On Wed, 2 Dec 1998, Alex Ferguson wrote: > > Caution note: in very heavy or sustained rains, you can pick up enough > > rainwater in a cockpit to collapse your rack > > I've heard that fallacy too. Over enough days maybe but > taking 6" of rain over night on a single, that's about 2" of > water in the cockpit. Remember the opening is a lot smaller > than the floor area of a standard (not folding) kayak. In browsing through the Canadian Transportation Board's marine accident reports, you frequently come across laments that the (often deceased) fishers and sailors failed to appreciate just how destabilizing the "free surface effect" of water can be. (I'm no techie, but as far as I can tell "free surface effect" is tech-talk for "sloshing".) I do remember that water weighs about 64 lbs. per cubic foot, depending on whether it's fresh or salt. Here on the Wet Coast, it's not uncommon to have to pump out your boat in the morning if you've left it out on the beach without the cockpit cover. I'm quite prepared to believe the weight and momentum of a few inches of water in the boat could damage the boat, cause it to shear through roof rack lines, and/or tip the car itself under the wrong acceleration/de acelleration/turning circumstances. And I suspect that if it did so, you could be charged with carrying an "unsafe load" in the same way truckers are liable if stuff blows or shears off their trucks. Most of us have a cockpit cover anyway and it doesn't seem like a great burden to use it when you consider the potential damage to the boat, ourselves and others. Cheers Philip T. "The opinions expressed in this posting are not necessarily those of my employer, or indeed, of any sentient being." **************************************** Mountain Equipment Co-op 1655 West 3rd Avenue, Vancouver, BC, Canada V6J 1K1 Tel: 640-732-1989 Fax: 604-731-6483 email: pid_at_mec.ca Visit our website at: http://www.mec.ca ***************************************** *************************************************************************** PaddleWise Paddling Mailing List Submissions: paddlewise_at_lists.intelenet.net Subscriptions: paddlewise-request_at_lists.intelenet.net Website: http://www.gasp-seakayak.net/paddlewise/ ***************************************************************************
ATTN: if humor doesn't "float your boat" ;-) delete now!! At 14:24 01-12-98 -0800, Philip T. wrote: [sniparoo] > I do remember that water weighs about >64 lbs. per cubic foot, depending on whether it's fresh or salt. Here on >the Wet Coast, it's not uncommon to have to pump out your boat in the >morning if you've left it out on the beach without the cockpit cover. I'm >quite prepared to believe the weight and momentum of a few inches of water >in the boat could damage the boat, cause it to shear through roof rack >lines, and/or tip the car itself under the wrong acceleration/ >deacelleration/turning circumstances. [sniparoni the paddlewise treat ;-] i read the above, and said HUH?? 8.6lbs/gallon or 1kg/liter 2.2lbs/kg so 64 pounds of water is 29 liters, slightly more than a cubic foot ;-) then i also read: >Vancouver, BC, Canada V6J 1K1 and said, oh a canadian talking about pounds and feet ;-) and now for the rest of the story, 'cause i'm not trying to shame philip... *************************************************************************** PaddleWise Paddling Mailing List Submissions: paddlewise_at_lists.intelenet.net Subscriptions: paddlewise-request_at_lists.intelenet.net Website: http://www.gasp-seakayak.net/paddlewise/ ***************************************************************************
Mark Zen wrote: > > At 14:24 01-12-98 -0800, Philip T. wrote: > > I do remember that water weighs about > >64 lbs. per cubic foot, depending on whether it's fresh or salt. > > i read the above, and said HUH?? > 8.6lbs/gallon or 1kg/liter > 2.2lbs/kg so 64 pounds of water is 29 liters, slightly more than a cubic foot ;-) > then i also read: > > >Vancouver, BC, Canada V6J 1K1 > > and said, oh a canadian talking about pounds and feet ;-) A cubic foot of fresh water is 62.4 pounds (not sure at what temperature). Salt water is heavier & I recall 64 pounds/cubic foot though it will depend on the salt concentration. Dead Sea water will be heavier than ocean water. Oh, I'm Canadian too, but educated before we modernized & adopted the metric system. -- Lloyd Bowles The Mad Canoeist "Keep the open side up!" http://www.fortunecity.com/greenfield/clearstreets/358/index.html *************************************************************************** PaddleWise Paddling Mailing List Submissions: paddlewise_at_lists.intelenet.net Subscriptions: paddlewise-request_at_lists.intelenet.net Website: http://www.gasp-seakayak.net/paddlewise/ ***************************************************************************
ATTN: if humor doesn't "float your boat" ;-) delete now!! this is a resend of the previous post, which left out the science part... At 14:24 01-12-98 -0800, Philip T. wrote: [sniparoo] > I do remember that water weighs about >64 lbs. per cubic foot, depending on whether it's fresh or salt. Here on >the Wet Coast, it's not uncommon to have to pump out your boat in the >morning if you've left it out on the beach without the cockpit cover. I'm >quite prepared to believe the weight and momentum of a few inches of water >in the boat could damage the boat, cause it to shear through roof rack >lines, and/or tip the car itself under the wrong acceleration/ >deacelleration/turning circumstances. [sniparoni the paddlewise treat ;-] i read the above, and said HUH?? 8.6lbs/gallon or 1kg/liter 2.2lbs/kg so 64 pounds of water is 29 liters, slightly more than a cubic foot ;-) then i also read: >Vancouver, BC, Canada V6J 1K1 and said, oh a canadian talking about pounds and feet ;-) and now for the rest of the story, 'cause i'm not trying to shame philip... - - - my reference book [i almost got a nose bleed climbing to the top of my bookcase] says: water at 62oF [distilled] 1 gal = 8.32675 lbs 1 cubic foot = 62.288 lbs [~7.45 gallons] = 28.3163 liters so, philip had the weight right, i got the liters, and still have a hard time thinking i can fit almost seven and a half gallons in ft^3 --- so when you hear the potomac river hit 375,000cfs, that's 2.8+MILLION gallons per second!! mark #------canoeist[at]netbox[dot]com-------------------------------------- mark zen o, o__ o_/| o_. po box 474 </ [\/ [\_| [\_\ ft. lupton, co 80621-0474 (`-/-------/----') (`----|-------\-') #~~~~~~~~~~~~~~~~~~~~~~~~~~~_at_~~~~~~~_at_~~~~~~~~~~~~~~~~~~~_at_~~~~~~~~_at_~~~~~ http://www.diac.com/~zen/paddler [index of Paddling websites I manage] Rocky Mtn Sea Kayak Club, Colorado River Flows, Poudre Paddlers The Colorado Paddlers' Resource, Rocky Mtn Canoe Club Trip Page #-Fortune: "In a world without fences, who needs 'Gates'" -- Scott McNealy, CEO Sun Microsystems "In a world without walls, who needs 'Windows'" -- Dave Livigni *************************************************************************** PaddleWise Paddling Mailing List Submissions: paddlewise_at_lists.intelenet.net Subscriptions: paddlewise-request_at_lists.intelenet.net Website: http://www.gasp-seakayak.net/paddlewise/ ***************************************************************************
This archive was generated by hypermail 2.4.0 : Thu Aug 21 2025 - 16:32:53 PDT