Grossly increasing the factor of safety is a subtle way that science fiction stories connote a feeling of very advanced technology. For example in the JJ Abrams movie Star Trek Into Darkness we see the Enterprise operating at depth in an ocean, then dramatically zooming away into space. Then later another ship falls from orbital height and plows through San Francisco without losing its hull shape. In Star Wars the Mi…
About the Abrams movie: Too bad the same factor of safety wasn't applied to the buildings, where that should have been even cheaper. Your point is good though. Just like we're now starting to put wi-fi chips into absolutely anything just in case, why wouldn't an advanced civilization simply use their super strength nanoparticles for everything? Why go out of your way to use worse materials?
The most expensive number in engineering
61–70 of 176 posts
Re: The most expensive number in engineering
#62Earlier quoted context omitted.
Seems disingenuous to lump a science fiction movie where the focus is future technologies to an action movie with exaggerated physics and lack of real damage. In action movies, bad guys die with one bullet while the hero finds his way to safety (and survives!) despite having 10 or more lethal bullet wounds. For the record, Star Wars is not science fiction nor has it ever been portrayed as such. It's very much an acti…
> For the record, Star Wars is not science fiction nor has it ever been portrayed as such. FWIW this is literally the first time I’ve encountered someone claiming that it isn’t science fiction. ( Soft SciFi, to be sure, but still: https://tvtropes.org/pmwiki/pmwiki.php/Main/MohsScaleOfScien... )
Well, there's Science Fantasy [1]: Jedi and the Force are very much Wizards and Magic.
I've heard it called Space Fantasy, too.
[1]: https://tvtropes.org/pmwiki/pmwiki.php/Main/ScienceFantasy
Re: The most expensive number in engineering
#63Grossly increasing the factor of safety is a subtle way that science fiction stories connote a feeling of very advanced technology. For example in the JJ Abrams movie Star Trek Into Darkness we see the Enterprise operating at depth in an ocean, then dramatically zooming away into space. Then later another ship falls from orbital height and plows through San Francisco without losing its hull shape. In Star Wars the Mi…
About the Abrams movie: Too bad the same factor of safety wasn't applied to the buildings, where that should have been even cheaper. Your point is good though. Just like we're now starting to put wi-fi chips into absolutely anything just in case, why wouldn't an advanced civilization simply use their super strength nanoparticles for everything? Why go out of your way to use worse materials?
Re: The most expensive number in engineering
#64http://holyjoe.org/poetry/holmes1.htm
The Deacon’s Masterpiece
or, the Wonderful "One-hoss Shay":
A Logical Story
by Oliver Wendell Holmes (1809-1894)
Have you heard of the wonderful one-hoss shay, That was built in such a logical way It ran a hundred years to a day, And then, of a sudden, it — ah, but stay, I’ll tell you what happened without delay, Scaring the parson into fits, Frightening people out of their wits, — Have you ever heard of that, I say?
Seventeen hundred and fifty-five. Georgius Secundus was then alive, — Snuffy old drone from the German hive. That was the year when Lisbon-town Saw the earth open and gulp her down, And Braddock’s army was done so brown, Left without a scalp to its crown. It was on the terrible Earthquake-day That the Deacon finished the one-hoss shay.
Now in building of chaises, I tell you what, There is always somewhere a weakest spot, — In hub, tire, felloe, in spring or thill, In panel, or crossbar, or floor, or sill, In screw, bolt, thoroughbrace, — lurking still, Find it somewhere you must and will, — Above or below, or within or without, — And that’s the reason, beyond a doubt, A chaise breaks down, but doesn’t wear out.
But the Deacon swore (as Deacons do, With an “I dew vum,” or an “I tell yeou”) He would build one shay to beat the taown ’N’ the keounty ’n’ all the kentry raoun’; It should be so built that it couldn’ break daown: “Fur,” said the Deacon, “’tis mighty plain Thut the weakes’ place mus’ stan’ the strain; ’N’ the way t’ fix it, uz I maintain, Is only jest T’ make that place uz strong uz the rest.”
So the Deacon inquired of the village folk Where he could find the strongest oak, That couldn’t be split nor bent nor broke, — That was for spokes and floor and sills; He sent for lancewood to make the thills; The crossbars were ash, from the straightest trees, The panels of white-wood, that cuts like cheese, But lasts like iron for things like these; The hubs of logs from the “Settler’s ellum,” — Last of its timber, — they couldn’t sell ’em, Never an axe had seen their chips, And the wedges flew from between their lips, Their blunt ends frizzled like celery-tips; Step and prop-iron, bolt and screw, Spring, tire, axle, and linchpin too, Steel of the finest, bright and blue; Thoroughbrace bison-skin, thick and wide; Boot, top, dasher, from tough old hide Found in the pit when the tanner died. That was the way he “put her through.” “There!” said the Deacon, “naow she’ll dew!”
Do! I tell you, I rather guess She was a wonder, and nothing less! Colts grew horses, beards turned gray, Deacon and deaconess dropped away, Children and grandchildren — where were they? But there stood the stout old one-hoss shay As fresh as on Lisbon-earthquake-day!
