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Reverse Impulse

@Mytran: :techman:

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As far as the classic warp formula goes, I just thought I'd mention it. I know that what's on screen doesn't really support it.

One-half light speed is as good a guess as any, but there are no canonical reference as to how fast warp .5 is as far as I know, even that.

The classic cube-formula seems to exist just to give fans, or at least some of the fans, a feeling that there is a science-y aspect to the show, but it really is just techno-babble, with the emphasis on babble.

This is one of the reasons why I'm not terribly concerned with hard engineering issues in Trek with an overemphasis on canon. Intent is a much more reliable guide than what's on screen, e.g. since in the case of speed on screen things almost always move exclusively at the speed of plot. That may lead to discussions where things don't align precisely with what's on screen, but it also opens the door to more consistent conceptions of what the fantastic technology might involve. Not that that means that the classic warp-formula is supposed to hold either.

I'm not as familiar with TNG era canon as I am with TOS canon, but I'd be very surprised if the revised warp-formula was consistently applied on screen through all of TNG, DS9, and VOY.
 
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Interesting...so, an Impulse Engine is just the mechanism by which the overall mass of the ship is lowered, thus permitting the regular thrusters to propel the ship at more and more fantastic speeds? That's certainly food for thought! :techman:

This is how I always thought it worked.
 
Lots of good points made here, and it's frustrating that there isn't more hard canon to support it. Here's my take though, and please do correct me if you disagree :)

The Impulse System as a whole consists of a series of fusion reactors (augmented by the main M/AM reactor/warp core, but not dependant on it), a set of driver coils to reduce the ship's mass and do some subspace trickery, and some impressive looking glowie exhaust ports that may or may not generate actual thrust.
I'm not quite sure what "full impulse" would actually look like from a technical perspective, but I'm assuming it means the driver coils are running at 100% strength and the exhaust ports are outputting maximum pressure (if they do that).

The impulse deflection crystal is an interesting one, because as far as I can see it's only a significant feature on TMP/TWOK era ships. There's no canon reference to fall back on other than its name alone, so I would conjecture that on TMP/TWOK ships it's actually part of the driver coils. It's the right sort of donut shape, and the glowing part could be the field emitter for the subspace field that lowers the ship's mass.

I'm just about to start constructing the impulse engines on my Refit build, so I'm keen for it to make at least a small amount of sense :P
 
The deflection crystal thing is purely "backstage", with no onscreen hints as to what the doodad does (even the fight where Khan loses one tells us nothing, because he has a spare on the other side of his ship). However, one might put the different backstage takes together to comply with the canon stuff, for example this way:

- Shane Johnson says the crystal of the TOS movie ship(s) allows the main power of the ship to be translated to sublight movement.
- Doug Drexler says the crystal (or dome or whatnot) of the ENT ship(s) manipulates the warp field of the ship.
- DS9 tells us that subspace fields are the way to go to manipulate inertial mass.
- Okuda and Sternbach say that inertial mass manipulation by engine-internal means was a big thing in the Ambassador class, as opposed to her immediate predecessors.

Now, Ambassador is what comes after the TOS movie ships and their domes. She herself lacks any blue-glowing bits near the impulse drive (even though the E-C nozzle itself glows blue, apparently because seriously damaged as "normal" Ambassadors glow red there). Perhaps Starfleet every now and then assigns the vital mass-reducing function to the main warp field, accomplishing this through the blue crystal, but occasionally applies internal mass-reducing coils instead, there being assorted tradeoffs?

The TOS hero ship would be a mature and refined product with internal coils; her refit would be a haphazard compromise. The Ambassador would again radiate the maturity and stability of her era, while multiple exposed domes would pop up on the Defiant, built as a desperation measure.

As I wrote before, these are specifically TOS observations that Impulse could be used at FTL speeds.

It takes special effort to see FTL impulse there, and even then this cannot be argued to have been a deliberate writer intent. Even though all the writers' bible stuff about the nature of warp and impulse postdates some of the earlier adventures involving the issues, the idea seems to have been there from the get-go.

- In the second pilot, nothing about "days away -> years away" suggests FTL impulse: quite the opposite, really, in making impulse several orders of magnitude slower than the default drive. And nothing about "old impulse engines" necessitates a belief in their FTL capacities: traversing the barrier at STL seems eminently doable, and need not be related to the general means of motion of the Valiant (which is obscured by the fact that the storm did a lot of said moving, and only warrants debate on the exact degree of "a lot").
- In "The Deadly Years", no suggestion is made of the Romulans being limited to impulse. Nor is there such a suggestion in "The Enterprise Incident". Simple impulse just isn't a Romulan thing - indeed, in the first episode dealing with the culture, the very point is that the only "Romulan thing" the heroes know about is the pennant art, and everything else is dealt with on an ad hoc basis, with assumptions dropped as events warrant.
- In the second movie, Khan's ship is very much "called" on matching speeds for the fight. Whether Kirk remains at warp five at that point (that is, the point where the "12 hours remaining" is established) is the debatable part. Since we hear nothing about slowing down, the default assumption is that Kirk had indeed slowed down already - otherwise the fight could not take place as shown. Thus, 12 hours to target at regulations-mandated moderate impulse, vs. the undefined number of hours to target at events-warranted haste, offers us no conflict and no hint of FTL impulse. (And do note that Kirk flying towards Regula at warp 5 already tells us he is in no real hurry, when his new ship is known to be capable of warp 7 at the very least.)

