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siegecrossbow said:

https://imgur.com/VsAtyNp

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Fulcrum007 said:

https://twitter.com/i/web/status/1456516737290039298

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KampfAlwin said:

Yeah but the US AC was doing it in rough sea conditions, the Indian one looks calm.

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Stealthflanker said:

sagging and hogging is normal. At most it's just show she's lightly loaded at front. and one have to know what speed she's cruising as the faster she goes she might approach or maybe exceed her speed-length ratio. At this condition a ship's movement starts to cause squat phenomenon where the stern is lower and the bow actually rise.

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Here's an earlier footage showing the ship's pitch movement in what appears to be a relatively calm sea state. This begs the question, even if the carrier was sailing at top speed, such severe pitching just doesn't seem optimal. After all, she is expected to sail into the wind at top speed during launch operations, and I wonder if this would present a rather dangerous situation.

by78 said:

Here's an earlier footage showing the ship's pitch movement in what appears to be a relatively calm sea state. This begs the question, even if the carrier was sailing at top speed, such severe pitching just doesn't seem optimal. After all, she is expected to sail into the wind at top speed during launch operations, and I wonder if this would present a rather dangerous situation.

https://imgur.com/O4tcTzi

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One believes what he wishes to believe. The ship is not fully loaded btw.

Regardless, that is why sea trials exist, which the ship has gone through consistently. Any such "problem" would have been noticed and informed aptly to the builder. I am sure the people handling such stuff are more qualified than screen-amateuer experts.

by78 said:

Here's an earlier footage showing the ship's pitch movement in what appears to be a relatively calm sea state. This begs the question, even if the carrier was sailing at top speed, such severe pitching just doesn't seem optimal. After all, she is expected to sail into the wind at top speed during launch operations, and I wonder if this would present a rather dangerous situation.

https://imgur.com/O4tcTzi

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I'm just a layperson -- barely above the level of a complete ignoramus (hence my username) -- but here's my take. The proof of the pudding is in the eating, and when it comes to this pitching question, the proof of the Vikrant is whether it can safely recover and launch fixed-wing aircraft. I've watched videos of the recent Tejas recovery/launch and MiG-29 recovery on the Vikrant, and these operations seemed to proceed smoothly and uneventfully, without any pitching of the ship perceived by me. So at least under the conditions shown in the videos (calm seas, good weather, daylight), I believe the Vikrant passes the test.

by78 said:

This begs the question, even if the carrier was sailing at top speed, such severe pitching just doesn't seem optimal. After all, she is expected to sail into the wind at top speed during launch operations, and I wonder if this would present a rather dangerous situation.

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Well how severe is "severe" tbh. There is method to calculate ship squat. you can start from there.

Fulcrum007 said:

One believes what he wishes to believe. The ship is not fully loaded btw.

Regardless, that is why sea trials exist, which the ship has gone through consistently. Any such "problem" would have been noticed and informed aptly to the builder. I am sure the people handling such stuff are more qualified than screen-amateuer experts.

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Stealthflanker said:

Well how severe is "severe" tbh. There is method to calculate ship squat. you can start from there.

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So this doesn't look at least a bit alarming to you, your faith in squat calculations and trust in India's expertise notwithstanding? And how does come into play when the ship is sailing on high seas, instead of puddling around in shallow waters?

by78 said:

So this doesn't look at least a bit alarming to you, your faith in squat calculations and trust in India's expertise notwithstanding? And how does

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come into play when the ship is sailing on high seas, instead of puddling around in shallow waters?

https://imgur.com/4hb2ARd

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I think it's a bit early to make a big statement on the ship's inherent stability (which in turn is about its seaworthiness) so relatively early on in its life.

IMO it's something to track and monitor going forwards as the years go, but I don't think it's fair to make any big calls for now.

by78 said:

So this doesn't look at least a bit alarming to you, your faith in squat calculations and trust in India's expertise notwithstanding?

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How do i even know if it's alarming in the first place ? I think i mentioned that :
1.What's speed she is travelling ?
2.What's her loading condition ?
3.Well the depth of the water.

All can be said from the picture is that she appears to be either lightly loaded at front or travel at high speed maybe at speed equivalent to her natural hull speed.

Those questions needs to be answered first before getting alarmed in the first place.

And how does squat effect come into play when the ship is on sea trials, instead of puddling in shallow waters?

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How deep is the sea where she travels ? Or maybe i should mention things other than squat like Wavemaking resistance which then relates to how fast she travels. Which clearly you dont know.

Blitzo said:

I think it's a bit early to make a big statement on the ship's inherent stability (which in turn is about its seaworthiness) so relatively early on in its life.

IMO it's something to track and monitor going forwards as the years go, but I don't think it's fair to make any big calls for now.

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The one thing you can't change about a ship is its hydrodynamics which is determined by the hull. If this is the state of their ship stability, then this is what they have until the ship is scrapped or reworked.

FairAndUnbiased said:

The one thing you can't change about a ship is its hydrodynamics which is determined by the hull. If this is the state of their ship stability, then this is what they have until the ship is scrapped or reworked.

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How do you determine ship stability ?

Like for what i understand so far there is a concept of metacentric height, which determines how a ship hull is rolling. if GM is too high the ship will roll slowly and it will take longer for it to roll back to initial condition. too low and the ship will quickly rolls to side and return as fast it will be rough. The problem is that there is no real "standard" for this. each ship have their own value and it can be depend on condition.

Stealthflanker said:

How do i even know if it's alarming in the first place ? I think i mentioned that :
1.What's speed she is travelling ?
2.What's her loading condition ?
3.Well the depth of the water.

All can be said from the picture is that she appears to be either lightly loaded at front or travel at high speed maybe at speed equivalent to her natural hull speed.

Those questions needs to be answered first before getting alarmed in the first place.

How deep is the sea where she travels ? Or maybe i should mention things other than squat like Wavemaking resistance which then relates to how fast she travels. Which clearly you dont know.

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For her bow to rise up like that would require her to exceed her hull speed, which in turn likely exceeds her top speed by a fair margin.

Her total length is 262 meters, and her waterline length is likely no less than 90% of her full length, which would make her hull speed to be between 36 to 37 knots. Surely her engines can't push her to that kind of speed even when empty and to make her ride her bow wave like that.