Interdiction fields

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Post by Kazuaki Shimazaki »

vakundok wrote:What I referred was not a conversation.

Dircetly after the spy reported, the novelization described dock 94 from Luke's point of view and also described the basics of space travel.
Please check it, because I have only the hungarian translation, so I canot quote it.
Oh, you mean
ANH on P.110 wrote:The mathematics of spacedrive were simple enough even to Luke. Antigrav could operate only when there was a sufficient gravity well to push against - like that of a planet - wheras supralight travel could only take place when a ship was clear of that same gravity. Hence the necessity for the dual drive system on any extrasystem craft.
Problems:
1) You are never really free of a planet's gravity well. Its influence on you just get less and less. So one can easily interpret it to the absurdity that you can never really do supralight travel, which is obviously not true.

2) Luke only knows the very basics of starships. For all we know from ANH, he may never have been really on a spaceship before. It is likely he doesn't know all the tricks within, just a blanket generalization from one of those basic level textbooks that gloss over the details of the event.

3) To be fair, it is not certain that many civilian pilots would know about it, considering the stated risk of the maneuver - a pure civvie pilot might never even have to consider doing one in his life. Smugglers and military pilots might know about this.
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Post by Soulman »

Master of Ossus wrote:Actually, it's kind of interesting. The Interdictors appear to be able to direct their gravity in a given angle, or set of angles (ref. HttE, DFR), but they also appear to actually generate mass. I'm not sure how this works, other than it works very well.

Hyperdrives can suffer serious damage if they jump too close to a large mass, so most hyperdrives have safeties installed to prevent such problems. I assume that the mass shuts off the hyperdrive, so as to prevent the ship from seriously damaging or even destroying itself. You can call that a "trick," if you want, but since there's a real threat of damage here I don't think that qualifies.
If jumping near large masses just damages the hyperdrive couldn't you use the backup (I'm sure that I've heard that a lot of ship have backup hyperdrives) to jump away from an Interdictor (trashing the backup in the process) then use the primary drive until you can get repairs done?
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Post by Kazuaki Shimazaki »

Maybe the backup only got barely what it takes to get the ship into hyperspace, and only on a good day, so if an Interdictor's in the way, all you'd do is get it blown up and still not make hyperspace?
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backup speed

Post by omegaLancer »

Problem on using a backup , is that they most likely design to get you to the nearest inhabited system and at low speed. Cost would be the factor, keep it cheap.

At that case even if you made it into hyperspace , you would be easily track and chase down by the imperial blockage forces..

The backup most also be design to only come on line after a long manual routine to insure that it doesnot come on doing the operation of the normal hyperdrive unit.
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Post by PainRack »

Soulman wrote:
If jumping near large masses just damages the hyperdrive couldn't you use the backup (I'm sure that I've heard that a lot of ship have backup hyperdrives) to jump away from an Interdictor (trashing the backup in the process) then use the primary drive until you can get repairs done?
"a hold full of scrap metal" will suggest otherwise.
vakundok wrote:What I referred was not a conversation.

Dircetly after the spy reported, the novelization described dock 94 from Luke's point of view and also described the basics of space travel.
Please check it, because I have only the hungarian translation, so I canot quote it.
I see,a different quote.

In that case,I will refer you to the words "sufficient gravity well".Remember,I specifically stated that a hyperdrive can't be engaged in all situations in a gravity well.There has to be a level of interference strong enough that no matter how strong the protection afforded by the hyperdrive systems,castrophic damage can still occur(pls read my mechanism again).
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Post by vakundok »

Kazuaki Shimazaki: Thanks for the quote! Do not forget that the space was his dream. And it did not describe what Luke knew (thought) about hyperspace, but the "mathematics of spacedrives".


So, supralight travel can only take place if the ship is clear of that "sufficient" gravity well (like the gravity well of a planet).

There are several questions:
1: From what distance a gravity well (of a normal planet) is sufficient?

When the DS arrived to Alderaan the approximately six planetary diameter was stated as antigravitic distance, however the MF arrived to one planetary diameter from "Alderaan".

2: What does it mean "canot take place"?

