Now, you see when I am talking of speed I am essentially taking about Froude number, not
speed as such; that is, if I have a container ship which is said 250 meters long, one of the
larger container ships, it can move at 24 knots. Now, what I do is I geometrically bring the
ship down in size, instead of 250 meters, now, let me see I bring it down by half to 125
meters- every dimension reduces by half- if that was moving at 24 knots, will this ship move
at 24 knots, would it mean that it will move at 24 knots? The answer is no, it will move at a
speed which will be at the corresponding speed that means, it will move at 25 divided by root
2 because the scale is two, so that optimum speed will be 25 divided by 1.414, which will be
something like- what?- 17, 18 knots, of that order.