2. We know it's possible for an aircraft to fly at angle to the
direction in which it's pointing. Does anyone know why does such a
thing not happen in boats or ships? After all, both ships and
aircrafts use media to float on... any sailors here could answer that,
I guess

In addition to the issue of boats traveling through water with a current,
there is actually the issue of sailboats traveling through the water at a
different angle from which they are pointed due to the push on the sail.
This slip angle creates an angle of attack on the centerboard, daggerboard,
or keel to provide an opposing force.

John Bell
www.cockpitgps.com