-The ship does not enter hyperspace at all only the hyperdrive damages.
-An uncontorrlable misjump happens.
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Post by Kazuaki Shimazaki »

I think taken in context of the entire SW universe (Han's statements, emergency jumps in gravity wells in official) that it merely means you RISK an uncontrollable jump and damage to your equipment. Sure, at some gravity level, you probably can't jump at all, but it would seem the window is not sealed at a normal planetary level.

Luke dreams of being a spacer. So do many kids. How many kids can work out the trajectory to the Moon, however, or any of the intricate aspects of even current spaceflight. He probably knows some of the mathematics, even the theory, but he doesn't know the limits or what happens in practice.

IIRC, some official suggest that very few people fully understand hyperspace. Could someone provide that quote?
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Post by vakundok »

Kazuaki Shimazaki wrote:Luke dreams of being a spacer. So do many kids. How many kids can work out the trajectory to the Moon, however, or any of the intricate aspects of even current spaceflight. He probably knows some of the mathematics, even the theory, but he doesn't know the limits or what happens in practice.
I think any "kid" who is trying to go to an astroanutic academy for years could work out that. However the quote was still the "mathematics of spacedrives" not what Luke dreamt about it. (Side note: Besides Luke thrusted himself being able to pilot a ship to Alderaan when Solo said the price of the trip. So, that kid could possibly pilot a rocket to the Moon.)
Kazuaki Shimazaki wrote:IIRC, some official suggest that very few people fully understand hyperspace. Could someone provide that quote?
So, officially while there are engineers who design hyperdrives (even new kind of hyperdrives (mini hyperdrive in Tie fighter game)), the possibility of jumping from a gravity well is not taught (or even unknown) on the Academy or it has remained hidden knowledge to the rest after 1000 generations of space travelling.
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Post by Spanky The Dolphin »

Nitpick: I thought Luke wanted to go to the Imperial military academy...

PS: Anyone ever tell you that you're kind of loopy? :?
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Post by vakundok »

Spanky The Dolphin wrote:Nitpick: I thought Luke wanted to go to the Imperial military academy...

PS: Anyone ever tell you that you're kind of loopy? :?
So, I am loopy. It does not mean that I canot have a point, does it? 8)

If I remember well, the exact name of the Academy was not mentioned. However, Biggs Darklighter was qualified to become the first officer of a freighter. Most likely a civilian one, because he was still affraid of that the Empire would call him up for military service.
In my opinion becoming officer of a (civilian) starship requires knowledge about the space not about military.
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Post by Kazuaki Shimazaki »

vakundok wrote:I think any "kid" who is trying to go to an astroanutic academy for years could work out that. However the quote was still the "mathematics of spacedrives" not what Luke dreamt about it. (Side note: Besides Luke thrusted himself being able to pilot a ship to Alderaan when Solo said the price of the trip. So, that kid could possibly pilot a rocket to the Moon.)
He's trying to get to the Imperial Academy. Since the quote was based on Luke's perspective, it implies that it is what he knows, not necessarily the whole truth. It is also a necessary rationalization considering Han apparently thinks it is possible, just very dangerous, and has even played the card himself sometimes.

Luke seems to have zero to very little real spacetime. He might be able to do a "by-the-book" flight to Alderaan (no risky moves, just fly out straight, point at Alderaan, use automatic hyperspace computation, set, jump ... all by the book,) but he probably have the experience yet to evade Imp patrols and all...
So, officially while there are engineers who design hyperdrives (even new kind of hyperdrives (mini hyperdrive in Tie fighter game)), the possibility of jumping from a gravity well is not taught (or even unknown) on the Academy or it has remained hidden knowledge to the rest after 1000 generations of space travelling.
How is it unknown? I'd think most of the experienced smugglers who had to use these last-ditch tricks to evade some Imp ship knows it. Just that they won't put it in the basic level textbook that Luke probably read.

I would think that they are saying most of those people are Engineers. There are very few scientists who understand the whole picture.
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Post by vakundok »

ANH novelization wrote:The mathematics of spacedrive were simple enough even to Luke.
To me, it means that the mathematics of spacedrive were simple.

To you, it means that the mathematics of the spacedrive were hard to understand and Luke had got only the very basics of it.

