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In the episode The Changling Spock says that an incoming energy burst from an unidentified source is approaching at

"Warp 15".

Does this mean that the TOS warp scale was different to the cochrane scale or was this a writer's oversight like I suspect it to be?

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If you've got multiple questions, you should make multiple posts; – Valorum Apr 6 '14 at 12:36
@richard thanks captain obvious. However both questions were pertinent to the episode I was referencing and enquiring about. I will reinstate the original questions in the morning. – MrDobilina Apr 6 '14 at 21:11
up vote 4 down vote accepted

You're confusing "transwarp" (TNG/VOY) with "multiwarp" (TOS/TAS).

In the original Star Trek, the maximum velocity the Enterprise was capable of travelling safely at was Warp 10 but this didn't mean that speeds faster were impossible to reach.

In several episodes of TOS, the Enterprise and various other items travel faster than warp 10 both with and without alien assistance;

  • Journey to Babel - The Enterprise encounters a ship capable of travelling 'faster than Warp 10'

  • Let That Be Your Last Battlefield - The Enterprise exceeds Warp 10

  • The Changeling - The Enterprise goes to Warp 11, Weapons travel toward them at Warp 15

  • By Any Other Name - The Enterprise travels at Warp 11 with no ill affects

In TNG, the scale was recalibrated to make Warp 10 essentially unreachable. Speeds in excess of (approximately) 3000 times the speed of light are described as "transwarp speeds".

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My recollection is that the TOS Enterprise's top speed under normal circumstances was warp 8, and the maximum safe sustained speed was warp 6. – Keith Thompson Apr 6 '14 at 20:12
@KeithThompson - In "By Any Other Name" Scotty pushes it up to 11 without any special help from outside. It's just another way of saying "unsafe speed that tends to shake the ship apart" – Valorum Apr 6 '14 at 21:13
I thought the Kelvans modified the ship to make that possible. – Keith Thompson Apr 6 '14 at 21:18
@KeithThompson - I stand humbly corrected. It's been forever since I've seen that episode. Either way, Warp 11 was achieved? – Valorum Apr 6 '14 at 21:22

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