EIGHTEEN HUNDRED; — it came and found The Deacon’s masterpiece strong and sound. Eighteen hundred increased by ten; — “Hahnsum kerridge” they called it then. Eighteen hundred and twenty came; — Running as usual; much the same. Thirty and forty at last arrive, And then come fifty, and FIFTY-FIVE.
Little of all we value here Wakes on the morn of its hundreth year Without both feeling and looking queer. In fact, there’s nothing that keeps its youth, So far as I know, but a tree and truth. (This is a moral that runs at large; Take it. — You’re welcome. — No extra charge.)
FIRST OF NOVEMBER, — the Earthquake-day, — There are traces of age in the one-hoss shay, A general flavor of mild decay, But nothing local, as one may say. There couldn’t be, — for the Deacon’s art Had made it so like in every part That there wasn’t a chance for one to start. For the wheels were just as strong as the thills, And the floor was just as strong as the sills, And the panels just as strong as the floor, And the whipple-tree neither less nor more, And the back crossbar as strong as the fore, And spring and axle and hub encore. And yet, as a whole, it is past a doubt In another hour it will be worn out!
First of November, ’Fifty-five! This morning the parson takes a drive. Now, small boys, get out of the way! Here comes the wonderful one-hoss shay, Drawn by a rat-tailed, ewe-necked bay. “Huddup!” said the parson. — Off went they. The parson was working his Sunday’s text, — Had got to fifthly, and stopped perplexed At what the — Moses — was coming next. All at once the horse stood still, Close by the meet’n’-house on the hill. First a shiver, and then a thrill, Then something decidedly like a spill, — And the parson was sitting upon a rock, At half past nine by the meet’n-house clock, — Just the hour of the Earthquake shock! What do you think the parson found, When he got up and stared around? The poor old chaise in a heap or mound, As if it had been to the mill and ground! You see, of course, if you’re not a dunce, How it went to pieces all at once, — All at once, and nothing first, — Just as bubbles do when they burst.
End of the wonderful one-hoss shay. Logic is logic. That’s all I say.
Re: The most expensive number in engineering
#65Re: The most expensive number in engineering
#66The article suggests using a probabilistic failure model instead of a large a safety factor, and explains how a safety factor established in the 1930s affected the cost of the Space Shuttle. But spacecraft might be a special case, where any additional weight is so expensive, and you also expect the models to be especially accurate and manufacturing to be extremely precise. For more everyday civil engineering, I think…
Re: The most expensive number in engineering
#67Earlier quoted context omitted.
Seems disingenuous to lump a science fiction movie where the focus is future technologies to an action movie with exaggerated physics and lack of real damage. In action movies, bad guys die with one bullet while the hero finds his way to safety (and survives!) despite having 10 or more lethal bullet wounds. For the record, Star Wars is not science fiction nor has it ever been portrayed as such. It's very much an acti…
> For the record, Star Wars is not science fiction nor has it ever been portrayed as such. FWIW this is literally the first time I’ve encountered someone claiming that it isn’t science fiction. ( Soft SciFi, to be sure, but still: https://tvtropes.org/pmwiki/pmwiki.php/Main/MohsScaleOfScien... )
https://scifi.stackexchange.com/questions/46481/did-george-l...
Because all the stories are " a long, long time ago in a galaxy far, far away," it's not even clear if Luke and the gang are humans or some other species. Of course it's easy to think of them as humans, and most people do, but it's not necessary. This ambiguity is also by design.
Re: The most expensive number in engineering
#68Earlier quoted context omitted.
I don’t think this is science fiction doing this to connote the future in many of these cases. The cars in the “fast” franchise also survive ludicrous damage. The bodies of action heroes survive falls from ridiculous heights and blows and stab wounds that would kill somebody with ease. This is more a property of action movies (and adventure movies, to a lesser degree).
Seems disingenuous to lump a science fiction movie where the focus is future technologies to an action movie with exaggerated physics and lack of real damage. In action movies, bad guys die with one bullet while the hero finds his way to safety (and survives!) despite having 10 or more lethal bullet wounds. For the record, Star Wars is not science fiction nor has it ever been portrayed as such. It's very much an acti…
Re: The most expensive number in engineering
#69The article suggests using a probabilistic failure model instead of a large a safety factor, and explains how a safety factor established in the 1930s affected the cost of the Space Shuttle. But spacecraft might be a special case, where any additional weight is so expensive, and you also expect the models to be especially accurate and manufacturing to be extremely precise. For more everyday civil engineering, I think…
Re: The most expensive number in engineering
#70If you had the luxury of throwing away bridges or planes or space shuttles to test every possible circumstance, then I guess eventually the safety factor could conceivably come down to 1.0, right? You would've satisfied yourself that nothing in the real world was not in your simulations?
> If you had the luxury of throwing away bridges or planes or space shuttles to test every possible circumstance, then I guess eventually the safety factor could conceivably come down to 1.0, right? You would've satisfied yourself that nothing in the real world was not in your simulations? Isn't that the main advantage Space X has over NASA?