TNG and later Trek mostly kept to the decision to make Impulse sublight-only although they goofed in "BOBW2".

Or then it's time dilation at work, just as in ST:TMP. Which is fine and well, because those two adventures would be the only ones even theoretically capable of featuring the concept (what with a star system where the milestones are indeed set in stone, rather literally), yet conversely the "featuring" requires absolutely nothing from the writers.

Timo Saloniemi
 
Everything I've read is that they intentionally limit it to .25c for some reason.

Mostly to avoid Time Dilation & relativistic effects when in Sub-FTL speeds.
Yes, the decision that non-warp sublight speeds should be limited to roughly 1/4 lightspeed was made for the practical reason of saving math: as speed increases the effect on the perception of time increases, but at 1/4 lightspeed and below the effect is fairly minor.

Time_dilation.svg


And yes, if Impulse Engines are rockets then something must be messing with the physics (like lowering the mass of the ship) or else ... assuming the propellant leaves the ship at lightspeed (which is kind of silly already), the ship would use about 20% of its mass to reach "full impulse" (1/4 light speed) once.
 
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And nothing about "old impulse engines" necessitates a belief in their FTL capacities: traversing the barrier at STL seems eminently doable, and need not be related to the general means of motion of the Valiant

From "Is There In Truth No Beauty":
SPOCK: Unfortunately, we lack reference points on which to plot a return course. We experienced extreme sensory distortion, and we shall do so again if we attempt to use warp speed. And we cannot re-cross the barrier using sub light speed.

- In "The Deadly Years", no suggestion is made of the Romulans being limited to impulse. Nor is there such a suggestion in "The Enterprise Incident".

Nor is there a suggestion that the Romulans were using warp drives in "The Deadly Years". But what we do have is that a simple impulse Romulan ship required the Enterprise to go to maximum warp to chase it down in "Balance of Terror" suggesting that the speed difference isn't always significant.

In "The Enterprise Incident" the Romulans are sporting fancy new Klingon designs which we've seen as Warp capable.

- In the second movie, Khan's ship is very much "called" on matching speeds for the fight. Whether Kirk remains at warp five at that point (that is, the point where the "12 hours remaining" is established) is the debatable part. Since we hear nothing about slowing down, the default assumption is that Kirk had indeed slowed down already - otherwise the fight could not take place as shown.

It takes special effort to pretend that TOS ships at warp and impulse can't fight each other. Since we hear nothing about the Enterprise slowing down, the default assumption should be that the Enterprise didn't slow down. V'ger at warp in TMP didn't slow down and the Enterprise cruised up and maneuvered closely around it while making contact.

(And why would Kirk slow down to sublight 12 hours away when he could arrive in minutes if he stayed at FTL? We saw the Enterprise warp away from inside the Mutara Nebula so it isn't like they are in a no-warp zone.)
 
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I'm just about to start constructing the impulse engines on my Refit build, so I'm keen for it to make at least a small amount of sense :P

I think you're on the right track. Sometimes the best ideas come from putting it together to see if works for you and you can always revise it. :techman:
 
From "Is There In Truth No Beauty":
SPOCK: Unfortunately, we lack reference points on which to plot a return course. We experienced extreme sensory distortion, and we shall do so again if we attempt to use warp speed. And we cannot re-cross the barrier using sub light speed.

Okay, I stand corrected.

Still doesn't mean the Valiant would have crossed the barrier at impulse. Impulse engines are only mentioned in connection with the magnetic storm, after all - so the STL impulse interpretation, the preferred one, is that old impulse was bad at fighting such storms, new impulse is better, but both old warp and new warp are right out.

After all, the "old" bit is there. And Kirk's new ship still has impulse engines, presumably new ones, in addition to warp. Just as with every Trek ship, and arguably the Valiant as well.

Nor is there a suggestion that the Romulans were using warp drives in "The Deadly Years".

Or that Kirk is a human, or the Romulans are not. But, default. We know Romulans can warp. You cannot use "The Deadly Years" as support to the contrary claim.

But what we do have is that a simple impulse Romulan ship required the Enterprise to go to maximum warp to chase it down in "Balance of Terror" suggesting that the speed difference isn't always significant.

You can't have it both ways. The heroes say the difference is significant, and they say simple impulse. You can say they were wrong on one or both, of course, negating your claims just as certainly as in the scenario where they are correct on both.

Yet Kirk using maximum warp is related to neither here. He isn't chasing the slow ship, but backtracking the flight from the fast weapon.

In "The Enterprise Incident" the Romulans are sporting fancy new Klingon designs which we've seen as Warp capable.

In one version of the story, yes. But again, this cannot be used as evidence for sublight Romulans in any fashion.

It takes special effort to pretend that TOS ships at warp and impulse can't fight each other.

Not really - all that is required is opening one's eyes. Apart from "DDM" and its lumbering ships, TOS fights never show the two fighting sides in the same frame, for obvious reasons. TWoK shows us all, in revealing closeup. Kirk isn't at warp when Khan rakes his ship from fifty meters away. Why should we think otherwise, even if we could?

