHER SHIP BUT VOYAGER, you would have a point. These are, on the other hand, the same people who have repeatedly demonstrated almost borg-like industriousness in rebuilding the destroyed parts of their ship (even before recruiting an actual borg), and to assume that the only thing they never got around to fixing was the warp core strains believability, especially since the quotation of their "maximum sustainable cruising speed" appears AFTER they enter the delta-quadrant but no mention is ever made of engine damage or microfractures.
And you'd think somebody WOULD mention it, considering at their "sustainable cruising speed" they could have reached Earth in a little under eight years.
Except that Voyager routinely flies around at speeds around warp eight or nine, where pressures wouldn't be that much lower than warp 9.9.
Galaxy Class speeds, sure.
But Intrepid is more than 3x faster. According to the chart that is WAY more than merely three times the power.
Indeed, which leads us to wonder how a ship that is supposedly three times faster than a Galaxy class would suddenly be exactly AS fast as a galaxy class because of "damage to the engine."
They could rig their warp core to run a quantum slipstream drive but they couldn't reinforce it to operate at its NORMAL OPERATING TOLERANCES? That's like saying you can modify a lawnmower engine to run a gocart (which you ALSO built from scratch) but you can't build an actual lawnmower.
I'm just not buying that.
Voyager routinely runs at warp 6. It was said so many times in the series it's almost all that the ship seemed capable of doing. I would look at the episode Kes left because the Core was operating above 120%
Never stated an actual speed, but specifies it as some kind of Traveler-like warp speed.
Of course, in "Threshhold" the computer tells them "Warning: Nearing maximum velocity.
Structural collapse is immanent." No mention of the warp core there either, and no indication that this velocity is in ANY WAY sustainable.
Face it, dude. Starfleet fooled you. Fortunately, they also fooled the Tal Shiar and the Obsidian Order, which is probably the point.