I seem to recall the issue in that episode was that over use of warp drive in general had the potential to damage subspace. The scientists in question lived on a habitable planet in the middle of the only safe passage through some giant radiation cloud or something, so that area was exposed to far more densely packed warp traffic than most areas of space would be normally. The damage to the subspace barrier accumulated faster with higher speeds but the damage was done with all current implementations of the idea. Star Fleet imposed the speed limit to try and slow down the damage while their scientists looked into a way of repairing it or creating cleaner warp drives, but they never really revisited the idea so who knows how far they ever got.Neverhoodian said:I'm not so sure about that. I remember a TNG episode where scientists were warning that ships traveling at faster warp speeds (the exact figures eludes me) were causing damage to subspace or some such technobabble. Turns out they were right, and Starfleet followed up by issuing a "warp speed limit" that was not to be exceeded except during emergencies. Hence the drop back down to lower warp numbers like 5 or 6. This was also before Voyager broke the fabled warp 10 barrier (and turned Janeway and Paris into Space Salamanders, who promptly spawned Space Salamander babies), so Captain Riker casually ordering "warp 13" in "All Good Things" was a real head-turner at the time.
In any case, if they did readjust the warp scale by the time it got too "All Good Things..." then like I said, I'd assume their definition of Warp 13 would probably be closer to what we'd think of as somewhere in the Warp 6 or 7 range. Just like how Kirk's idea of Warp 7 isn't the same as Picard's idea of Warp 7.
Exactly, the speed of Warp 10 in the TNG scale is the point at which the concept of warp drive requires infinite power to surpass. To go faster than that speed you need to turn to other mechanisms of FTL: transwarp, wormholes, the Caretaker Array, an Iconian Gate, Coaxial Warp Drive, etc.Antari said:Although Voyager coined the phrase transwarp in its episodes. Micheal Okuda the designer of the Enterprise-E described transwarp as any warp factor beyond 10 in the Enterprise-E technical manual. Which was a bit confusing as warp factor 10 was described as a barrier point of infinite power requirement. But as you noted in "All Good Things" Admiral Riker requests warp 13 be set while they return to federation space.
In the TOS era they didn't know that warp had an upwards limit, or at least they didn't know for sure where it was, and their ships would never be able to reach it regardless. So warp factors were defined as multiplied factors of speed up from the previous warp factor. Once they reached TNG, they knew what warp's top speed was, so they redefined the scale so that there were just ten warp factors between that top speed and whatever their slowest was. By the time we get to "All Good Things..." they probably just moved the numbers around so there were like 20 warp factors or whatever denominating the space between whatever the slowest speed was and that same top speed.
So Admiral Riker's Warp 13 would be considerably slower then Commander Riker's Warp 10.