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This is a multi-part message in MIME format. ------=_NextPart_000_001C_01C0622E.94B0B440 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Hi Bob, Question is, what will the buoyancy characteristics be like? I have worked out that a pair of these cylinders will be POSITIVELY buoyant by about 4.2kg when EMPTY and NEGATIVELY buoyant by about 2.2kg when FULL. If this is correct it means a great deal of lead will need to be carried on the weight belt to compensate for the positive buoyancy when empty (no backplate). I think about 3.5kg positive if you just look at the cylinders. Don't forget the regs, bands and manifold. What do you mean with "no back plate". Are we talking about the fact that you don't use a back plate? Not recommended. Personally I don't use ANY lead/weight with this setup, just my Pro 6 canister (warm water-3mm wetsuit) Does anybody know the exact weight/volume and dimensions of these cylinders? I think they are generally referred to as an "Aluminium 80". If they are BS5045:Part 3 cylinders they should have a diameter of 204mm and a weight of 16.48kg. Alu80 means 80cft at 3000psi but the real volume will be somewhere around 10.5L Has anybody got any information or had experience of diving doubles in the Red Sea? Yes, I have got some experience in warm water with a 3mm wetsuit and double 80's Best Regards, TT ------=_NextPart_000_001C_01C0622E.94B0B440 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=3DContent-Type content=3D"text/html; = charset=3Diso-8859-1"> <META content=3D"MSHTML 5.50.4207.2601" name=3DGENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=3D#ffffff> <DIV><SPAN class=3D560250803-10122000><FONT face=3DArial color=3D#0000ff = size=3D2>Hi=20 Bob,</FONT></SPAN></DIV> <BLOCKQUOTE dir=3Dltr=20 style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #0000ff 2px = solid; MARGIN-RIGHT: 0px"> <DIV> <DIV><FONT face=3DArial size=3D2>Question is, what will the buoyancy=20 characteristics be like?</FONT></DIV> <DIV><FONT face=3DArial color=3D#0000ff size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>I have worked out that a pair of = these cylinders=20 will be POSITIVELY buoyant by about 4.2kg when EMPTY and NEGATIVELY = buoyant by=20 about 2.2kg when FULL. If this is correct it means a great deal = of lead=20 will need to be carried on the weight belt to compensate for the = positive=20 buoyancy when empty (no backplate).</FONT></DIV> <DIV><FONT face=3DArial color=3D#0000ff size=3D2></FONT> </DIV> <DIV><SPAN class=3D560250803-10122000><FONT face=3DArial = color=3D#0000ff size=3D2>I=20 think about 3.5kg positive if you just look at the=20 cylinders.</FONT></SPAN></DIV> <DIV><SPAN class=3D560250803-10122000><FONT face=3DArial = color=3D#0000ff=20 size=3D2>Don't forget the regs, bands and manifold. What do you mean = with "no=20 back plate".</FONT></SPAN></DIV> <DIV><SPAN class=3D560250803-10122000><FONT face=3DArial = color=3D#0000ff size=3D2>Are=20 we talking about the fact that you don't use a back = plate? Not=20 recommended.</FONT></SPAN></DIV> <DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20 class=3D560250803-10122000>Personally I don't use ANY lead/weight with = this=20 setup, just my Pro 6 canister (warm water-3mm = wetsuit)</SPAN></FONT></DIV> <DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20 class=3D560250803-10122000></SPAN></FONT><FONT face=3DArial = color=3D#0000ff=20 size=3D2><SPAN class=3D560250803-10122000></SPAN></FONT><FONT = face=3DArial=20 color=3D#0000ff size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>Does anybody know the exact = weight/volume and=20 dimensions of these cylinders? I think they are generally = referred to as=20 an "Aluminium 80". If they are BS5045:Part 3 cylinders they = should have=20 a diameter of 204mm and a weight of 16.48kg.</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><SPAN class=3D560250803-10122000><FONT face=3DArial = color=3D#0000ff=20 size=3D2>Alu80 means 80cft at 3000psi but the real volume will be = somewhere=20 around 10.5L</FONT></SPAN></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>Has anybody got any information or = had experience=20 of diving doubles in the Red Sea?</FONT></DIV> <DIV><FONT face=3DArial color=3D#0000ff size=3D2></FONT> </DIV> <DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN = class=3D560250803-10122000>Yes,=20 I have got some experience in warm water with a 3mm wetsuit and double = 80's</SPAN></FONT></DIV> <DIV><FONT face=3DArial color=3D#000000 size=3D2><SPAN=20 class=3D560250803-10122000></SPAN></FONT> </DIV> <DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN = class=3D560250803-10122000>Best=20 Regards,</SPAN></FONT></DIV> <DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20 class=3D560250803-10122000></SPAN></FONT> </DIV> <DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20 = class=3D560250803-10122000>TT</SPAN></FONT></DIV></DIV></BLOCKQUO TE></BOD= Y></HTML> ------=_NextPart_000_001C_01C0622E.94B0B440-- -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. 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