Since we hear nothing about the Enterprise slowing down, the default assumption should be that the Enterprise didn't slow down. V'ger at warp in TMP didn't slow down and the Enterprise cruised up and maneuvered closely around it while making contact.

But here Khan is said to be slowing down. How can we derive a scenario where Kirk would be and remain at warp for his rendezvous-of-mercy and subsequent fight? And why would we want to?

(And why would Kirk slow down to sublight 12 hours away when he could arrive in minutes if he stayed at FTL? We saw the Enterprise warp away from inside the Mutara Nebula so it isn't like they are in a no-warp zone.)

As said, Kirk initially is in no hurry. Ultimately, he is. We know he is taking it slow originally, what with warp five and all. The question only goes, how slowly? And with all those children aboard, we have our excuse for ignoring this ill thought out bit of dialogue and maintaining that impulse is STL. As usual.

Timo Saloniemi
 
Still doesn't mean the Valiant would have crossed the barrier at impulse. Impulse engines are only mentioned in connection with the magnetic storm, after all - so the STL impulse interpretation, the preferred one, is that old impulse was bad at fighting such storms, new impulse is better, but both old warp and new warp are right out.

Since you're clinging so tightly to the post-TOS/TNG-continuity interpretation that impulse is strictly STL I'm curious to see how you are going to spin this wrinkle?

"First Contact" - Earth's first warp ship flight is 2063.
"Where No Man Has Gone Before" has the Valiant missing for "over two centuries". Post-TOS/TNG-continuity puts Kirk's 5-year mission at 2265.

So you're saying that the SS Valiant had an awesome warp drive, even better than the one that NX-01 Enterprise's first Warp 5 Drive that would come along 80 years later? And that's ignoring the obvious question of why didn't Kirk or Spock say the "old warp drive" wasn't strong enough when the answer is that the Valiant didn't have one.


We know Romulans can warp.

Before "The Enterprise Incident"? That's untrue. We know the Romulans in "Balance of Terror" can fire torpedoes that can chase down the Enterprise at warp speed. But there is no dialogue or indication that they have warp drive. And that is true in "The Deadly Years" which there is no dialogue that points to a warp driven Bird of Prey. Klingon-style battlecruisers, OTOH there is.


The heroes say the difference is significant, and they say simple impulse.

I don't think you can quote what that "significant difference" is. I'm just saying that is isn't always that significant. The only evidence we have is that Warp is faster than Impulse in combat. But I doubt you can provide evidence where the "heroes say the difference is significant". That's just your interpretation.

SCOTT: No question. Their power is simple impulse.
KIRK: Meaning we can outrun them?
STILES: To be used in chasing them or retreating, sir?
Yet Kirk using maximum warp is related to neither here. He isn't chasing the slow ship, but backtracking the flight from the fast weapon.

No, he's chasing the Romulan. The Enterprise has already backtracked from the flight and is back on the Romulan's sensors. Before they go to maximum warp they are one minute away from the Neutral Zone *pacing* the Romulan. Once at maximum warp a little over 40 seconds go by and Styles announces that they are 20 seconds away from the Neutral Zone. That would tell us pretty clearly that at impulse, the Romulans were going pretty fast and the Enterprise's warp advantage isn't as significant as you make it out to be in this case since their ETA to the zone hasn't changed much.

ROMULAN: Commander, the reflection returns.
COMMANDER: Activate our cloak.
ROMULAN: Commander, our fuel runs low.
COMMANDER: Quickly!
DECIUS: The Earth vessel? Impossible.
ROMULAN: It moves as we move.
COMMANDER: Its commander is not one to repeat a mistake.
...
STILES: We'll enter the Neutral Zone in one minute, Captain.
...
SPOCK: We're still on our side, Captain.
KIRK: Let's get them while we are. Before we enter the Neutral Zone. Full ahead, Mister Sulu. Maximum warp.
SULU: Ahead, sir. Maximum.
...
COMMANDER: Evasive action. The Earth ship again.
...
STILES: Twenty seconds to Neutral Zone, sir.
KIRK: Lieutenant Uhura, inform Command base, In my opinion, no option. On my responsibility, we are proceeding into the Neutral Zone. Steady as we go, Mister Sulu. Continue firing.​

Apart from "DDM" and its lumbering ships, TOS fights never show the two fighting sides in the same frame, for obvious reasons.

Uhm, you do realize that in the "Doomsday Machine" that the Enterprise at the end is on impulse and is fighting and running from the machine that they could barely stay ahead of when they had a working warp drive?

TWoK shows us all, in revealing closeup. Kirk isn't at warp when Khan rakes his ship from fifty meters away. Why should we think otherwise, even if we could?

Not even close, Timo. TWoK showed us the same scenario TMP showed us, a ship coming on side another one traveling at warp and go around it, just a ship's length away. Why we should think that they can't when the previous movie did just so (and episodes before that) is just being silly, IMHO. :)

TOS FTL Impulse, as usual :techman:
 
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And yes, if Impulse Engines are rockets then something must be messing with the physics (like lowering the mass of the ship) or else ... assuming the propellant leaves the ship at lightspeed (which is kind of silly already), the ship would use about 20% of its mass to reach "full impulse" (1/4 light speed) once.
That's why I think Impulse engines are closer to "Ion Drives" in technology than a simple Chemical Rocket or even whatever a Fusion Rocket is.

