snake has to be 4 times plus 5 feet longer than human meal so for example...

5'9 human meal would mean the snake would have
to be 5x4=20 feet and then 9x4= 36inches or
yet another 3 feet plus again the 5 feet plus
so for a human at 5'9,the snake would have to
be 28 feet or so...but also twice the weight
of the human also so say this 5'9 human happen
to weigh 155 LBS so the snake would have to be 310LBS.

It is also when the snake is eating the human meal that the human is turned on its side and
this is not only being eaten feet first but
also head first,to get over the shoulder
blades especially!

this is all realistic in realities of any
human to be swallowed by a big snake as
its meal!!

http://www.cmwalters.deviantart.com/