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RE: [PSUBS-MAILIST] new sonar

Alan,
 
  Collision avoidance sonars are not fool proof against accidents. If used as designed, these provide but another tool to help keep mishaps to a minimum.
 
  I am trying to drum up support for a "show and tell" system that can be installed aboard boats attending this coming convention in October.( Although gainfully employed, my job at the Postal Service has seen a reduction in "extra" hours I had become accustomed to enjoy. My hobby budget must be likewise adjusted)
  The sensor for use at the convention will be suction cup installed on the inside of a viewport such as was done aboard Kraka. (The permanent install hydrophone will be substituted for demonstration purposes) It may be raffled off as a door prize?
  The newest hydrophone contains no resonance chamber and seems far more sensitive to incoming sound.
  It will be a system that once turned on will require no operator intervention until the boat is back at the dock. The speaker will be mounted using the interior magnet as the submarine is made from steel. (just "stick" it some place out of the way!)
  This is a great chance for someone to acquire the best I have to offer. Schematics and parts lists will be available to those "do it yourselfers." I will cover half of the construction costs on this unit just to see it given serious thought. It will allow at least one person a basic passive sonar capability.
  There is still some time to go before this meet and I will try my best to complete this system in time.
 
  I am going ambient for (1) cost
                                 (2) simplicity
                                 (3) ease of escape
                                        and
                                 (4) the lack of any nearby deep water
 
                                                                                                   David Bartsch
  
 
From: alanjames@xtra.co.nz
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] new sonar
Date: Mon, 18 May 2009 19:36:56 +1200

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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