But anyways, I think the reason they call it "Impulse Engines" or "Impulse Drives" is because it's a Hybrid system.

Gravimetric Drives or some form of Gravity Manipulation for OMNI directional maneuverability, albeit not as fast as you would want it to be, and some form of direct thrust mechanism (Ergo the Red Impulse Exhausts) are for straight line forward propulsion to travel at it's fastest possible speed while under STL while using the minimum amount of resources to do it.

And they intentionally limit it to 0.25c to not suffer relativistic effects.

If in the future, they want to travel at 0.25c - 0.999999999c, then they would need a "Hyper Impulse" system which would be some form of combination of Chief O'Brien & Dax's shield configuration for lowering "Inertial Mass" of the vessel while traveling in normal space & some form of Static Warp Shell that is a Warp Field that isn't moving the vessel, but actually protecting it from the relativistic effects of traveling at > 0.25c.

That's just my hypothesis, what do you guys think?
 
Since you're clinging so tightly to the post-TOS/TNG-continuity interpretation that impulse is strictly STL I'm curious to see how you are going to spin this wrinkle?

Why should I? It's utterly irrelevant to the issue at hand.

The Valiant explicitly achieved the impossible. That is, she did not have the means to achieve what she did. Something else thus provided those means. It is fruitless to involve the propulsion system(s) of the Valiant in this issue, as they by definition are not pertinent.

...What are you trying to say here anyway? That "old impulse" is orders of magnitude better than "new warp"? Just drop it.

And that's ignoring the obvious question of why didn't Kirk or Spock say the "old warp drive" wasn't strong enough when the answer is that the Valiant didn't have one.

If one says "old" in this manner, the direct implication is that there is a "new" now. That is, the "new" impulse drive would not be so severely handicapped in fighting the storm. Warp is not pertinent.

The same as with Spock's "Romulans and Earthlings once had primitive atomic weapons and vessels": Kirk supposedly has the modern equivalents.

Before "The Enterprise Incident"? That's untrue.

No, it's true. That is, we are told that Romulans have warp in the 2150s. We are never told that they would not have it in the 2260s.

Indeed, TOS never tells us that X would lack warp, for any value of X. They may be stated to have something, but they are never stated to lack warp if they do FTL. Which makes things a lot simpler overall.

The end result? FTL travel (barring "shortcut drives") in Trek is called warp. Sometimes it involves exotic engine types, but none of these is called "impulse", either in TOS or in any other show.

But I doubt you can provide evidence where the "heroes say the difference is significant". That's just your interpretation.

So you are saying the categorical ability to outrun the enemy is insignificant? Whatever. The heroes see significance. They may be wrong, although in the episode they aren't proven wrong on that point. There is no scene where the Romulans would be about to outrun our heroes or otherwise come close to matching the hero speed.

This regardless of whether they really move at impulse or not. The episode is neutral on that; all we know is that the categorical ability to outrun persists throughout.

No, he's chasing the Romulan. The Enterprise has already backtracked from the flight and is back on the Romulan's sensors.

This would involve going to maximum warp at some earlier timepoint, in order to achieve the backtracking. From the dialogue, it's clear the hero ship is not at maximum warp to begin with; also, it is at a great distance, too great to ensure hits, which was not the case during earlier shadowing scenes. So the pacing happens before the backtracking, and the backtracking happens as we observe it happening, that is, during the scenes you quote.

The time for stealth is over. But it is only over when the Romulans are back on their own doorstep and all hope of a velvet glove handling of them is lost. So Kirk's destroyer escort makes the dash against the vastly slower sub, the dash she always was capable of but previously had no tactical use for.

Uhm, you do realize that in the "Doomsday Machine" that the Enterprise at the end is on impulse and is fighting and running from the machine that they could barely stay ahead of when they had a working warp drive?

I do. Do you?

When ships in TOS (or in Star Trek, which is not split into utterly dissimilar parts the way you think it is) appear in the same frame, they are at impulse. Except when

1) there is a warp chase going on, with the telltale feature of both ships having their noses pointed the same way, which is not the case in TWoK, or
2) the warp fields (or indeed the vessels themselves) are nested, which only ever happens with vast superenemies like V'Ger or the Borg, and never in TOS.

(In "DDM", the heroes are "barely" staying ahead of the opposition by their own choice, as evidenced by them invariably achieving the staying ahead, even when their ships are shot to hell and moving at explicit 1/3 impulse power. The idea that the DDM would drag its victims inside its own warp field is silly and unnecessary, when other events in the movie absolutely require us to accept that the DDM really is slower than 1/3 impulse. The only point to be debated there is whether the DDM, too, was limiting itself by choice, like the heroes, or was limited by its design.)

A short segue back to the thread subject matter:

TOS has one aspect of impulse vs. warp that indeed is different from the rest of Star Trek. No, it's not FTL impulse, which never happens anywhere in Trek, chiefly because everybody involved knew it should not happen and wrote TOS accordingly. It's the idea that warp makes ships more nimble than impulse does.

