Transwarp scale:
- 20 * Warp 9
- 30 * Warp 9
- 40 * Warp 9
- 50 * Warp 9
- 60 * Warp 9
- 70 * Warp 9
- 80 * Warp 9
- 90 * Warp 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?