Seconded. And as long as it's transwarp, it's probably unknown - the same thing as when we today speak of "dark energy" and "dark matter" for lack of a more detailed model, or when describing a bunch of competing models. But when it becomes practical technology, it terminologically ceases to be transwarp, and the goalposts simply get moved.
Does Cochrane's warp drive require the ship to be moving fast or accelerating. Or can it be engaged in space while stationary as well. nuBSG style.
We see accelerations to warp from a standstill in the TNG era at least - but they are still accelerations, no matter how fast. Cochrane's first test rig accelerated more slowly before reaching "critical velocity", whatever that means, and the refitted
Enterprise also accelerated very,
very slowly when engaging her untested warp drive. Then again, nuBSG ships simply accelerate very fast! It's not as if they just "jump", disappearing at A and appearing at B - there's actual visible forward motion involved, for a split second.
Vulcan ship that surveyed Earth on 1957 most likely had warp as well.
Moreover, one of her crew was a "warp field engineer" by profession!
There was also a reference in "Space Seed" to some advancement in spaceflight technology that made sleeper ships obsolete.
And then came references to sleeper ships remaining in operation, at least two full centuries beyond that date. But those were interstellar sleeper ships - so it would make sense for the 2018 improvement in spatial drives to relate to inter
planetary flight exclusively. In which case a FTL breakthrough isn't a likely bet. Also, it takes a historian to inform Jim Kirk of the significance of 2018, so it clearly wasn't that big a deal in the grand scheme of things!
Timo Saloniemi