In "Elaan of Troyius", the inability to "go to warp drive" makes the ship "sluggish" in "maneuvers", "wallowing like a garbage scow" at basically full impulse capability. "Bringing her around" doesn't work because "she won't respond fast enough on impulse".

Now, we could dismiss this as saying that with warp power lost, the impulse engines doing the sublight maneuvering are deprived of oomph. But Scotty explicitly says they have 93% impulse power, making the interpretation unattractive. It's the warp drive, rather than warp power, that makes the ship turn quicker.

This works fine with the model where ships lower their inertial mass with subspace fields, and generate those fields with their regular warp drive. Having warp drive on and set at Warp Factor Zero is the way to go if you want sublight agility.

Alas, it doesn't work all that well with the idea that ships with blue domes use their regular warp engines for the job, and ships without use their special internal coils. After all, there is no blue dome in "Elaan of Troyius". The lack of a dome is fairly unique to TOS (even Picard's ship has those blue squares), and this uniqueness might well tie into why Kirk's TOS ship uniquely becomes sluggish at STL when losing warp. But the exact mechanism isn't as obvious as one would hope.

Timo Saloniemi
 
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That's why I think Impulse engines are closer to "Ion Drives" in technology than a simple Chemical Rocket or even whatever a Fusion Rocket is.
Sadly, all of those have the same problems because they all work on the same basic principle: throw stuff in one direction to push the ship in the opposite direction.
The stuff thrown away is called "reaction mass".
Chemical rockets use a chemical reaction to create the energy and the end product of that reaction as reaction mass.
Fusion rockets use a fusion reaction to create the energy and may use the end products as reaction mass or may transfer energy into something else that is then used as reaction mass.
Both chemical and fusion rockets generally use heat as their means of accelerating the reaction mass.

Ion drives use charged particles as reaction mass and usually accelerate it using electromagnetism. (I think I've seen an ion drive powered by radioactive decay, but it was very small.)

They all suffer from the tyranny of the rocket equation. Which in a nutshell says that going fast requires using most of your mass as reaction mass.
IIRC, to accelerate a ship to the speed if the reaction mass (but in the opposite direction) would require using reaction mass nineteen times as massive as the ship.


An odd problem we encounter as we try to deduce what the Impulse Engines are is that they are almost certainly mis-named. While some usages in the show are ambiguous, other uses agree with the Technical Manual that "one-quarter impulse" is a speed, not an acceleration. As mentioned above, "impulse" means force for time, which produces acceleration.

I think we may have to admit that matching what is seen on screen requires some amount of magic and we simply need to decide which kind: lowering the mass of the ship so you get more acceleration from less reaction mass, some doodad that turns energy directly into thrust without reaction mass, or some kind of doodad to turn energy into velocity without thrust or acceleration at all.
 
...Thus giving us maximum flexibility when interpreting the wildly different apparent speeds of different spacecraft that all have been commanded to move at 1/4 impulse.

1) Different ships will have different engines, different power-to-weight ratios and so forth: different accelerations will result.
2) Speed depends on how long one spends accelerating at said setting, and we usually have plenty of room for interpretation there.
3) The command to do 1/4 impulse may result in a failure to perform even if the ship does get moving; a damaged engine is a typical Trek occurrence.

Only one of the above, #3, would hold true were "1/4 impulse" a measure of speed... All the evidence would definitely not fit in such a rigid scenario.

And never mind that "speed" is fairly irrelevant in space, at least when one speaks about "impulse speeds" - those are too fast to matter when docking or maneuvering around a space installation, but OTOH too slow to be useful for travel time estimates on interstellar or even interplanetary journeys. Acceleration is what counts.

(Warp in turn can be assumed to involve virtually no acceleration, except perhaps for massive civilian freighters or other such plot points. You just set a speed and immediately achieve it, and it is universally measured: if you do warp nine and the opponent does warp seven, your speed difference is exactly two warp factors, whatever that means, regardless of the exact specs of the two ships involved. And with warp, dealing with simplistic from-fictional-A-to-fictional-B-in-a-few-hours travel scenarios, we welcome such rigid simplicity. With impulse, we want flexibility for dealing with more down-to-Earth distances and travel times the audience can grasp but the writers can't be bothered to calculate.)

Timo Saloniemi
 
I'm definitely in the "impulse % is a power setting" camp, but that does suggest that a ship could be at "Full Impulse", but also still be stationary. So the driver coils are at 100% power and the ship's mass is reduced as much as it can be, but no actual momentum is being applied. That actually makes me feel better about Kirk always leaving spacedock at 1/4 impulse, while visually still not moving very fast. If 1/4 impulse was an actual speed, they'd be burning out of spacedock at 1000's m/s.

TSFS
KIRK: Clear all moorings.
SULU: Cleared, sir.
KIRK: One-quarter impulse power.
SULU: One-quarter impulse.


TUC
SPACEDOCK VOICE: All lines cleared.
VALERIS: Aft thrusters.
KIRK: Thank you. Lieutenant, one-quarter impulse power.
VALERIS: Captain, may I remind you that regulations specify thrusters only while in Spacedock?


