Hi Hans......
Apparently these people don't realize that the weight would be distributed over the entire surface of the sledge that the rock is on. That great reduces the amount of weight on any one particular board. There are also images from Egypt showing these great stones, statues, and obseliks being transported on wooden sledges.
This page might be of interest and assistance to you:
[
hbar.phys.msu.su]
And by all means let's not forget the famous image shown on this page:
[
weekly.ahram.org.eg]
And don't forget the Peter the Great statue
[
www.ccs.neu.edu]
"It seemed it would be impossible to deliver the
1,600-ton monolith to St.Petersburg. However, an unknown Russian blacksmith
found a brilliant solution: he suggested that the rock should be raised by
levers, mounted on a platform of logs and rolled on copper balls along rails
with grooves (more than 5 miles) to the shores of the Gulf of Finland from
whence a specially constructed barge delivered it to the square by the
Senate."
While metal was used for the balls it should be noted that this 1600 ton stone was placed on a platform of
logs .... apparently compression of the wood wasn't a problem...
Kat
Ma'at Moderator
Founder and Director of The Hall of Ma'at
Contributing author to
Archaeological Fantasies:
How pseudoarchaeology misrepresents the past and misleads the public
"If you panic, you're lost" -- W. T. 'Watertight' Southard