"All of Vlad's forces and all of Vlad's men, are out to put Humpty together again." (10 Viewers)

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GTX said:
www.abc.net.au

Ukraine peace deal could be presented to Russia within days: Zelenskyy

Marathon talks between the US and Ukraine led to "not perfect" but "very workable" framework that could bring to an end Russia's near four-year-old invasion, the Ukrainian president says.
www.abc.net.au www.abc.net.au

I predict this will not happen if it is fair. Russia won't accept unless they feel that they are winning.
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Russia does not want peace. Russia wants land. A peace deal would cap that war aim.
 
Denniss said:
not so good news regarding the sub - no direct hit but a near miss. May stil have caused shock damages to sensitive equipment
newsukraine.rbc.ua

Ukrainian military pushes final phase of Kupiansk operation amid fierce Russian resistance

Read more
newsukraine.rbc.ua newsukraine.rbc.ua
other opinion

View: https://mastodon.social/@MAKS23/115728942373151040
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Yeah, the underwater explosion needn't contact the hull to cripple or sink the boat. Water-hammer can do the trick, and historically has, against subs.
 
Thumpalumpacus said:
Yeah, the underwater explosion needn't contact the hull to cripple or sink the boat. Water-hammer can do the trick, and historically has, against subs.
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And, like on aircraft, the area aft of the rear pressure bulkhead is much "weaker" as it does not need to withstand the high pressure differentials that the pressure vessel does. Outside the pressure vessel the only loads are manoeuvring so it only needs enough strength to deal with that.

Inside the pressure vessel on an aircraft the pressure load is typically around 8psi which is 1150 lb/sq ft or 10,300 lb/sq yd.

Submarines have a vastly greater pressure differential. At 100 ft/30m the pressure differential is just over 3 atmos or 44psi. Wiki says Kilo subs can go to 300m where the pressure is going to be ten times that - ie 30 atmos/440 psi. It takes a very strong structure to withstand those pressure differentials.

I would be surprised if the sub was not seriously damaged.
 
MiTasol said:
And, like on aircraft, the area aft of the rear pressure bulkhead is much "weaker" as it does not need to withstand the high pressure differentials that the pressure vessel does. Outside the pressure vessel the only loads are manoeuvring so it only needs enough strength to deal with that.

Inside the pressure vessel on an aircraft the pressure load is typically around 8psi which is 1150 lb/sq ft or 10,300 lb/sq yd.

Submarines have a vastly greater pressure differential. At 100 ft/30m the pressure differential is just over 3 atmos or 44psi. Wiki says Kilo subs can go to 300m where the pressure is going to be ten times that - ie 30 atmos/440 psi. It takes a very strong structure to withstand those pressure differentials.

I would be surprised if the sub was not seriously damaged.
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My understanding, and definitely subject to correction, is that the sub was docked, meaning that the water pressure was 1AT until you get below 15'. But even without the atmo pressure, water doesn't start to compress until around 30,000 psi, which makes it an excellent conductor of pressure waves.

If so, some of the explosive pressure surely vented to the surface and dissipated, but once that shock wave is ten foot below the surface, it's going to hurt that sub. It's the same reason that near-misses onto ships in WWII were at times fatal. Water is very unforgiving.
 
MiTasol said:
It is way out of my expertise but the shock wave rebounding off the pier onto the sub would, I expect, be significant as well. I would think the effect of the pressure wave on the fins to create a very significant twisting moment as well.
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I hadn't even considered either of those two points, and they're likely important as well.
 
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