Sorry, but your interpretation sounds to me that you override canon in favor of the official resources.
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Post by vakundok »

Kazuaki Shimazaki wrote:He's trying to get to the Imperial Academy.
You have my opinion. In your opinion what qualification (knowledge) the Imperial Academy gave?
Since the quote was based on Luke's perspective, it implies that it is what he knows, not necessarily the whole truth.
While my english is still terrible, that sentence had to be based on higher level, since Luke was mentioned in it with the "even to".
vakundok wrote:So, officially while there are engineers who design hyperdrives (even new kind of hyperdrives (mini hyperdrive in Tie fighter game)), the possibility of jumping from a gravity well is not taught (or even unknown) on the Academy or it has remained hidden knowledge to the rest after 1000 generations of space travelling.
How is it unknown? I'd think most of the experienced smugglers who had to use these last-ditch tricks to evade some Imp ship knows it.
So, police forces faced with this several times and it is still not well known?
We do not know what level of knowledge Luke had access to, we know only that he had not PRACTICAL experience with hyperspace.
I would think that they are saying most of those people are Engineers. There are very few scientists who understand the whole picture.
What engineers know is taught to the next generation of engineers and soon (within a few centuries :D ) becomes basic knowledge.
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Post by vakundok »

My oppinion:
ANH on P.110 wrote:The mathematics of spacedrive were simple enough even to Luke. Antigrav could operate only when there was a sufficient gravity well to push against - like that of a planet - wheras supralight travel could only take place when a ship was clear of that same gravity. Hence the necessity for the dual drive system on any extrasystem craft.
Hyperspace travel (jump) canot happen at all within a sufficient gravity well.
We're still within the gravitational influence of Tatooine," came the cool response. "It will be a few minutes yet before the navigation computer can compensate and effect an accurate jump. I could override its decision, but the hyperdrive would likely shred itself. That would give me a nice hold full of scrap metal in addition to you four."

Accurate jump canot happen within gravitational influence. Trying this would most likely damage the hyperdrive. It does not necesserely mean that "inaccurate jump" can happen within a gravity well.

My opinion is that hyperspace jumps are not possible within a gravity well at all and trying would result only a damaged hyperdrive without any jump happening. It seems to fit without any reinterpretation of the canon evidence.
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Post by Kazuaki Shimazaki »

vakundok wrote:My oppinion:
ANH on P.110 wrote:The mathematics of spacedrive were simple enough even to Luke. Antigrav could operate only when there was a sufficient gravity well to push against - like that of a planet - wheras supralight travel could only take place when a ship was clear of that same gravity. Hence the necessity for the dual drive system on any extrasystem craft.
Hyperspace travel (jump) canot happen at all within a sufficient gravity well.
We're still within the gravitational influence of Tatooine," came the cool response. "It will be a few minutes yet before the navigation computer can compensate and effect an accurate jump. I could override its decision, but the hyperdrive would likely shred itself. That would give me a nice hold full of scrap metal in addition to you four."

Accurate jump canot happen within gravitational influence. Trying this would most likely damage the hyperdrive. It does not necesserely mean that "inaccurate jump" can happen within a gravity well.

My opinion is that hyperspace jumps are not possible within a gravity well at all and trying would result only a damaged hyperdrive without any jump happening. It seems to fit without any reinterpretation of the canon evidence.
I'd say that Han implies some kind of jump is possible, or else he'd never even consider it. Instead, he'd say "We are still in the gravitational influence of Tatooine. We have no chance before the nav computer compensates."

IMO, especially when taking into account official evidence as well, it is not a hard line in the dirt. There is no doubt a gravity value where it is perfectly safe to enter hyperspace, another higher value where there is no discussion. But it would seem there is a buffer zone where you can do it, but it is not safe. You may blow your hyperdrive or be taken to God knows where.

What one calls "overriding," the other calls "rationalization." If you REALLY read that P.110 statement ultra literally and by itself, you would *never* be able to reach hyperspace because you are *never* truly free of a planet's gravity, but you will leave the area of "sufficient" gravity for the antigrav. Since this is most blatantly false, there is obviously a limit to the literal accuracy of this statement.

If we assume the "same gravity" means the same "sufficient" gravity well rather than just the presence of gravity itself, it still leaves tons of questions. Such as - how hard is the barrier? Is there a hard number? Is the hard number a engineering limitation (a good drive can do better) or is it a first principle type of limitation?

