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The question of just how an ancient civilisation — without the help of modern technology — moved the two-tonne stones that made up their famed pyramids has long plagued Egyptologists and mechanical engineers alike. But now, a team from the University of Amsterdam believes they have figured it out, even though the solution was staring them in the face all along.
It all comes down to friction. See, the ancient Egyptians would transport their rocky cargo across the desert sands, from quarry to monument site with large sleds. Pretty basic sleds, basically just large slabs with upturned edges. Now, when you try to pull a large slab with upturned edges carrying a two-tonne load, it tends to dig into the sand ahead of it, building up a sand berm that must then be regularly cleared before it can become an even bigger obstacle.
Wet sand, however, doesn’t do this. In sand with just the right amount of dampness, capillary bridges — essentially microdroplets of water that bind grains of sand to one another through capillary action — form across the grains, which doubles the material’s relative stiffness. This prevents the sand from berming in front of the sled and cuts the force required to drag the sled in half. In half.
The physicists placed a laboratory version of the Egyptian sledge in a tray of sand. They determined both the required pulling force and the stiffness of the sand as a function of the quantity of water in the sand. To determine the stiffness they used a rheometer, which shows how much force is needed to deform a certain volume of sand.
Experiments revealed that the required pulling force decreased proportional to the stiffness of the sand…A sledge glides far more easily over firm desert sand simply because the sand does not pile up in front of the sledge as it does in the case of dry sand.
a guy at the front of the sled is shown pouring liquid into the sand. You can see it in the image above, just to the right of the statue’s foot.
originally posted by: ignorant_ape
a reply to: daaskapital
this however also requires a water supply to the route quarry > pyramids
and begs the question - does the energy expended creating the wetted haulway exceed the energy saved by the reduced friction of the wetted haulway ?
the lab experiment is fine as a demonstration of concept - but a real life experiment would be awesome - see how many 2 ton blocks an army battalion could move over a 1 mile course / day - and how much water is actually needed
originally posted by: Yusomad
a reply to: ignorant_ape
How much would reduced friction help you if the sled is not strong enough (hence the strong wood remark) to support whatever you put on it? If the sled becomes crushed because palm trees are not "real" wood, how is reduced friction going to get you anywhere?
originally posted by: Yusomad
So they have discovered how they managed to do something impossible to modern man.
To ask, what sort of hard wood would they use for the sleds? You cant use palm trees for that.
Also, what did they "discover", if all they have is yet another (shoddy) theory?
Not directed at you OP, just thinking out loud.
originally posted by: Aloysius the Gaul
originally posted by: Yusomad
So they have discovered how they managed to do something impossible to modern man.
Why is it impossible for us to do it??
originally posted by: Yusomad
originally posted by: Aloysius the Gaul
originally posted by: Yusomad
So they have discovered how they managed to do something impossible to modern man.
Why is it impossible for us to do it??
Im not here to educate you, or anyone.
There was a group of japanese scientists that tried to build a puny pyramid in the 80s-90s, they failed miserably.
Should you not have an inkling about the thread topic before you post in it?
originally posted by: Yusomad
a reply to: daaskapital
You heard the man give him some room.
To me it does not, its the same they have been pushing since the 80s when I was in school, sleds and liquid, that or ramps, which would need more material than the pyramid itself...
Im all for testing tho, let them show us how wrong we are.