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This message is in MIME format. Since your mail reader does not understand this format, some or all of this message may not be legible. ------_=_NextPart_001_01C23E85.D63364A0 Content-Type: text/plain; charset="iso-8859-1" I found that most deco stops like this end up floating at a 45 degree angle if there is any current. This means that half your deco stop points become useless because they are too shallow. The best systems I've seen in Australia use a heavy, weighted chain hanging vertically from a buoy. You simply swim up to the chain, attach a jon line to one of the links, drift back and hang on to the other end. This allows several divers to be clipped in around the same spot without bumping into each other too much. It also means that in a big swell, the diver does not get his arm yanked up and down by holding on to a horizontal bar. Hope this helps James Dibbs Sydney, Australia -----Original Message----- From: Cameron Fraser [mailto:cameron.fraser@ns*.sy*.ca*] Sent: Thursday, 8 August 2002 10:42 AM To: techdiver@aquanaut.com Subject: Deco Station design assistance Any insight/plans/photos/design info for a deco station would be greatly appreciated. I am looking to advance along the learning curve of the list, being in a far northern climate, it could ice up here any day and the season would be cut short ;-), thus reducing the ability to test dive/hang the device. For background: Location is North Atlantic, Nova Scotia Currents are sometimes an issue, mainly ebb and flow of tides Presently the other individuals that have exerted themselves to create a station have dropped 10 feet of 3 inch diameter tube from the side of the vessel. It works, however the user requires an engineered jon line constructed from a bungee jump line! Present thoughts are to hang vertical lines from balloons (AKA big orange commercial grade floats). At the various stop depths there would be be a cross section of line spiced in and a galvanized square tube or other rigid section (? electrical conduit) inserted to hold the spread of the station. The conduit comes in 10 foot lengths -> the spread would probably end up in the 10 foot range. This would be repeated at various levels, i.e. 20, 30 and maybe as far as 40. Taking into account the operating procedure of the dive vessel, the device would remain tethered to the vessel (tether attaching the vessel to a balloon); the tether being the dynamic linkage, allowing for the 'normal' 4+ feet of wave action. Pictures will be provided of the end product for the benefit of all who assist/are interested. ------_=_NextPart_001_01C23E85.D63364A0 Content-Type: text/html; charset="iso-8859-1" <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1"> <META content="MSHTML 5.50.4727.700" name=GENERATOR></HEAD> <BODY> <DIV><SPAN class=412213702-08082002><FONT face=Arial color=#0000ff size=2>I found that most deco stops like this end up floating at a 45 degree angle if there is any current. This means that half your deco stop points become useless because they are too shallow.</FONT></SPAN></DIV> <DIV><SPAN class=412213702-08082002><FONT face=Arial color=#0000ff size=2></FONT></SPAN> </DIV> <DIV><SPAN class=412213702-08082002><FONT face=Arial color=#0000ff size=2>The best systems I've seen in Australia use a heavy, weighted chain hanging vertically from a buoy. You simply swim up to the chain, attach a jon line to one of the links, drift back and hang on to the other end. </FONT></SPAN></DIV> <DIV><SPAN class=412213702-08082002><FONT face=Arial color=#0000ff size=2></FONT></SPAN> </DIV> <DIV><SPAN class=412213702-08082002><FONT face=Arial color=#0000ff size=2>This allows several divers to be clipped in around the same spot without bumping into each other too much. </FONT></SPAN></DIV> <DIV><SPAN class=412213702-08082002><FONT face=Arial color=#0000ff size=2></FONT></SPAN> </DIV> <DIV><SPAN class=412213702-08082002><FONT face=Arial color=#0000ff size=2>It also means that in a big swell, the diver does not get his arm yanked up and down by holding on to a horizontal bar.</FONT></SPAN></DIV> <DIV><SPAN class=412213702-08082002><FONT face=Arial color=#0000ff size=2></FONT></SPAN> </DIV> <DIV><SPAN class=412213702-08082002><FONT face=Arial color=#0000ff size=2>Hope this helps</FONT></SPAN></DIV> <DIV><SPAN class=412213702-08082002><FONT face=Arial color=#0000ff size=2></FONT></SPAN> </DIV> <DIV><SPAN class=412213702-08082002><FONT face=Arial color=#0000ff size=2>James Dibbs</FONT></SPAN></DIV> <DIV><SPAN class=412213702-08082002><FONT face=Arial color=#0000ff size=2>Sydney, Australia</FONT></SPAN></DIV> <BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px"> <DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma size=2>-----Original Message-----<BR><B>From:</B> Cameron Fraser [mailto:cameron.fraser@ns*.sy*.ca*]<BR><B>Sent:</B> Thursday, 8 August 2002 10:42 AM<BR><B>To:</B> techdiver@aquanaut.com<BR><B>Subject:</B> Deco Station design assistance<BR><BR></FONT></DIV> <DIV><SPAN class=470191900-08082002><FONT face=Arial size=2>Any insight/plans/photos/design info for a deco station would be greatly appreciated. I am looking to advance along the learning curve of the list, being in a far northern climate, it could ice up here any day and the season would be cut short ;-), thus reducing the ability to test dive/hang the device.</FONT></SPAN></DIV> <DIV><SPAN class=470191900-08082002><FONT face=Arial size=2></FONT></SPAN> </DIV> <DIV><SPAN class=470191900-08082002><FONT face=Arial size=2>For background:</FONT></SPAN></DIV> <DIV><SPAN class=470191900-08082002><FONT face=Arial size=2>Location is North Atlantic, Nova Scotia</FONT></SPAN></DIV> <DIV><SPAN class=470191900-08082002><FONT face=Arial size=2>Currents are sometimes an issue, mainly ebb and flow of tides</FONT></SPAN></DIV> <DIV><SPAN class=470191900-08082002><FONT face=Arial size=2>Presently the other individuals that have exerted themselves to create a station have dropped 10 feet of 3 inch diameter tube from the side of the vessel. It works, however the user requires an engineered jon line constructed from a bungee jump line!</FONT></SPAN></DIV> <DIV><SPAN class=470191900-08082002><FONT face=Arial size=2></FONT></SPAN> </DIV> <DIV><SPAN class=470191900-08082002><FONT face=Arial size=2></FONT></SPAN> </DIV> <DIV><SPAN class=470191900-08082002><FONT face=Arial size=2>Present thoughts are to hang vertical lines from balloons (AKA big orange commercial grade floats). At the various stop depths there would be be a cross section of line spiced in and a galvanized square tube or other rigid section (? electrical conduit) inserted to hold the spread of the station. The conduit comes in 10 foot lengths -> the spread would probably end up in the 10 foot range. This would be repeated at various levels, i.e. 20, 30 and maybe as far as 40.</FONT></SPAN></DIV> <DIV><SPAN class=470191900-08082002><FONT face=Arial size=2>Taking into account the operating procedure of the dive vessel, the device would remain tethered to the vessel (tether attaching the vessel to a balloon); the tether being the dynamic linkage, allowing for the 'normal' 4+ feet of wave action.</FONT></SPAN></DIV> <DIV><SPAN class=470191900-08082002><FONT face=Arial size=2></FONT></SPAN> </DIV> <DIV><SPAN class=470191900-08082002><FONT face=Arial size=2>Pictures will be provided of the end product for the benefit of all who assist/are interested.</FONT></SPAN></DIV></BLOCKQUOTE></BODY></HTML> ------_=_NextPart_001_01C23E85.D63364A0-- -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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