[Richard Webb[_3_]]

On Mon 2012-Feb-27 11:04, Scott Dorsey writes:
I'm wondering what his interest is, whether he's just dabbling or he has an
academic interest of some sort. IF the later I'd think he'd
have already cracked a book or two on the subject.

There is an outrageous amount of information on the subject in open
publications from the US Navy. A lot of it has to do with very
fancy propeller designs. Expensive propeller designs, mind you,
which is why you don't see them on merchant marine vessels.

iNdeed, I've read some on it over the years.

The Navy wants to build ships that aren't audible on passive sonar
receivers. Incidentally, some of the problem with building very
quiet ships is that animals run into them.

Yep, and that was an assumption I made when i first read
about this way back, as animals that live in the sea would
have to use other senses than vision to move about reliably
and safely.

snip

Here in this group most of us
have a better grasp of acoustic characteristics of air

It's amazing how the physics are the same. The reason I got
interested in it is because almost all of the research on large
phased array microphone systems is Navy-financed stuff. Beamforming
in air is really interesting and a lot of the ocean work can be
applied to it.

INteresting. I knew the USN was financing a bunch of phased array mic research, but hadn't really thought about that
much. Quite interesting, thanks!

Regards,
Richard
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