| hulls gaining weight? #71089 04/03/06 02:23 AM 04/03/06 02:23 AM |
Joined: Mar 2006 Posts: 14 Saipan catmech OP
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Posts: 14 Saipan | I have been told by a few local sailors that the hulls of Prindles and Hobies gain weight with age? meaning they absorb water. is this a true fact? and if its true can the hulls be dried out?? thanks, Darrell
my wife is a princess therefore I must be a prince
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[Re: fin.]
#71091 04/03/06 05:49 AM 04/03/06 05:49 AM |
Joined: Jun 2001 Posts: 9,582 North-West Europe Wouter
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Posts: 9,582 North-West Europe | Drying is possible. Repair guys have to do that before making glass repairs as well. I think this is because the resin are hydrofobic. Just store the hulls in a dry (warm) place for a few weeks. With good ventilation and all inspection ports open
Wouter
Wouter Hijink Formula 16 NED 243 (one-off; homebuild) The Netherlands
| | | Re: hulls gaining weight?
[Re: catmech]
#71093 04/03/06 09:12 AM 04/03/06 09:12 AM |
Joined: Jun 2001 Posts: 12,310 South Carolina Jake
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Posts: 12,310 South Carolina | Most PVC foam cores used in today's cat construction do not absorb water. However, polyester and vinylester resins are not completely water proof and will absorb some water. Yes, they can be dried out - warm heat and low humidity for a lengthy period will do it. Epoxy resins are more resistant to water absorbtion but they are not perfect either. There are some additives availalbe for epoxy resin that help it have additional water resistance. Most barrier coats used on monohulls that remain emersed in water full time use and epoxy resin base.
Most water absorption happens when the hulls are immersed in water for very long periods. Unless you leave your hulls with lots of water in them constantly, or leave your boat on a mooring with no barrier coat on the submerged portions, you generally have little to worry about.
Jake Kohl | | | Re: hulls gaining weight?
[Re: catmech]
#71094 04/03/06 10:56 AM 04/03/06 10:56 AM |
Joined: Sep 2005 Posts: 1,187 38.912, -95.37 _flatlander_
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Posts: 1,187 38.912, -95.37 | I have been told by a few local sailors that the hulls of Prindles and Hobies gain weight with age? meaning they absorb water. is this a true fact? and if its true can the hulls be dried out?? thanks, Darrell Were they trying to sell you a new, or newer, boat? If you have doubts weigh your boat. Our '93 H20 weighs right at minimum weight.
John H16, H14
| | | Re: hulls gaining weight?
[Re: Dan_Delave]
#71097 04/04/06 02:14 AM 04/04/06 02:14 AM |
Joined: Nov 2002 Posts: 5,558 Key Largo, FL & Put-in-Bay, OH... Mary
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Posts: 5,558 Key Largo, FL & Put-in-Bay, OH... | In the case of fiberglass boats, does most of the water absorption happen as a result of water inside the hull or exposure to water on the exterior of the hulls? I assume that it is more from water on the interior, where the fiberglass is not finished. But I have heard that even gelcoat does not prevent fiberglass from absorbing water.
Also, does anybody know how much weight a wood boat would gain when stored in the water? Traditional wood monohulls, and also modern wooden cats made with WEST system? Like, would a WEST system wooden boat absorb proportionally more or less water than a fiberglass boat? | | | Re: hulls gaining weight?
[Re: Mary]
#71098 04/04/06 04:14 AM 04/04/06 04:14 AM |
Joined: Mar 2006 Posts: 14 Saipan catmech OP
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Posts: 14 Saipan | thanks all, it appears that i have brought up a pretty good topic, I will be "drydocking" my Cat this coming september through October, the winds are pretty much dead during this time as we anticapate typhoons, not a good time to have your cat parked on a beach, so I plan on repairing any hull damage that happened during the season, but I really want to totally dismantle the entire boat just to see if there are any problems arising at all. I would like to "redo" the bottoms gel coat and get rid of the scars from all the beachlandings, I would appreciate any input on such a task. I believe I saw somewhere a KIT to redo the bottom scars but not sure where I saw it. I also have a second set of rudders that I want to refinish in some sort of Plaid material, but Im having trouble locating the plaid material that I wish to use, (something like what Paul Bunyon wore) if you no where to find any plaid type paul bunyon type fabric manufactureres please include a link.
thanks for everybodys help..
regards, Darrell
my wife is a princess therefore I must be a prince
| | | Re: hulls gaining weight?
