Transwarp scale:

  1. 20 * Warp 9
  2. 30 * Warp 9
  3. 40 * Warp 9
  4. 50 * Warp 9
  5. 60 * Warp 9
  6. 70 * Warp 9
  7. 80 * Warp 9
  8. 90 * Warp 9
  9. 95 * Warp 9

Where Warp 9 is 1516c or 1.02 trillion mph.

Transwarp propulsion was first seen in 2369, on a Borg vessel of unknown design. Seems the rest is pretty much covered in the write-ups above.


Wonko, who probably knows more than I do, says Transwarp was first experimented with in Star Trek III with the Excelsior. So 2369 is probably when it actually worked
*sigh*. When am I going to learn to stay away from these things?