>But what about that second two mil vest and shorts over the longjohn. ...etc. You seem to be assuming so much effectiveness for the first layer of insulation that the second layer has nothing to insulate -- sort of like the situation you would have if you wrapped a blanket around a very well-made thermos bottle. We don't do the latter because the gain in heat retention would be negligible (relatively little heat leaks from the bottle) and the coffee wouldn't be noticeably hotter or stay that way much longer than without the blanket. The same logic could be used to "prove" that layering winter clothing isn't helpful. Part of the value of layering (in general) is that it offers the option of tailoring your level of insulation to the conditions (by adding or removing layers), thus avoiding overheating. That's probably not a consideration when immersed in cold water. A human body wrapped in any kind of clothing probably does NOT approximate a thermos bottle. There will be significant heat loss through a first thin layer of neoprene, else why would thicker neoprene insulate better? Whether 'tis better to make it thicker buy buying it thicker in the first place or by adding a second thin layer would seem to be an empirical question, i.e., begging for someone to go out and measure the difference with a thermometer. Hope that early morning rambling adds to the discussion... Ira Adams ************************************************************ I don't do .INI, .BAT, .CFG, or .SYS files. I don't assign apps to files. I don't configure peripherals or networks before using them. I don't manage IRQs and DMA channels, either. My computer works for me, not the other way around. I have a Macintosh. *************************************************************************** PaddleWise Paddling Mailing List Submissions: paddlewise_at_lists.intelenet.net Subscriptions: paddlewise-request_at_lists.intelenet.net Website: http://www.gasp-seakayak.net/paddlewise/ ***************************************************************************Received on Thu Oct 29 1998 - 04:50:29 PST
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