On Wed, 15 May 2002, Michael Daly wrote: <snip> > Otherwise, you'll be re-breathing the same air in the tube as it > gradually increases its carbon dioxide content. One alternative is to > exhale through your nose and not back into the hose, but that means > draining the air in the kayak if the tube is inside the skirt. Or, just install a couple of one-way valves, sometimes called a "flapper" valve, that isn't much more than a stiff rubber plate that deflects when you draw a breath and allows fresh air into the mouthpiece but seats against a stop when you exhale. You might need a second one in the exhale path to keep sea water from entering during the drawing of a breath. I think that high-end snorkels already have an arrangement kinda like this. Cheers, Matt *************************************************************************** PaddleWise Paddling Mailing List - Any opinions or suggestions expressed here are solely those of the writer(s). You must assume the entire responsibility for reliance upon them. All postings copyright the author. Submissions: PaddleWise_at_PaddleWise.net Subscriptions: PaddleWise-request_at_PaddleWise.net Website: http://www.paddlewise.net/ ***************************************************************************Received on Wed May 15 2002 - 20:07:59 PDT
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