how did the energy inside the shield when the stargate exploded couse the emitters to fry. when massive bombardment from multiple wraith hive and crusers not do it.

I assume it's because the gate blowing up was the equivalent to a dozen nuclear bombs and it was very intense and concentrated. Although it really doesn't make much sense.—Anubis 10545 00:49, 30 September 2008 (UTC)
I think it was because the shield was shrunken to such a small size that the emitters couldn't sustain the size of the shield and overloaded, kinda like when you make a tight fist and hold it for so long that your muscles become strained. It was also stated that if the shield was expanded too much it would become "dangerously thin" even with 3 ZPMs, so I assume that the size of the shield is directly correlated to its effectiveness somehow. It could also be that the explosion, which would have been amplified immensely when it was contained like that, drained so much power from the ZPM that the shield could no longer sustain itself. AscendedAlteran 15:41, 30 September 2008 (UTC)

I agree. but even with a dozen(12)is not that much energy comparied to a ZPM. 12 of the most powerfull nuclear weapons (twelve of the Tsar bomb)is not only a little bit more than 1 octillion watts. I know the ZPM has more power than that. Any thoughts on what i said. Does it sound correct or completly wrong.

Correct, but you're forgetting that the ZPM they have is used to continuously dial Earth, was used to get Atlantis to its current location, and we have no idea how much energy had been used up before it was even stolen. We also know that when available energy becomes scarce the shield emitters begin to fail one-by-one, as seen in "Rising". AscendedAlteran 21:44, 30 September 2008 (UTC)
The emitters were "Fried". In Rising, they didn't have enough power. The ZPM still (probably) has power in it. And in Lifeline after Atlantis landed on M35-117, Mckay said the ZPM still had plenty of power.—Anubis 10545 22:44, 30 September 2008 (UTC)

I guess it was just the shield was not designed to colapse or be aranged around that small of an object. I don't think that the ZPM didn't have enough power (when the trust infultrated atlantis in Critical mass McKay said the ZPM when it overloaded it would destroy the planet which is equivelent to around at least 10 to the 32 power or a maximum of 10 to the 38 power. so the ZPM has plenty of power most likley around 10 to the 40th when fully charged) it's that the emmiters where not designed to emit the shield to that small of a radius. What do you think.

I agree, the shield wasn't really meant to do this, and there is still plenty of power left in the ZPM since they landed on M35-117. They didn't do anything drastic or major to it ever since (unless there was another McKay double to send back, which I don't recall) -- Matthew R Dunn 23:32, 30 September 2008 (UTC)

So problem solved then. The emiters were not designed to cover that small of a radios. It was designed to cover great distences and the ZPM had nothing to do with the shield dropping.

Or perhaps it's for the same reason as the stardrive not working with just 1 ZPM. Even though the ZPM has more than enough power in it to make many trips, it cant extract it that quickly so if you need a lot of power all at once then you need more than 1 power source. When the shield had to resist the 12 nukes, it was having to do it all at once, with the entire force of them impacting the shield (if they had impacted the outside then over 3/4 of it would have gone off in a different direction to the shield) so it was like having to resist over 48 nukes when at full size. One ZPM cant exert enough power at one time to counter that and so the shield failed because it wasnt getting enough energy so it just got overpowered. Sman789 18:27, 14 January 2009 (UTC)

Unfortunately, this is a bit of a confused issue. On the one hand, there is evidence that ZPMs do have a finite peak power output, otherwise it would be emminently possible to fly the city with only one unit - it would simply have only a third the endurance. However, in McKay and Mrs Miller, we saw the ZPM be depleted from well over 50% to 0% in a matter of seconds, which implies a nearly infinite peak power output. Personally I regard that as something of a mistake in continuity.

Another point that needs raising - is the shield really impenatrable, or is it just that it has never been under sufficient stress to fail before? Logically, if ZPMs have a finite peak power, then so should the shield. -- 17:55, 20 January 2009 (UTC)

On the first point, we could asume that seeing as a ZPM is a matter bridge in itself then it could just be redirected or something to make it faster. Seeing as lots of evidence points to it having a limit and only that as evidence pointing against it we kinda have to go with the most supported theory.

As for the second one, on this wiki we generally count each technology as individual, so the ZPM is not part of the shield just as the Asgard generators are not part of their hyperdrives. Therefore limits of power are not treated as limits of the technology itself (unless the technology in question is a power source,) allthough it is mentioned that the shield will drop when power runs out on the article. Sman789 18:26, 20 January 2009 (UTC)

It's more a matter of logical deduction. If the output of the shield was not subject to an inherent limit regardless of the available power, then the Ancients could have powered a shield that would hold against the entire Wraith fleet, and flown the city into hyperspace at the same time, by the simple expedient of plugging in more ZPMs. We know from "Before I Sleep" that there were at least five extra ZPMs available to the Ancients.

The shield was able to hold back the entire Wraith fleet, its just that it was draining power so rapidly that it was easier to submerge the city. As for flying the city away: it takes so much power to even lift the city off the ground that, when also given the task of repelling an entire fleet of ships, the ZPMs would have probably been drained before the city even attained escape velocity, let alone open a hyperspace window and keep it open long enough to travel to a planet where the Wraith couldn't find them. I think its more likely that the shield draws as much power as needed to resist the amount of force being applied, hence it takes more power to hold back more force. Its also possible that the shield replenishes itself so rapidly that it only seems to be impenetrable, but the more damage the shield takes the more power is needed to regenerate the shield. The latter seems more likely, as there have been several mentions of how much strain the shield is under; and in "Enemy at the Gate" the shield was referred to in percentages. —AscendedAlteran 03:22, 21 January 2009 (UTC)

Power save mode Edit

The shield appears to have a power save function, used to hold back the water whilst Atlantis spent 10,000 years under Lantea's ocean. It allows the shield to function more like the shields of Aurora-class battleships in that it contours perfectly around the City-ship's hull and is invisible apart from when it deactivates or fails. When attacted by enemy fire on the surface of the ocean it is neccessary for the shield to cover a small portion of sea to prevent turbulance from weapons fire hitting the water that may damage the city if it grows intense, in a similar maner to damage suffered from space combat. This mode of the shield likely uses less power due to reduced size and so for reletivly simple tasks such as withstanding ocean pressure for long periods of time with a limited power source it is very efficiant.

Does this seem ok to you, it refers to Rising part one where Atlantis's shield was clearly not a bubble? Sman789 21:41, 24 January 2009 (UTC)

It sounds too speculative. What do you mean not a bubble?—Anubis 10545 22:36, 24 January 2009 (UTC)

Compare (Rising) with (First Strike) please. Also it's not a bubble at all on rising not even here and also when it "pops" it is not the same as the shield shrinking on Adrift. Sman789 23:05, 24 January 2009 (UTC)

While I could only access the first image (where Atlantis was coming out of the water), it's shield was down. There was no shield and that's why the failsafe activated, rising the city to the surface. When the air bubbles were rising from the city when it was under water, we have no way of knowing exactly how the city was breached. However, as the outer piers were flooding before any other part, one could assume the that means the shield was falling back towards the control tower like in Adrift. So, saying that the shield was not a bubble in rising is just speculation.—Anubis 10545 00:44, 25 January 2009 (UTC)

In rising rodney states that the shield is now a thin outer shell so i think that agrees with Sman also the shield was active when the city was rising as it was shown in before i sleep that the city is not water tight so if it was not the whole city would have flooded instead of the outer sections BlueSquadron (talk) (Contribs) 20:32, April 14, 2010 (UTC)

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