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Sorry David I was thinking sonar and pinging off oncomming
objects. On reading again I see you're picking up the sound.
When diving I listen before I surface, and can hear boats
from a reasonable distance, so I think there would be merit in
this
system. It's more difficult to determine direction of
sound when underwater and your unit would do that better than a
diver
could. I haven't given a lot of thought to collision on
surfacing other than that I may have a dive flag on a pole or another
alternative is what Brent Shaws
"dry dive" has, a camera on a periscope.
The offer sounds great, but I doubt wether I'll finish my sub before
Christmas. Everything is taking
10 x longer than I thought. I would be interested in it at a later date.
Can you post pictures with size when
you've finished the unit? I've gone off building an ambient after
looking into it a bit more deeply, are you
still pursueing this?
regards Alan
----- Original Message -----
Sent: Monday, May 18, 2009 4:04 PM
Subject: RE: [PSUBS-MAILIST] new
sonar
Alan,
I will chip in $80.00 and you match
this. I will build one such system that you install aboard your boat for
keeps. Then you can tell us all what you think....sound
fair?
David Bartsch
From: alanjames@xtra.co.nz
To: personal_submersibles@psubs.org
Subject:
Re: [PSUBS-MAILIST] new sonar
Date: Mon, 18 May 2009 09:12:49 +1200
Hi David,
Maybe you could sell it to the French and British navy
for thier nuclear submarines.
Two things; first if it was to avoid collision on the
surface it would need a big range to detect a fizz boat zeroing in at 30
knots (15 meters per second ). The second is, is it
any more advantageous than a depth sounder that you can pick up for
the same price ?
regards Alan
----- Original Message -----
Sent: Sunday, May 17, 2009 9:17
PM
Subject: [PSUBS-MAILIST] new
sonar
I am in the process of developing a passive sonar
that's primary purpose will be for collision avoidance.
It will
consist of a small electronic enclosure box with but a single amplification
channel contained within. A single hyper sensitive passive hydrophone that
is directional would be mounted facing forward. The output would be
monitored by either headphones or a small dedicated wall mounted
speaker.
A power isolation switch, power present indicator light,
gain and volume control level knobs will be all that will be needed to
control this simple system. This enclosure will be quite small.
Prior to surfacing, the submarine would make a complete circle so as to
determine local surface traffic conditions. Once satisfied of the level of
local activity, the submarine would proceed to a shallower depth or surface
altogether.
In that no outgoing communications will be involved in
this system hence no voice transmitter, I am looking to be able to produce
each unit for about $160.00. I would consider this a safety tool that should
aid in making surfacing a bit less hairy.
Anyone interested or
have any thoughts on this
one?
David Bartsch
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