Scott Bachelor wrote:

Jere,

The ability to trasmit and receive thru the hull would be a great feature,
but to get the beams looking forward through the hull will be difficult.
The hull material will severely degrade the acoustic signal and not allow us
to produce the high resolution images. We are trying to minimize the size
of the transducer to allow easier placement of the unit.

Thanks,

Scott
"Jere Lull" wrote in message
...

In article ,
"Scott Bachelor" wrote:


I am working with a company (www.blueviewtech.com) to commercialize a
low-cost high-definition imaging system. I am looking for
feedback/suggestions from boaters who have experience with other FLS

type

sonar. In particular, I am interested in your experience with the
different mounts (transom vs. thru-hull) for these system. This

feedback

will be very helpful in shaping the companies first recreational boating
high-definition imaging sonar product.



Add, or market, a third option: Shooting through the hull. Most of the
time, we want the sensor forward, but not put a hole in the hull. Most
transducers work if properly sealed to the hull; you'll want to ensure
yours does.

A particular need is to see just in front of the boat and 4-8' down -- a
close to horizontal pattern. The only use I can see is when I am trying
to nose into a narrow channel. Anything deeper than the keel is safe.

And it should transmit NMEA info for relay on other instruments.

Other than that, be careful not to advertize the product here if/when it
comes to market, as that's a no-no.

--
Jere Lull
Xan-a-Deux ('73 Tanzer 28 #4 out of Tolchester, MD)
Xan's Pages: http://members.dca.net/jerelull/X-Main.html
Our BVI FAQs (290+ pics) http://homepage.mac.com/jerelull/BVI/



Any sonar expected to provide a visual representation or zoned
alarms of the underwater ahead will use an array of at least 2 or 3
sonar receiver sensors, displaced in two dimensions wrt the expected
field of view. The image will be constructed from a computer time
analysis of bipolarised paired pulse signals, using gated time
differences to effectively scan locations for returns. You don't
need great resolution to spot rocks big enough to hole your boat at
say, 50 feet. In suspect waters, you should be going slow. Charts
would be cheaper. Lost containers and high seas speed would
complicate matters, requiring violent autopilot turns without
warning to provide any benefit to speeders.

We ain't likely to see this technology until all of our so called
"enemies" figure out how to do this on their own, and start mass
producing it for consumers.

The Chinese will be the ones to make money on this, considering
modern American industrial practices which now seemingly extend even
to military-industrial concerns. Or is a military-industrial mindset
a common plague? What enemies? No-one will win any war involving
boomers,except those who sell them.

If you were to write a program to do this (and that would be the
hardest part) the CIA would put you in jail.

All in the name of paranoia, eh?

Terry K