The regulation referred to by Valeris is likely more to do with generating a giant ship-sized subspace field inside spacedock than the actual speeding itself :P
 
Right, this is the best fit description based on what we've seen in TOS and the movies.

I'm definitely in the "impulse % is a power setting" camp, but that does suggest that a ship could be at "Full Impulse", but also still be stationary. So the driver coils are at 100% power and the ship's mass is reduced as much as it can be, but no actual momentum is being applied. That actually makes me feel better about Kirk always leaving spacedock at 1/4 impulse, while visually still not moving very fast. If 1/4 impulse was an actual speed, they'd be burning out of spacedock at 1000's m/s.
 
The Valiant explicitly achieved the impossible. That is, she did not have the means to achieve what she did. Something else thus provided those means. It is fruitless to involve the propulsion system(s) of the Valiant in this issue, as they by definition are not pertinent.

At no point does the "impossible" include "how in the galaxy did the Valiant get out this far." Kirk's log attributes the "impossible" to a ship that had been missing for over two centuries but he doesn't say it was impossible for the Valiant to probe out of the galaxy like the Enterprise intended to do. It's pretty obvious that the Valiant had the means to be out this far and potentially have gone out the galaxy on her own all without warp drive since they only bring up the "old impulse engines" as their means of propulsion.

Captain's log, Star date 1312.4. The impossible has happened. From directly ahead, we're picking up a recorded distress signal, the call letters of a vessel which has been missing for over two centuries. Did another Earth ship once probe out of the galaxy as we intend to do? What happened to it out there? Is this some warning they've left behind?​

...What are you trying to say here anyway? That "old impulse" is orders of magnitude better than "new warp"? Just drop it.

That's the problem of your argument if you try to jam TOS into TNG-continuity. I'm just pointing it out. And not only "old impulse" but "old warp" if we pretend that your assertion that the Valiant had Warp drive was right. The Valiant would have had some form of propulsion that could get her all the way out to the edge of the galaxy and regardless of which one it was still faster than than the NX-01's Warp Drive.

Look, Timo, I've pretty much been discussing this as strictly TOS-continuity and TOS movie-continuity because they are fairly consistent with each other and relavant to DanGovier's question and I point out that TNG-continuity does things differently. Trying to insist that the rules of TNG apply to TOS just doesn't work.

No, it's true. That is, we are told that Romulans have warp in the 2150s. We are never told that they would not have it in the 2260s.

Is this the same TNG continuity from Enterprise that also tells us that Starfleet in 2151 was already aware of cloaking devices in general and that the Romulans have them ("Minefield") but in 2265 it was all hypothetical and Spock was unaware of it's existence? For "Balance of Terror" to be true, the ENT-Romulan's cloaking device and all other cloaks would have to be still "hypothetical" in TOS which would invalidate many episodes of Enterprise which would also invalidate warp-driven Romulans. Strictly TOS, the Romulans at the time of "Balance of Terror" only had impulse and still had it in "The Deadly Years", IMHO. That keeps things simple.

FTL travel (barring "shortcut drives") in Trek is called warp. Sometimes it involves exotic engine types, but none of these is called "impulse", either in TOS or in any other show.

TOS has never said "impulse engine" is specifically a STL-only drive. Not only that, TOS had very un-exotic engines operate at FTL such as their own "ion engine" shuttlecraft from "The Menagerie" and ships with "ion propulsion".

Only in TNG-continuity was everything called "warp" this and "warp" that.

So you are saying the categorical ability to outrun the enemy is insignificant? Whatever. The heroes see significance. They may be wrong, although in the episode they aren't proven wrong on that point. There is no scene where the Romulans would be about to outrun our heroes or otherwise come close to matching the hero speed.

Was the Enterprise able to outrun the Romulan? Yes, but was it significant as in a large measurable amount? No, not really.

This would involve going to maximum warp at some earlier timepoint, in order to achieve the backtracking. From the dialogue, it's clear the hero ship is not at maximum warp to begin with; also, it is at a great distance, too great to ensure hits, which was not the case during earlier shadowing scenes. So the pacing happens before the backtracking, and the backtracking happens as we observe it happening, that is, during the scenes you quote.

Annnddd... that's not how it happens in the episode. Enterprise returns to where it was originally as the reflection that moves as the Romulan moves. They have already backtracked and are now pacing. When Maximum Warp is called the time to the Zone hasn't significantly decreased. Therefore the pacing speed wasn't that much slower than Maximum Warp.