It did say "even to," but the entire section in context was Luke centered. The measure is probably known to smugglers, customs (at least those that have seen it or heard rumors of it) and *maybe* even in the more advanced parts of the Academy lecture, but not the basics (yeah, they teach you how to push the limits on Day 1 of your course.) Since we don't know what level of knowledge Luke had access to, let's not assume too much. When I mentioned the engineering part, I'm saying the intricate parts (which no doubt involve mathematics) of hyperspace physics is only understandable to a few physicists, so it is unlikely that Luke *literally* understands the advanced parts of "the mathematics of spacedrive."

Probably if there were no other quotes and no other official data, then your interpretation could work. Otherwise... it is also the choice taken by what seems to be everyone but you. It doesn't make it right, but literature always had a bit of interpretation room.
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Post by vakundok »

Kazuaki Shimazaki wrote:I'd say that Han implies some kind of jump is possible, or else he'd never even consider it. Instead, he'd say "We are still in the gravitational influence of Tatooine. We have no chance before the nav computer compensates."
He thought that Luke was a not-so-smart farmboy. (And Luke acted like that.) When you say to a not-so-smart farmboy that you canot do something, you will also automatically say why you will have no chance to do it. (Yes, he answered that to Kenobi but it was also to that farmboy.) Since it was normal human behaviour, it could or could not be an implication.
Kazuaki Shimazaki wrote:What one calls "overriding," the other calls "rationalization."
I was rude, sorry about it. :(
Kazuaki Shimazaki wrote:If we assume the "same gravity" means the same "sufficient" gravity well rather than just the presence of gravity itself, it still leaves tons of questions. Such as - how hard is the barrier? Is there a hard number? Is the hard number a engineering limitation (a good drive can do better) or is it a first principle type of limitation?
These question are present with the "buffer zone" approach as well.
Kazuaki Shimazaki wrote:It did say "even to," but the entire section in context was Luke centered.
What Luke felt was Luke centered, but the description of the dock? Luke centered?

It seems that this whole question depends on whether the quote from page 110 was Luke's probably limited knowledge about the hyperspace or the description of the hyperspace. Please, provide your interpretation of that quote with as few changes to the original as possible.
Kazuaki Shimazaki wrote:Probably if there were no other quotes and no other official data, then your interpretation could work. Otherwise... it is also the choice taken by what seems to be everyone but you. It doesn't make it right, but literature always had a bit of interpretation room.
Please, also provide those other canon quotes.

Side note: Officially, emergency jumps are possible from the "buffer zone" (or even from an atmosphere?). Don't you think that being followed by 3-5 destroyers and loosing your rear shield would be an emergency? The simple fact that they did not make an emergency jump implies that no emergency jumps are possible.
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Post by Kazuaki Shimazaki »

Yeah, but he would not use "likely," nor propose he could even try to override if he had no chance. He would just explain that if he makes the jump, they'd all die.

The point of analyzing the statement is to see whether it is as hard as it is. I also pointed out (earlier) it could be interpreted to the absurdity that no jump would ever be possible because nobody is ever really free of gravity wells. Which is obviously absurd.

Even the description of the dock is to describe what Luke sees.

Ultimately, all I said was that where you see a yes/no hard line, I see a yes/increasing danger/no way zone. Nowhere in there does it guarantee a hard line, either for the antigrav (or do you think the antigrav works just fine at one distance, and is totally useless the next kilometer out) nor the hyperdrive. Everybody but you seems to see the statement as "soft" rather than "hard."

The decision to do a last-ditch maneuver depends on your assessment of your odds. It is a call, and your call may not be the same as the Captain's in charge. They are losing the deflector shield, but obviously Han's counting on the fact they are soon reaching the point they can do it safely anyway. If your deflector shield is going in 10 seconds, but you are also within ten seconds of being able to make a safe jump, you are probably going to wait that ten extra seconds rather than jump with say a 5% chance of mishap.
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Post by vakundok »

