(Ramapriya) wrote in news:30a8759c.0411070850.371c210
@posting.google.com:

1. If the principles of flight are universally applicable, why is it
that birds don't stall or spin? I wonder especially because I'm sure
I've seen some gulls hover in mid-air doing pretty much nothing except
having their wings spread!

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

Ramapriya


Humming birds don't stall in stationary flight because their unique wing
movements creat vortecies above and below their wings. The vorticies move
air across the wings, and so they always have a forward relative wind, evan
when hovering.