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This is a multi-part message in MIME format. ------=_NextPart_000_0011_01BF2CFA.EECCAB60 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable List, After talking with some of the RB nuts, I was asking them to explain why = they use trimix for diluent, instead of simple heliox.=20 The answer was to help reduce the "helium willies" or a nervous feeling = believed to be caused by lack of any nitrogen at all in the breathing = mix. Apparently, we are all a little narked at 1 atm, and that level of = narcosis is what we are used to operating under. Talking to the boss, who spent many hours in chambers living in heliox = atmosphere's, he said: "You always had the feeling that something was wrong, or was going to go = wrong, that you had no business being here, and that your body wasn't = ever meant to be under this kind of pressure, which is all true! We = would have really weird dreams while sleeping, and your mind would just = run away with different idea's and thoughts." We watched Andrew G's presentation on the GUE trip to the Britannic last = week. Thanks for sharing Andrew! (he had to holler over an NFL game in = the next room). He stated that the bottom mix for this dive was 10/70.=20 Was the nitrogen allowed in the mix to attenuate "helium willies" or to = help with deco, or some other reason I am not yet hip to?=20 The Navy uses air or heliox, no trimix what so ever. Why the double = standard? I know from running different dives on tables and on ZPlan, that deco = can be drastically reduced by using trimix vs. heliox for most dives of = less than 2 hours duration. So, what's the deal? Why does helium, which is a smaller, lighter and = "friendlier" molecule cause increased deco obligations on shorter than = two hour dives? Scott ------=_NextPart_000_0011_01BF2CFA.EECCAB60 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 content=3D"text/html; charset=3Diso-8859-1" = http-equiv=3DContent-Type> <META content=3D"MSHTML 5.00.2314.1000" name=3DGENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=3D#ffffff> <DIV><FONT face=3DArial size=3D2>List,</FONT></DIV> <DIV> </DIV> <DIV><FONT face=3DArial size=3D2>After talking with some of the RB nuts, = I was=20 asking them to explain why they use trimix for diluent, instead of = simple=20 heliox. </FONT></DIV> <DIV><FONT face=3DArial size=3D2>The answer was to help reduce the = "helium willies"=20 or a nervous feeling believed to be caused by lack of any nitrogen at = all in the=20 breathing mix. Apparently, we are all a little narked at 1 atm, and that = level=20 of narcosis is what we are used to operating under.</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>Talking to the boss, who spent many = hours in=20 chambers living in heliox atmosphere's, he said:</FONT></DIV> <DIV> </DIV> <DIV><FONT face=3DArial size=3D2>"You always had the feeling that = something was=20 wrong, or was going to go wrong, that you had no business being here, = and that=20 your body wasn't ever meant to be under this kind of pressure, which is = all=20 true! We would have really weird dreams while sleeping, and your mind = would just=20 run away with different idea's and thoughts."</FONT></DIV> <DIV> </DIV> <DIV><FONT face=3DArial size=3D2>We watched Andrew G's presentation on = the GUE trip=20 to the Britannic last week. Thanks for sharing Andrew! (he had to holler = over an=20 NFL game in the next room). He stated that the bottom mix for this dive = was=20 10/70. </FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>Was the nitrogen allowed in the mix to = attenuate=20 "helium willies" or to help with deco, or some other reason I am not yet = hip to?=20 </FONT></DIV> <DIV> </DIV> <DIV><FONT face=3DArial size=3D2>The Navy uses air or heliox, no trimix = what so=20 ever. Why the double standard?</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>I know from running different dives on = tables and=20 on ZPlan, that deco can be drastically reduced by using trimix vs. = heliox for=20 most dives of less than 2 hours duration.</FONT></DIV> <DIV> </DIV> <DIV><FONT face=3DArial size=3D2>So, what's the deal? Why does helium, = which is a=20 smaller, lighter and "friendlier" molecule cause increased deco = obligations on=20 shorter than two hour dives?</FONT></DIV> <DIV> </DIV> <DIV><FONT face=3DArial size=3D2>Scott</FONT></DIV></BODY></HTML> ------=_NextPart_000_0011_01BF2CFA.EECCAB60-- -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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