Kazuaki Shimazaki wrote:Yeah, but he would not use "likely," nor propose he could even try to override if he had no chance.
Basicly true and thanks for pointing out that "likely".
Possible explanations without hurting the "no jump" approach:
1. It would be true in the case if the possibility of the emergency jumps (the attempt to jump within (or out of? :? ) the compensation border of the hyperdrive) would have been well tested for all types (and actually for all) hyperdrives, for all possible environments (Do not forget that it was a binary system, so somewhat uncommon, I think.) for all possible distance from that hard line. Testing ALL of these is impossible even if we could consider that that hard line was constant for a planetary object, which we canot. Without full testing everything extreme is only likely.
2. Jumping within the compensation border of the hyperdrive is impossible and will cause more or less damage to the hyperdrive. The level of damage depends on the "uncompensated" gravitational influence. This damage level is hard to pre- determine especially without any calculations.
(Personally I prefer explanation 2)
[EDIT:
An example (to a not-so-smart farmboy from Tatooin):
-I will not run into that massive cement wall because it is impossibble to cross and I will die.
But if you want him to really understand it, you will say:
-I will not run into that massive cement wall. I could do it but likely I would watch my brain flowing out and die.

See? The later does not necesserely mean that it is possible to run through that wall. So, he did not propose, but only mentioned the jumping.]
The point of analyzing the statement is to see whether it is as hard as it is. I also pointed out (earlier) it could be interpreted to the absurdity that no jump would ever be possible because nobody is ever really free of gravity wells. Which is obviously absurd.
Exactly yes. It could be. But why to interpret it in that way if there is an interpretation which is consistent with the other same level quote?
Even the description of the dock is to describe what Luke sees.
And what all others see. Does it mean that it was "all others centered"? Of course not. There was an establishmnet and a personal feeling centered around Luke and a few descriptions. Saying that those two make the whole section (the descriptions) Luke centered, especially since there was the spy who remained undetected by them (not only by Luke) and Luke was mentioned from a "higher level view" ("even to Luke") seems to be a very brave assumption to me.
Ultimately, all I said was that where you see a yes/no hard line, I see a yes/increasing danger/no way zone.
Yes, exactly. I think the difference between our approaches is quite clear for all of us.
Everybody but you seems to see the statement as "soft" rather than "hard."
Yes. However, as you wrote it previously, this does not make it right. My interpretation seems to be closer to the literal statement, and without GL himself it is very hard to determine.
The decision to do a last-ditch maneuver depends on your assessment of your odds. It is a call, and your call may not be the same as the Captain's in charge. They are losing the deflector shield, but obviously Han's counting on the fact they are soon reaching the point they can do it safely anyway. If your deflector shield is going in 10 seconds, but you are also within ten seconds of being able to make a safe jump, you are probably going to wait that ten extra seconds rather than jump with say a 5% chance of mishap.
It is true, again. Except (if I remember well) that in TESB when they got that shield loosing sign, the shield was gone and in ANH (after the shield loosing sign) Han worried about even a close (not direct) hit. Theese suggest that they had no more seconds with shield protection making the situation an emergency requiring an immediate jump.
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Post by Connor MacLeod »

Master of Ossus wrote:Actually, it's kind of interesting. The Interdictors appear to be able to direct their gravity in a given angle, or set of angles (ref. HttE, DFR), but they also appear to actually generate mass. I'm not sure how this works, other than it works very well.
Good point. HttE described Interdictor gravity wells as having inertia, and thus being difficult to angle/manipulate (Luke was able to trick it into moving one way.)

Wouldn't the mass of the Gravity well have to be less than the ship though? Otherwise I imagine the mass itself would move the SHIP, not the other way around.
Hyperdrives can suffer serious damage if they jump too close to a large mass, so most hyperdrives have safeties installed to prevent such problems. I assume that the mass shuts off the hyperdrive, so as to prevent the ship from seriously damaging or even destroying itself. You can call that a "trick," if you want, but since there's a real threat of damage here I don't think that qualifies.
I always figured the damage was from "rough handling" due to rapid transitions in/out of hyperspace - decelerating too fast or too hard might be pushing the systems tolerances and such. I can think of offhand several examples where such occured (The HIMS systems the Bakurans used to penetrate the Corellian Interdiction field, Skywalker reverse-firing his acceleration compensators in HttE - which is something Solo supposedly did in TESB to decelerate behind the Avenger's Bridge Tower.)
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