Titanic tourist sub goes missing sparking search

[Angelo Farina]

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.

These devices were all designed by teams of engineers and scientists using SI, not crap imperial units: Basics of Space Flight - Solar System Exploration: NASA Science

 

[Dan]

But as a naturalized US citizen, I did laugh when I first heard that "inches, feet and pounds are measurements only used in countries that have put people on the moon...."

Brittish revenge after US kicked their butts in 1776.

 

[Angelo Farina]

Nah - we went to the moon and back a few times using the imperial system.

The Apollo program was entirely done using SI units.
The usage of imperial units in space programs caused some big errors, the most famous one was the crash-landing of the Mars Climate Orbiter: How NASA Lost a Spacecraft From a Metric Math Mistake | SimScale

 

[berndo]

And who says the Germans don't have a sense of humor?

I know Mericans use the term 'engineer' very loosely. An engineer to me is somebody who designs sophisticated mechanical or electrical components. Why would any scienctiest or engineer use an inferior system that nobody uses?
Other than defence products, what's still made or designed in the US these days anyway?

 

[Angelo Farina]

I don't think engineers in the US use inches and feet.


Sometimes you use what's there instead of making new stuff. DIN is German but the thread is imperial.

Not exactly. DIN thread is 5/8 - 14 BSP (British Standard Pipe). That is different from imperial threads used in US.
It is a relic of the past, but DIN standardised it because that thread was common here in Europe.

 

[berndo]

Not exactly. DIN thread is 5/8 - 14 BSP (British Standard Pipe). That is different from imperial threads used in US.
It is a relic of the past, but DIN standardised it because that thread was common here in Europe.

If the British 5/8 and the other old British units are not imperial what are they?

 

[BackAfter30]

As said, the only physical quantity relevant for evaluating an explosion/implosion is the energy released, which I estimated at the best of my (limited) knowledge.
If you can provide a better estimate of this quantity, please post your data.
Computing the total force on the vessel is meaningless, as the force is distributed on a convex shape, hence its resultant is null.

If you go back and look at my post, you'll see that it was simply subjectively relating the forces involved to a (for some folks) more understandable expression of those forces. I didn't say your calcs were wrong, simply that they were off point related to my post.

 

[Angelo Farina]

If the British 5/8 and the other old British units are not imperial what are they?

The difference is in the thread angle.
The BSP standard uses a thread angle of 55°.
In US the threads have a 60° angle...

Thread angle - Wikipedia

en.wikipedia.org

 

[BackAfter30]

The Apollo program was entirely done using SI units.
The usage of imperial units in space programs caused some big errors, the most famous one was the crash-landing of the Mars Climate Orbiter: How NASA Lost a Spacecraft From a Metric Math Mistake | SimScale

The fact that imperial units were used at all was the trigger; they probably had no business being in the project at all. It was a project management/system engineering failure that allowed that trigger to result in the loss of the vehicle.

 

[Wookie]

I don't think engineers in the US use inches and feet.

Interestingly, I work in ship design and repair.

Yes, we still use inches and feet, and have imperial wrenches, as well as adjustable wrenches for the crap that slipped by the Buy American program.

The LCS ships are designed in imperial, built in imperial, using commercial off the shelf products that are not subject to Buy American. The German Renk Reduction gears are junk, causing the US Navy to scrap 9 ships less than 10 years old. The diesels are Colt-Pielstick, and we have to bring in tech reps from France, because they just aren't rigorous enough for the job. The Chinese wiring supplied doesn't meet Mil-Spec. So it isn't tinned marine copper, its household copper crap, stranded, but not tinned, resulting in miles of replacement cabling.

Meanwhile Bath and Ingalls built destroyers and carriers are designed and built to last 50 years. They ain't cheap, but they are cheaper than scrapping them every 10 years because the foreign built crap isn't strong enough. Even after they are bombed (Cole), torn up in a collision (Fitzgerald, McCain), or burned in an industrial fire (Oscar Austin) they are worth repairing instead of scrapping.