[Re: catmech]
#71099 04/04/06 04:23 AM 04/04/06 04:23 AM |
Joined: Mar 2006 Posts: 14 Saipan catmech OP
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Posts: 14 Saipan | seriously though do you think that storing the hulls inside a warehouse, with the hatch and drain plug open will dry the hulls in a couple weeks, with outside humidity at around 60-100.?? if I put a 1500 watt heat lamp inside the hull will it damage the hull with intense heat close to the heat lamp?? is there any other way to force dry heat through the hulls?? does anybody have any idea how much?? weight i could lose? I will weigh the hulls as soon as I begin my "drydocking" and again when finished.. Thanks again all.
darrell
my wife is a princess therefore I must be a prince
| | | Re: hulls gaining weight?
[Re: catmech]
#71100 04/04/06 07:36 AM 04/04/06 07:36 AM |
Joined: Jun 2001 Posts: 12,310 South Carolina Jake
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Posts: 12,310 South Carolina | seriously though do you think that storing the hulls inside a warehouse, with the hatch and drain plug open will dry the hulls in a couple weeks, with outside humidity at around 60-100.?? if I put a 1500 watt heat lamp inside the hull will it damage the hull with intense heat close to the heat lamp?? is there any other way to force dry heat through the hulls?? does anybody have any idea how much?? weight i could lose? I will weigh the hulls as soon as I begin my "drydocking" and again when finished.. Thanks again all.
darrell Ummm...yeah...even a 125W heat lamp is plenty to do a lot of damage. Visit my page where I cooked my hull I did hear tale of a guy who mounted his Nacra 6.0 hulls upside down and inclined, built a tent around them, and using several different heaters, brought the temperature way up inside the tent for a day or so. I don't recall exactly what his progress was but I seem to recall he lost something like 8lbs per hull.
Jake Kohl | | | Re: hulls gaining weight?
[Re: catmech]
#71101 04/04/06 10:07 AM 04/04/06 10:07 AM |
Joined: Jun 2001 Posts: 833 St. Louis, MO, Mike Hill
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Posts: 833 St. Louis, MO, | Do not get a heat lamp anywhere near your boat. I made the same mistake on a repair I was doing and totally cooked my hull and warped it. I've seen Sunfish gain over 100lbs from water absorbsion. Here is a way to dry it out safely. Buy a long length of plastic flexible dryer hose. Put the dryer hose in the port hole. Dont tape it in just put it in loosely. Also remove your drainplugs or any other ports that you have. Now put a hair dryer set on low on the other side of the flexible hose. Again don't tape it in. Now just leave it like this for a couple of days and your hull will dry out. Check your temp. in your hulls every hour or so to get the temp right. It should be just warm but not hot. Mike Hill www.stlouiscats.com
Mike Hill N20 #1005
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[Re: catmech]
#71103 04/04/06 09:08 PM 04/04/06 09:08 PM |
Joined: Feb 2006 Posts: 3,348 fin.
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Posts: 3,348 | Keep it simple. If you open the inspection ports and take out the drain plugs, I think you'll be surprised at how quickly the boat dries out, even after just a week.
If the boat is exposed to the sun and no rain is allowed inside, they dry very quickly.
Last edited by Tikipete; 04/04/06 09:09 PM.
| | | Re: hulls gaining weight?
[Re: fin.]
#71104 04/05/06 09:51 AM 04/05/06 09:51 AM |
Joined: Jun 2001 Posts: 833 St. Louis, MO, Mike Hill
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Posts: 833 St. Louis, MO, | Keep it simple. If you open the inspection ports and take out the drain plugs, I think you'll be surprised at how quickly the boat dries out, even after just a week.
If the boat is exposed to the sun and no rain is allowed inside, they dry very quickly. If you keep the boat inside this is true. However when I keep my cat outside water condenses in the hull. I can empty out my hull before leaving the prior week and the following week I always get another cup or two of water out of my hull. This is part of the problem with leaving boats out. The water is constantly condensing and evaporating inside the hull. This is what causes the hulls to eventually delaminate. Mike Hill www.stlouiscats.com
Mike Hill N20 #1005
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[Re: Mike Hill]
#71105 04/05/06 10:38 AM 04/05/06 10:38 AM |
Joined: Feb 2006 Posts: 3,348 fin.
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Posts: 3,348 | Living in Florida, I probably have an even worse problem.
To combat condensation, I leave the ports open, remove the drain plug and elevate the bow. No water accumulation.
Hang a wet towel in the sun, how long does it take to dry?
Last edited by Tikipete; 04/05/06 10:39 AM.
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