Titanic tourist sub goes missing sparking search

[tridacna]

So when do you folks think the movie about this tragedy will be coming out? Is the ending going to be different, a happy ending, or the same? The proceeds I believe should go to the victims' families (except the dipshitt CEO).

Do the victim's families really need monetary compensation?

 

[BackAfter30]

The nuts and bolts and wrenches but the combustion chambers volumes and the stuff that on the design side in metric, right?
Even the US made cars don't give the engine size in gallons or ounces but in liters or cc, no?
AFAIK, companies like Tesla buy lots of components from Europe and Asia. If all your development is in imperial, it would be a major PITA to use a different system than all your suppliers.
I don't know anything about ship building though.

You're right, I don't remember ever seeing combustion chamber volumes in anything other than CCs. Current engine sizing though? For instance, a 5.7L engine isn't 5.7L becaust that was the design goal, it's becasue that is the metric equivalent of 350 cubic inches. The common US V8s are 7.4L or 6.2L or whatever based on imperial bore and stroke measurements. 2.0L, 3.0L, yep, totally right...but not 5.0, that's from a 302.

 

[BackAfter30]

And here is the point!
You continue to talk about "force".
Force is not relevant for explaining what happened or for assessing the amplitude of the sound pressure pulse generated by the implosion.
The relevant physical quantity is energy, which can be expressed in many different units.
If you do not like Joules or kg of TNT, we can express this quantity in other units.
For example, 95 kg of TNT are equivalent to 1100 kWh.
Or, if you prefer to use British Thermal Units (BTU), it is equivalent to 3700000 BTU.
Problem is not units, it is using force instead of energy.

My apologies, I know better than that, you're right about force and energy, of course.

But you're critique is still way off point.

 

[Rick Brant]

Other than defence products, what's still made or designed in the US these days anyway?

This proves at least one of them has a sense of humor.

 

[Wookie]

The nuts and bolts and wrenches but the combustion chambers volumes and the stuff that on the design side in metric, right?
Even the US made cars don't give the engine size in gallons or ounces but in liters or cc, no?
AFAIK, companies like Tesla buy lots of components from Europe and Asia. If all your development is in imperial, it would be a major PITA to use a different system than all your suppliers.
I don't know anything about ship building though.

Interesting concept.

I looked up the GE LM2500 gas turbine.

Ratings are a hodge podge.

Net Output in MW
Net Heat Output in both BTU and kJ

US designed engines are in Cubic Inches, but it's where Americans first learn Metric, as newer US cars and foreign designed US built cars are rated in Liters, Horsepower, and miles (statute) per gallon (US, not imperial).

Ship Building in the USA is protected by a system called the Jones Act, so ship builders/designers do not have to learn metric. I buy cable by the foot, and official ship measurements are in feet, and pounds and tons, yet cargo is in metric tonnes and cubic meters.

 

[captain]

According to the USG Rear Admiral the debris field is quite large and the carbon composite hull was not seen, perhaps blown out into pieces. Only the titanium end caps found intact. That would indicate a loud bang to me. As the Admiral described, it’s a catastrophic event with a significant broad band sound.

I just ran across some astonishing info. There has been much talk about the forces involved in an implosion at the depth of failure. I've been unable to understand what kind of forces we are talking about when a catastrophic implosion occurs.

According to an article in US Naval Institute Proceedings Magazine, USS Thresher imploded at a calculated depth of 2400ft with a force equivalent to 22,500 pounds of TNT. That would be 1.125KT. The Hiroshima weapon was estimated at 15KT. Tactical nukes can be in the sub 1KT range. W25 is reported to be 1.7KT.

I understood that we're talking about huge pressure, but I didn't realize the violent nature of the actual event.

Thresher Freedom of Information Act Request Yielding Results

In a partial response to a FOIA request, the U.S. National Archives released a photo essay of pictures from the search for the Thresher in 1963–1964.

www.usni.org

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".

 

[captain]

As stated, Germans invented rockets.

Then we taught them how to think in inches, feet, and pounds, and BAZINGA! We have nuclear weapons, nuclear reactors, and Saturn V.

Actually American John Goddard invented the liquid fueled rocket that put men into space.

 

[Wookie]

Actually American John Goddard invented the liquid fueled rocket that put men into space.

OK, I give.

 

[Twoblues]

This why not much will be left to find except hard parts like the structure in mangled states.

 

[Twoblues]

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".

The liability (three pages) form reads like , they are agreeing to ride a machine that's destined to fail catastrophically! If you are a test pilot at least you have a reasonable feeling that you can survive the maelstrom in a machine built to take punishment!