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Don, The rpice for one suit was 500,- DM, for the other 800,-DM , I believe. Don Burke schrieb: > That is pretty much the way this thing works. The suit looks like a > diveskin and is made of fleeced PolyPro/Lycra and nylon coated neoprene and > has a heating element in the spine. I get the impression that it is very > thin, which in the case of neoprene translates to very expensive. The > battery pack is six volts and weighs about three pounds. The website had a > capacity for it which I don't recall. > > 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. > > > 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. > 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. The company was Robin Hood Watersports ( ROHO)from UK. best Matthias -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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