And coming to the origin of my question:
Why cycling drafting was ilegal some time ago?
I'm not 100% sure but I think that it was because if you draft
1. You have the pace marked by the other.
2. The other "cuts the air" for you, so you have less air resistance
In the case of swimming drafting (right behind another) point 1 is the same, but ponit 2 is much
more crucial:
air density is 1,29 kg/m3 and water densisty is 1000kg/m3. This is, water is 775 times more
dense than air.
In addition to water cutting, the head swimmer creates a flow behind him in the sense of the
movement. You can test it by putting a bouy behind a swimmer and see how the bouy follows
the swimmer.
For me, those would be reasons enough to ban swimming drafting if there was a practical way to
control it. That's my humble opinion.
Jordi Bataller