Because the germans had put torpedo nets, either that or the RAF had thought
that torpedo nets would be there, he needed the bomb to hit the wall, then
sink to a certain depth before exploding, the idea being that the explosion
itself wouldnt actually burst the dam but it would cause lets say a space,
where the explosion was, and the water pressure as it took up the space
would do the damage., to do this, the bomb had to actually be ON the wall,
and by it hitting the wall at above the surface then sinking down the wall
this could be achieved.
"Hamisha3" wrote in message
...
Not to take anything away from BarnesWallis but why does a simple torpedo
not
do the same as the boune bomb, detonate against the dam wall at a pre
set
depth?

Thanks in advance
H.