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Don't Panic
- Joined
- Mar 1, 2004
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- 4,204
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- Oregon
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- Alien
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- functional atheist; theoretical agnostic
One of my jobs in the Navy was to measure ship's flexure.
The submarine, made of HY80 steel, would dive beneath the waves and still twist a measurable amount just from the way water's forces struck different parts of the sub with different vectors. We had to measure the twisting to keep our missile accurate when we launched. The amount was small, but my point is that just floating in the ocean, it twisted.
Hell, we used to measure the flexure in the dry dock, then watch the ship twist just from being lifted when they sank the drydock to float the submarine.
This was over about 100 feet of 3/4 inch steel. The twisting on the ark would be much worse: 450 feet of wood. The weight distribution will be unequal, the forces at the surface that much greater, the timbers will twist like matchsticks. Even if individual frames and panels and planks might not snap like twisted matchsticks, the hull's watertight integrity will suffer as the planks part and water rushes in.
But aside from the salt-water-activated flotsam generator, there's other problems.
I once calculated the deck space of the ark to match 18 high school basketball courts. So imagine 18 religious high schools setting up an experiment. In each basketball court, set up cages to hold 100 sheep (someone told me that the average size of the animals on the Ark would be that of a sheep... As if that makes the three species of Elephants easier to deal with), and food for the sheep for one year.
Give them access to fresh water as necessary. Each day, allow each school to let 8 volunteers into the court to take care of the animals. Distribute food, remove waste, fix and repair cages, inspect animals for wounds or disease, etc. They have one hour. The next school cannot start their hour until the previous school finishes and evacuates the court.
This simulates Noah, three sons and their four wives working an 18 hour day to keep the arkanimals alive and healthy. See if they can manage it for a year.
To be more accurate, should probably demand that two people work some sort of bilge pump at all times during their hour, doing absolutely nothing but pumping leaks back over the side to keep the barge afloat.
Thank you Keith for explaining clear your professional findings. Despite my position to the Ark I will honestly find this interesting.
(Ok joedad you got me !)
FWIW, I have a stale Electrical Engineering degree from the 1980's, and it does take more than just a simplistic 'just build it bigger' to deal with the physical forces operating on such a scale. Maybe if you consider a paper airplane that you can make. I used to do that quite a bit as a kid, skinning fast moving ones, and floppy slow circling ones. However, just try to build a Yuuuge one that just doesn't fall like a paper blob. Anyway, here are some sites that talk at least generally about the issue of trying to engineer a wooden ship so big:
The Wyoming was a mostly wooden ship at the length of the purported Ark. It had a coal fueled steam engine. However, that was not for propulsion, but for the pumps to deal with the massive water leakage from the huge wooden hull even with steel bracing.
http://www.uh.edu/engines/epi2492.htm
Wyoming's designers had likewise stiffened her with internal steel bracing, but she was too big. She still bent and twisted at sea. Gaps opened in her planking and let water in. Normally her pumps could handle the leakage, but the Pollock Rip storm was too much. She sank, taking thirteen sailors down with her.
Ship builders have known since at least 1900 that 100 meters is near the practical limit nearly (notice that they still had steel/iron reinforcements) pure wooden ships:
https://skeptoid.com/episodes/4279
llow me to explain. What's known as the square-cube law is pretty familiar: increase an object's dimensions, and its surface area increases by the square of the multiplier, and its weight increases by the cube of the multiplier. But one extension of this law is less familiar. When we scale up an object — take a wooden structural beam as an example — the strength of the beam does not increase as fast as its weight. Applied mechanics and material sciences give us all the tools we need to compute this. In summary, the tensile strength of a beam is a function of its moment and its section modulus. No need to go into the complicated details here — you can look up beam theory on Wikipedia if you want to learn the equations. Scale up a simple wooden beam large enough, the weight will exceed its strength, and it will break from its own weight alone. Scaled up to the immense size of Noah's Ark, a stout wooden box would be unspeakably fragile.
<snip>
Even so, these wooden ships had a great advantage over Noah's Ark: their curved hull shapes. Stress loads are distributed much more efficiently over three dimensionally curved surfaces than they are over flat surfaces. But even with this advantage, real-world large wooden ships have had severe problems. The sailing ships the 100 meter Wyoming (sunk in 1924) and 99 meter Santiago (sunk in 1918) were so large that they flexed in the water, opening up seams in the hull and leaking. The 102 meter British warships HMS Orlando and HMS Mersey had such bad structural problems that they were scrapped in 1871 and 1875 after only a few years in service. Most of the largest wooden ships were, like Noah's Ark, unpowered barges. Yet even those built in modern times, such as the 103 meter Pretoria in 1901, required substantial amounts of steel reinforcement; and even then needed steam-powered pumps to fight the constant flex-induced leaking.
Of course one can stick to the steady stream of magic cards to keep the fairy tale afloat...but this still requires a trickster god, willing to fake a reality that isn't there as the geological record screams 'no world covering deluge' loud and clear.