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This is a multi-part message in MIME format. ------=_NextPart_000_0074_01C09566.14DB40D0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Don, You reversed the conversion. Divide not multiply... TT ----- Original Message ----- From: Don Burke To: techdiver@aquanaut.com ; Matthias Voss Sent: Tuesday, February 13, 2001 12:21 PM Subject: Re: heated watersuit From: Matthias Voss <mat.voss@t-*.de*> > The price for one suit was 500,- DM, for the other 800,-DM , I believe. That's about $1050/$1680USD. Yikes! > > The pack connects to the suit, has a temperature control, and is available > > with several mounting options. > > How it does that without punching a hole in the drysuit or making a seal > > into a leak is a mystery to me. > > They do not a through connection to inside the suit ? > I have seen wireless transmission with charging devices, but in this > application I would chose to make a neat connection to the suit. The company says "no modification to the drysuit." They may use Voodoo and provide you with a bag of chicken bones for field use. I've seen SONAR systems that worked that way. :) The wireless charging I have seen is done by sending an AC magnetic field through the case. It isn't all that efficient, but one avoided case of flooding a housing can pay for quite a bit of power loss. I think I would go for a through-suit connection too. It would be much easier to manage in an entanglement. > > > There was also a suit who's designer claimed a capability of chemically > > > storing latent enrgy and rendering heat in the very moment the > > > temperature dropped below a trigger point. You may have seen this very > > > design with cars, where the cooling system serves to heat > > > natriumsomething crystals, which in turn give this energy back on > > > demand. > > > > If you could have a material with a melting point around 90 degrees and > > enough specific heat, you could wear a vest of the stuff under your drysuit > > and go the first part of the dive on sensible heat and the rest of the dive > > on the latent heat given off as the material solidifies. I know of no > > material with a high enough specific heat to do that. > > That was exactly how they said it would work. The crystals were said to > be "woven in " within the fabric. I would expect it to require quite a bit more mass than one could get into a fabric. Since I don't have one, I'll assume it didn't work out very well. :) > > The thing about this rig that got my attention was that the suits put no > > heat on the head, hands, or feet. The heating element is at the spine. > > May be there is good reason for this. If you feel the cold, your body > can react to it and economize. > The spine is susceptible to cold, without the need to feel it there, > _because_ you already feel it at your more exposed limbs. > People die in the water when temperatures at the upper spine ( > especially C1 to C ** drop below a certain level, which in turn affects > motion and breathing. > So heating the spine may be beneficial, and economic. Makes sense. My knowledge of physiology is pretty limited. > The company was Robin Hood Watersports ( ROHO)from UK. At those prices, they go to the bottom of my "to-do" list. :) Don Shop online without a credit card http://www.rocketcash.com RocketCash, a NetZero subsidiary -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'. ------=_NextPart_000_0074_01C09566.14DB40D0 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 5.50.4611.1300" name=3DGENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=3D#ffffff> <DIV><FONT face=3DArial size=3D2>Don,</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>You reversed the conversion. Divide not = multiply...</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>TT</FONT></DIV> <BLOCKQUOTE=20 style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; = BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px"> <DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV> <DIV=20 style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: = black"><B>From:</B>=20 <A title=3Ddonburke56@ne*.ne* = href=3D"mailto:donburke56@ne*.ne*">Don=20 Burke</A> </DIV> <DIV style=3D"FONT: 10pt arial"><B>To:</B> <A = title=3Dtechdiver@aquanaut.com=20 href=3D"mailto:techdiver@aquanaut.com">techdiver@aquanaut.com</A> ; <A = title=3Dmat.voss@t-*.de* = href=3D"mailto:mat.voss@t-*.de*">Matthias=20 Voss</A> </DIV> <DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Tuesday, February 13, = 2001 12:21=20 PM</DIV> <DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Re: heated = watersuit</DIV> <DIV><BR></DIV>From: Matthias Voss <<A=20 = href=3D"mailto:mat.voss@t-*.de*">mat.voss@t-online.de</A>><BR><BR>= > =20 The price for one suit was 500,- DM, for the other 800,-DM , I=20 believe.