> "Whyte, David" wrote: > > The problem with using them on a kayak is you need to be moving > > very fast for them to work. Even on my sailing boats they required a > > reasonable speed (much faster than a paddler) before they would start > > draining the water out. ........ "Brian Nystrom" replyed > Sit on top kayaks often use them in the seat. However, they have buoyant hulls > with large trapped air spaces for floatation and no real cockpit. I don't know > how well they would work on a closed kayak with a flooded cockpit. I played many times with the idea but never had time to try it. A completely flooded kayak is absolutely unstable, but with practice can be paddled. The excess of weight will dramatically increment the inertia, demanding more time and effort to reach enought speed. But a cruising speed of 3 or 4 knots should work fine ( 4 knots is a regular speed for small vessels ). As Brian says the ventury efect is produced by the water flowing under the kayak ( yeah, aparent movement, as it is the kayak which is moving, not the water ). But here comes the probem. I use neoprenne spraysquirts, and once wetted enough they seal so well that they are not only "water-proof" but "air-prooff". This means that while the ventury will start bailing the flooded kayak, if the squirt is on a vacuum effect will tend to cancel it. So, to let it work you must paddle with the squirt off (at least partially ) or supply a way for the air to get into the cockpit, what leaves you vulnerable to the waves or storm that forced you to capsize with more water trying to get it. As we say in spanish, this is a "circulo vicioso", (literal translation is "vicious circle", I hope you get the meaning). Maybe a plug on the deck will work, letting enough air get in, and talking about carburators, they have an air duct with an easy to copy water-trap to avoid any water to get in. Itīs only a matter to play with the sizes ..... It will work .... Fernando Lopez Arbarello Kayak Argentina - Sea Kayaking Mailing List www.topica.com/lists/kayak_argentina kayak_argentina_at_uol.com.ar *************************************************************************** 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 Tue Mar 20 2001 - 21:49:25 PST
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