Bob V wrote >I have considered -- but not yet tried -- attaching a short length (1/2 >inch?) of plastic pipe or hose to the base of the pump inside the strainer >basket, effectively lowering the base of the pump. Perhaps I'll get to that >this spring (can't even get my obligatory work done, but I'll probably get >to this first). > >Meanwhile, I'm not really unhappy with the volume of water that is left by >the pump as is. After all, the pump is meant to restore stability, which it >does. The 3/4 inch or so of water that the pump can't remove doesn't seem >to be much of a problem for stability. > Steve wrote: >Why would it be important to? 1.5 cm of water isn't much. You'll drip >that much off your clothing when you reenter the boat. When I paddle >white water canoe, there is routinely an inch or two (2.5-5 cm) of water >in the bottom of the boat. When it gets to be over 4 inches (10 cm) I >start to think about bailing. > Peter Rattenbury replies: I agree, of course this level of water is not really a safety issue in a hardshell with watertight bulkheads, nor is it an issue in a Klepper in calm or even moderate seas. My concern is not getting wet,! but the weight of say just half an inch of water sloshing around in a high volume kayak like the Klepper in ROUGH seas. Even with fitted air bags in the bow and stern sections. I am talking about this sort of weight of water sloshing bow to stern and back again in an open ocean situation with a swell of two to three metres under a sea of say one to two metres. I had not given this sloshing/weight effect much thought, but typically in a capsize at sea, either in practice or for real, I have ended up back in the boat after a pump-out with at least this quantity of water trapped, but mainly hidden by the keelboards. One does not realise the weight or the dynamics of the water unencumbered by bulkheads until you do the same exercise on land. Fill a seventeen foot boat with half an inch of water, have a friend take one end , lift and tip the boat fore and aft and you will be suprised at the destabilising effect of the water rushing back and forth! It is a tribute to the inherent stability of the Klepper that this weight shift is not really noticeable on the water. And I realise that you can paddle a Klepper fully flooded, due to the stabilising effect of the sponsons. BTW, this reminds me of a vehicle ferry tragedy in the English Channel, back in '88 I think. A large fully loaded ferry put out from a French port for England, but the bow doors were not locked down properly. As the ferry gathered speed water began flowing unnoticed in and across the vehicle deck, which of course ran the length of the vessel. Eventually the weight of the water, and the sloshing effect combined to capsize this vessel of several thousand tonnes, at the cost of many lives. But thanks Bob for the suggestion of extending the base of the pump. Good idea, I will give it a go. I have been in touch with a large pump distributor chasing a better scavenger pump, but it seems the Rule is the best on offer. Regards, PJ *************************************************************************** PaddleWise Paddling Mailing List - All postings copyright the author and not to be reproduced outside PaddleWise without author's permission Submissions: paddlewise_at_lists.intelenet.net Subscriptions: paddlewise-request_at_lists.intelenet.net Website: http://www.paddlewise.net/ ***************************************************************************
Seems to me I recall that someone wrote about placing flotation materials or other stuff in out-of-the-way places on the cockpit floor to act as baffles to minimize the sloshing effect you describe. It might be worth while trying both approaches (lowered pump opening and baffles). Let us know how it turns out! Bob From: PJ Rattenbury <ratten_at_uow.edu.au> Date: Tuesday, February 01, 2000 5:36 PM >My concern is not getting wet,! but the >weight of say just half an inch of water sloshing around in a high volume >kayak like the Klepper in ROUGH seas. Even with fitted air bags in the bow >and stern sections. I am talking about this sort of weight of water >sloshing bow to stern and back again in an open ocean situation <snip> *************************************************************************** PaddleWise Paddling Mailing List - All postings copyright the author and not to be reproduced outside PaddleWise without author's permission Submissions: paddlewise_at_lists.intelenet.net Subscriptions: paddlewise-request_at_lists.intelenet.net Website: http://www.paddlewise.net/ ***************************************************************************
That was me who wrote about that. As per Matt's suggestion, I have acquired a sea sock. That might be sufficient. I'll give a report on my impressions. Might be a couple of weeks. Robert > From: Bob Volin <bobvolin_at_bestweb.net> > Date: Tue, 01 Feb 2000 21:49:42 -0500 > To: Paddlewise <paddlewise_at_lists.intelenet.net> > Subject: Re: [Paddlewise] Electric Pumps > > Seems to me I recall that someone wrote about placing flotation materials or > other stuff in out-of-the-way places on the cockpit floor to act as baffles > to minimize the sloshing effect you describe. It might be worth while > trying both approaches (lowered pump opening and baffles). Let us know how > it turns out! > Bob *************************************************************************** PaddleWise Paddling Mailing List - All postings copyright the author and not to be reproduced outside PaddleWise without author's permission Submissions: paddlewise_at_lists.intelenet.net Subscriptions: paddlewise-request_at_lists.intelenet.net Website: http://www.paddlewise.net/ ***************************************************************************
Adding to last night's post, here's a picture and a little info from Mirage kayaks: http://www.mirageseakayaks.com.au/features.html click on "electric pump" to see a Rule 500 gph, fitted behind seat, waterproof switch in a recessed deck depression, and battery in the day hatch compartment. Here's Peter Carter's page re pumps, obviously recently updated with commentary about the Tasmanian circumnavigation write-up in Aug 2003 SeaKayaker: http://users.senet.com.au/~pcarter/pumps.html And here's a point of view on pumps: http://www.nswseakayaker.asn.au/mag/35/pumps2.html Cheers, PT *************************************************************************** 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/ ***************************************************************************
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