ROMULAN: Commander, the reflection returns.
COMMANDER: Activate our cloak.
ROMULAN: Commander, our fuel runs low.
COMMANDER: Quickly!
DECIUS: The Earth vessel? Impossible.
ROMULAN: It moves as we move.
COMMANDER: Its commander is not one to repeat a mistake.
...
STILES: We'll enter the Neutral Zone in one minute, Captain.
...
SPOCK: We're still on our side, Captain.
KIRK: Let's get them while we are. Before we enter the Neutral Zone. Full ahead, Mister Sulu. Maximum warp.
SULU: Ahead, sir. Maximum.
...
COMMANDER: Evasive action. The Earth ship again.
...
[About 40 seconds after Maximum Warp is called.]
STILES: Twenty seconds to Neutral Zone, sir.
KIRK: Lieutenant Uhura, inform Command base, In my opinion, no option. On my responsibility, we are proceeding into the Neutral Zone. Steady as we go, Mister Sulu. Continue firing.​


When ships in TOS (or in Star Trek, which is not split into utterly dissimilar parts the way you think it is) appear in the same frame, they are at impulse. Except when
1) there is a warp chase going on, with the telltale feature of both ships having their noses pointed the same way, which is not the case in TWoK, or
2) the warp fields (or indeed the vessels themselves) are nested, which only ever happens with vast superenemies like V'Ger or the Borg, and never in TOS.

Except in "The Doomsday Machine". On Decker's attack run the Enterprise still has warp drive. As the Enterprise is closing, FX shots show the Doomsday Machine flying backwards relative to the Enterprise when they are in the same frame. Only when the Enterprise's warp is out and they are caught in the tractor beam is when the movement is forward relative to the DDM. And in DDM, when the Enterprise breaks off it is at impulse power. This is not any different from the Reliant closing in reverse relative to the Enterprise at warp in their initial encounter or Enterprise flying over and around V'ger at warp (Enterprise doesn't disengage her engines until she's *tractored* later.)

And even in TNG-continuity, how is that different from when Voyager is attacked at warp (in the same frame) by a Kazon raider in "Basics" and you can clearly see the Kazon isn't pointing the same direction as Voyager? Or when Suliban ships circled (as in not pointing the same direction) around NX-01 Enterprse at warp in the same frame in "Shockwave"?

Back to DDM...
It's clear from the dialogue that the DDM in a straight-line race can catch a warp-driven Enterprise but the Enterprise can out-maneuver it to gain distance. The Constellation was only saved because the Enterprise fired at the DDM, not that it had a chance to get away at 1/3 Impulse power. The Enterprise, OTOH, still had full impulse power.

[With a working warp drive]
SPOCK: We are more maneuverable, but it is gaining on us. Sensors indicate some kind of total conversion drive.
...
[Down to impulse drive]
SULU: It's closing with us again, sir.
DECKER: Maintain speed and distance.
SULU: It's sucking in space rubble from those destroyed planets. Refueling itself.
SPOCK: We can maintain this speed for only seven hours before we exhaust our fuel, but it can refuel itself indefinitely
...
SPOCK: Captain, we are taking an evasive course back to you. We will try to stay ahead of the object until we can transport you aboard.​

A short segue back to the thread subject matter:
After all, there is no blue dome in "Elaan of Troyius". The lack of a dome is fairly unique to TOS (even Picard's ship has those blue squares), and this uniqueness might well tie into why Kirk's TOS ship uniquely becomes sluggish at STL when losing warp.

The Reliant's blue dome is blown up in TWOK yet their impulse drive is fine while the warp drive and photon controls are knocked out. So the presence or lack of presence of the blue dome has no bearing on impulse capability. TOS followed a simple formula, impulse drive is slower and less nimble as warp drive, especially in combat. No where is it said in TOS that Impulse is exclusively STL.
 
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At no point does the "impossible" include "how in the galaxy did the Valiant get out this far."

This is the only thing it includes.

If it were theoretically possible for older ships to travel the distance in the time allotted, nothing here would be impossible in the slightest. Recorder markers are clearly supposed to be found centuries after their deployment, in the depths of space, considering Kirk did find this one. But if going to the edge were possible, somebody would no doubt have done it, or attempted it and failed, and Kirk would find nothing remarkable there.

It's not Peary going "I found this scroll from this Jones guy here a mile from the pole, did somebody reach it twelve years ago?". It is Armstrong going "I found this scroll from this Aruhayadha guy here twenty feet from the LM, did somebody reach the Moon 2,000 years ago?".

That's the problem of your argument if you try to jam TOS into TNG-continuity. I'm just pointing it out.

I'm just making the true statement that TOS writers already were told to treat impulse as STL. You are trying to pretend they were not.

If they fucked this up once or twice, it's not your business to pretend they meant it to be. Nor to use ambiguous cases as evidence one way or another, considering it is all just part of the "were told to write X, did not always succeed" phenomenon.

Now, if there were an actual pressing reason to say that the Trek universe is different from intent, saying this out loud would be fine and well, especially if this did not require contradiction of what was actually shown. Many a writer has decided that earlier intent was wrong and e.g. Spock's human "ancestor" was in fact his mother, or the Klingon Empire has no emperor. Few have needed to contradict anything but our expectations in doing so.

But our only real case of interstellar impulse is the scenario where "Balance of Terror" was interstellar. And that episode is fucked up anyway and won't get any better by assuming FTL impulse.

For "Balance of Terror" to be true

... Everything else would have to be false, including all the other Romulan episodes of TOS. So ignoring the episode is no great crime, and if anything, our efforts should be aimed at negating the episode with minimal contradiction.

Say, Romulans who can be outrun by the hero ship so categorically cannot have fought the established past war or be a threat in the upcoming one, regardless of the other specs or designations of their inferior drive. The discussion about Romulan propulsive prowess cannot apply to the Romulan species, and must only apply to this Romulan vessel. Which is what explicitly happens - the heroes study the evidence at hand, without preconceptions.

