Before we leave the question of the size of the ark and how many animals could realistically fit into it, there are a couple of points I would like to make.
In Talk Reason, an Evolutionist web site, the weight of the ark with the occupants inside was addressed.
"Ignoring the weight of the ark itself, it could be loaded, barely escaping sinking, with the weight of no more than about five hundred million Newton. (Newton is the standard unit of weight used in science. Roughly, one pound is close to 4.45 Newton; on the earth surface, a mass of one kilogram weighs about 9.8 Newton). The animals gathered in the ark would have weights varying in a wide range, from a fraction of a Newton for some insects, to hundreds of thousands of Newtons for such giants as elephants and hippopotami. Just for a rough estimate, accept the average weight of an animal to be close to that of, say, a horse, which is about ten thousand Newton. Five hundred million divided by about 10,000 is close to 50,000. This is a very rough estimate of the maximum number of tightly packed animal bodies the ark could accommodate barely escaping sinking, even ignoring the weight of the ark itself and of the vast amount food to be stored in it. Accounting for food and the vessel's own weight, the maximum number of tightly packed animals bodies the ark would handle barely avoiding sinking must be estimated closer to 20,000. That is no more than about 10,000 species, if each species were represented by only one male and one female. Since animals and people needed some free volume around them to survive, a realistic estimate of the number of species the ark could support must be between several hundred and at the most a couple of thousand."
They used the weight of a horse but I will revert back to the sheep used in previous discussions.
An average sheep weighs about 175 lbs. Converting this to Newton, a measurement of force used by Talk Force in the quote above, knowing that 1 pound is about 4.45 Newton, makes one sheep about 780 Newton.
Since, in my calculation last week, I concluded that about 30,000 sheep that could fit on the ark, this makes their total "weight" about 23,400,000 Newton. This is much less than the overflowing capacity given in Talk Reason of 500,000,000 Newton. Their argument loses its' impact when a closer and more realistic estimation of animals is used.
It was also remarked in our discussion, that "if the Ark was as large as tanker and made out of wood (as the Bible says), it would not float because it would be prone to leaks."
Noah was directed by God in Genesis 6:14 to "make thee an ark of gopherwood; rooms shalt though pitch it within and without with pitch."
These specific instructions weren't without reason. Although I found "gopherwood" listed in various sites such as Tree Trail, this is an American yellowood that is brittle in storms. It would have not been suitable for shipbuilding.
The tree found mentioned in the Bible would have to be sturdy and buoyant. The original tree was possibly a type of cypress as the word "gopher" itself is translated as cypress by some Hebrew scholars.
Cypress is a resinous type of wood that was used in shipbuilding in antiquity. As the wood was specified as gopherwood by God; it can be reasonably deduced that this would have been the most suitable for the ark.
The ark was to be covered in pitch, which would have provided waterproofing. This pitch would have been derived from trees, probably pine. This product has been found by archeologists on ancient ships.
Discussing Creationism Part I