Titanic tourist sub goes missing sparking search

[Capt Jim Wyatt]

I love how far off topic this thread is .. Anyway the USA put men on the moon several times & we saved Europe from speaking German.

 

[Wibble]

As an esoteric exercise I ran a Boyle's law calculation on the change in volume of the air in the sub at implosion

Assuming the inside of the sub was 5 feet in diameter and 15 feet long the interior volume would have been 785 cubic feet. Pressure in the sub was 14.7 psi ( normal atmospheric pressure).

If implosion depth was 11,500 feet, sea water pressure was about 5100 psi.

At the instant of implosion the internal air volume (785 cu/ft @14.7 psi) would have been compressed to 2.8 cubic feet at 5500 psi.
Not a lot of room for 5 bodies in 2.8 cubic feet. That is equal to a box about 17" x 17" x 17".

If only you'd used Bar.

Volume -- use your 785 cubic feet -- at 1 Bar (=ATA) pressurised to 400 Bar = 785/400=1.9625 CF.

Now I wonder what the temperature of that would be...
Throwing that into a calculator, the temperature would be raised from 10C / 40F to 1295C / 2363F

Not only are they instantly crushed, but they're incinerated too

That steam release and subsequent condensation would not help things - explosion?

 

[captain]

It is even worst. Your calculation is quasi-static.
And unnecessary complex. If external pressure at 4000m depth is 400 bars, the internal volume will become 1/400 of the original volume.
But the event was highly dynamic...
The shell parts were accelerated towards the center, were air and corpses were compressed. Due to inertia, the compression reaches a peak pressure several times larger than the external pressure, so in the maximum compression instant the inner pressure has peaked somewhere around 1000 bars (2.5 times the external pressure of 400 bars).
Perhaps even more.
So the inner volume of the shell was instantaneusly reduced to 1/1000 of the original value.
But as the compressed material is elastic, after reaching that very high pressure peak, the compressed material did expand back, projecting small chunks of the shell and its contents all around.
Only very hard parts, such as the titanium domes, could have survived the secondary explosion.

Any thoughts on the heat of compression. Never mind.

 

[Angelo Farina]

Any thoughts on the heat of compression. Never mind.

Yeah, actually it was adiabatic compression.
So no heat exchange.
So using p×V= constant is wrong.
It is p×V^n=constant
n is around 1.4
So doing the math V2=V1×(p1/p2)^(1/1.4)
If V1 was 10 m3, at 400 bars V2 is 0.138 m3.
Regarding temperature, the adiabatic relationship is p×T^(n/(1-n))=constant.
Hence T2=T1×(p1/p2)^((1-n)/n)
If T1 was 283 K (10 °C) T2 results to be 1623 K = 1360 °C.
The corpses were vaporised instantaneously...

 

[makar0n]

And unnecessary complex. If external pressure at 4000m depth is 400 bars, the internal volume will become 1/400 of the original volume.

And this is why I love metric.

And scuba related..
Calculate cylinder volume in metric:
Step 1. Multiply liters x bars.
Calculate cylinder volume in imperial:
Step 1. Find somebody with a calculator


Aaaaaanyways, are memes ok yet or are we still och so serious ?

 

[wetb4igetinthewater]

I love how far off topic this thread is .. Anyway the USA put men on the moon several times & we saved Europe from speaking German.

Who took Berlin? My Russian wife's grandfather didn't see any Americans when he was there.

 

[Capt Jim Wyatt]

Who took Berlin?

Who took the Berlin wall down? RR.

 

[makar0n]

Hmm ok gonna test the waters...

 

[Joneill]

Q

Now back on topic perhaps, since I am eagerly waiting for the meme "ban" to be lifted...
And in the meantime more fun from Reddit:

www.reddit.com/r/facepalm/comments/14hff09/oceangate_ceo_stockton_rush_email_exchange_with/

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Almost like the CE bashing around here

Wow - this guy was amazingly arrogant and he ultimately paid the price for his ill-fated approach. I have no sympathy for him at all.

Too bad others bought into his BS as well - though some should have know better. I feel bad for the 19 year old who was, apparently, terrified of the trip and only did it for his dad… sad.

 

[Angelo Farina]

Hmm ok gonna test the waters...

View attachment 789329

The Titan was never claimed to be a submarine.
It was labelled a "submersible", but here in Europe this kind of vessel is named a Bathyscaphe: Bathyscaphe