<BR><BR>That's about $1050/$1680USD. Yikes!<BR><BR>> = > The=20 pack connects to the suit, has a temperature control, and=20 is<BR>available<BR>> > with several mounting options.<BR>> = > How=20 it does that without punching a hole in the drysuit or making a = seal<BR>>=20 > into a leak is a mystery to me.<BR>><BR>> They do not a = through=20 connection to inside the suit ?<BR>> I have seen wireless = transmission with=20 charging devices, but in this<BR>> application I would chose to = make a neat=20 connection to the suit.<BR><BR>The company says "no modification to = the=20 drysuit."<BR>They may use Voodoo and provide you with a bag of chicken = bones=20 for field<BR>use.<BR>I've seen SONAR systems that worked that = way. =20 :)<BR><BR>The wireless charging I have seen is done by sending an AC = magnetic=20 field<BR>through the case. It isn't all that efficient, but one = avoided=20 case of<BR>flooding a housing can pay for quite a bit of power = loss.<BR><BR>I=20 think I would go for a through-suit connection too.<BR>It would be = much easier=20 to manage in an entanglement.<BR><BR>> > > There was also a = suit=20 who's designer claimed a capability of<BR>chemically<BR>> > > = storing=20 latent enrgy and rendering heat in the very moment the<BR>> > = >=20 temperature dropped below a trigger point. You may have seen this = very<BR>>=20 > > design with cars, where the cooling system serves to = heat<BR>>=20 > > natriumsomething crystals, which in turn give this energy = back=20 on<BR>> > > demand.<BR>> ><BR>> > If you could = have a=20 material with a melting point around 90 degrees and<BR>> > = enough=20 specific heat, you could wear a vest of the stuff under=20 your<BR>drysuit<BR>> > and go the first part of the dive on = sensible=20 heat and the rest of the<BR>dive<BR>> > on the latent heat given = off as=20 the material solidifies. I know of no<BR>> > material with = a high=20 enough specific heat to do that.<BR>><BR>> That was exactly how = they=20 said it would work. The crystals were said to<BR>> be "woven in " = within=20 the fabric.<BR><BR>I would expect it to require quite a bit more mass = than one=20 could get into a<BR>fabric.<BR>Since I don't have one, I'll assume it = didn't=20 work out very well. :)<BR><BR>> > The thing about this rig that = got my=20 attention was that the suits put no<BR>> > heat on the head, = hands, or=20 feet. The heating element is at the spine.<BR>><BR>> May = be there=20 is good reason for this. If you feel the cold, your body<BR>> can = react to=20 it and economize.<BR>> The spine is susceptible to cold, without = the need=20 to feel it there,<BR>> _because_ you already feel it at your more = exposed=20 limbs.<BR>> People die in the water when temperatures at the = upper=20 spine (<BR>> especially C1 to C ** drop below a certain level, = which in=20 turn affects<BR>> motion and breathing.<BR>> So heating the = spine may be=20 beneficial, and economic.<BR><BR>Makes sense. My knowledge of = physiology=20 is pretty limited.<BR><BR>> The company was Robin Hood Watersports = (=20 ROHO)from UK.<BR><BR>At those prices, they go to the bottom of my = "to-do"=20 list. :)<BR><BR>Don<BR><BR><BR>Shop online without a credit = card<BR><A=20 = href=3D"http://www.rocketcash.com">http://www.rocketcash.com</A><BR>Rocke= tCash,=20 a NetZero subsidiary<BR>--<BR>Send mail for the `techdiver' mailing = list to <A=20 = href=3D"mailto:`techdiver@aquanaut.com'">`techdiver@aquanaut.com'</A>.<BR= >Send=20 subscribe/unsubscribe requests to <A=20 = href=3D"mailto:`techdiver-request@aquanaut.com'">`techdiver-request@aquan= aut.com'</A>.<BR></BLOCKQUOTE></BODY></HTML> ------=_NextPart_000_0074_01C09566.14DB40D0-- -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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