TOS has never said "impulse engine" is specifically a STL-only drive.

Nor has TNG or ENT. But in all cases, the writers were told this is the case, and they wrote it so, without a need to insert explicit dialogue to the effect.

If "BoT" stands out there, we just step on it and grind. The other TOS episodes do not stand out, and are at very best ambiguous, just like most TNG or ENT stuff.

Not only that, TOS had very un-exotic engines operate at FTL such as their own "ion engine" shuttlecraft from "The Menagerie" and ships with "ion propulsion".

No. The latter engine was explicitly exotic. And the former never existed - the actual term is ion engine power, which is not a real-world thing at all. Drawing connections to a late 20th century technology of a similar name is like saying that warp must refer to the way the Wright brothers controlled their aircraft.

Was the Enterprise able to outrun the Romulan? Yes, but was it significant as in a large measurable amount? No, not really.

Yes, yes really. How can we tell? Because the heroes never failed in it. Flying rings around the enemy was a feature till the very last.

Do I want this to be watertight evidence? Of course not - I want Romulans to be able to match the hero ship in speed, just as they do in all the later episodes. But I have nothing riding on the speed gap in the first episode. If the Romulans moved slowly, it may be due to them only having impulse, or them having warp as well but not being able to use it in this sub-underwater scenario. Neither take forces me to believe in FTL impulse.

Annnddd... that's not how it happens in the episode. Enterprise returns to where it was originally as the reflection that moves as the Romulan moves.

No, it does not. In the earlier shadowing, there was no issue of extreme weapons range. In this shadowing, there is. The distances are different, and obviously this is because maximum warp cancels out emergency warp when and only when we see those orders issued. Adding a third, off-camera action through pure speculation would contradict the events.

Heck, had Kirk hit maximum warp before he was shown doing it, what Romulan would consider him a sensor echo? Stealth is important in the episode, and difficult to achieve. Mad dashes don't work there.

As for "DDM", the movements of the crippled Constellation across the battlefield are the decisive ones, and establish the extreme tardiness of the DDM. None of the close action would take place if the DDM could outpace 1/3 impulse.

And even in TNG-continuity, how is that different from when Voyager is attacked at warp (in the same frame) by a Kazon raider in "Basics" and you can clearly see the Kazon isn't pointing the same direction as Voyager?

You have it backwards here. Two players who have warp drives running can fly rings around each other. This does not apply to the scenario at hand where you claim the same is true even when one party is at impulse.

Many shows emphasize the risks of merging or penetrating warp fields. Combat should not feature such delicate cooperation. And why would Kirk wish to rendezvous Khan at warp in this delicate fashion when Khan is said to be slowing and OTOH is moving in the opposite direction and thus clearly has no wish to travel to Regula with Kirk?

When two ships meet, there is no good reason to assume dissimilar drive modes unless somebody says so. Heck, nobody says so even in TMP! We just assume Kirk isn't warping like mad all the time. Which is a good assumption, one that the VFX choices sometimes manage to support and not without intent. But a pretty exceptional event, and certainly not related to TOS in any way (the whole point back then being to make people forget TOS ever happened the way it did).

The Reliant's blue dome is blown up in TWOK yet their impulse drive is fine while the warp drive and photon controls are knocked out.

Which is why I previously reminded folks that Khan had two, negating the value of this evidence.

No where is it said in TOS that Impulse is exclusively STL.

Except in the written instructions for the TOS writers.

So any attempt to see FTL impulse in TOS must be aimed at contradicting writer intent for greater good. And any attempt to pretend that such an attempt describes TOS is futile.

Beyond that, FTL impulse is a question of consistency within the boundless fictional context. Is Spock's human ancestor his mother or his great-great-grandfather? Now we know. Does Spock have a sister? We still don't know. Is impulse FTL? We now know it is not.

Timo Saĺoniemi
 
This is the only thing it includes.

Where does the "impossible" include "how in the galaxy did the Valiant get out this far?" His "impossible" is directly related to finding a ship missing for over 200 years. Not only that, he's wondering what it was doing out there not how it got there.

Captain's log, Star date 1312.4. The impossible has happened. From directly ahead, we're picking up a recorded distress signal, the call letters of a vessel which has been missing for over two centuries. Did another Earth ship once probe out of the galaxy as we intend to do? What happened to it out there? Is this some warning they've left behind?​

It's not Peary going "I found this scroll from this Jones guy here a mile from the pole, did somebody reach it twelve years ago?".

Bingo! That's exactly what its like :)

I'm just making the true statement that TOS writers already were told to treat impulse as STL. You are trying to pretend they were not.

If they fucked this up once or twice
, it's not your business to pretend they meant it to be.

That's fascinating. So you're upset that I'm accurately pointing out what is shown in TOS doesn't adhere to what you think it should be? Hmmm.

Well, look Timo, I'm going to agree to disagree with you then. I still respect your opinion so I'll stop us here as we're both not covering new ground since you've got your own reasons to hold tightly onto STL Impulse as an absolute in all of Star Trek. :beer:
 
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