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Old 05-28-2020, 05:51 PM
 
Location: Boydton, VA
2,910 posts, read 3,571,346 times
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"added flotation" such as styrofoam added to the nose and stern, that is so that if the boat gets completely swamped, it won't just sink. The ordinary kayak, which has none of that...."Our kayaks did....they had a block of foam in the nose....Wilderness Systems...Pungo.

Regards
Gemstone1
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Old 05-28-2020, 06:31 PM
 
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So adding pool noodles, say, along the length of the floor of the kayak (inside), wouldn't buoy it up in the water?
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Old 05-28-2020, 06:37 PM
 
Location: Northern Maine
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Quote:
Originally Posted by otterhere View Post
So adding pool noodles, say, along the length of the floor of the kayak (inside), wouldn't buoy it up in the water?
Only if it swamps, floating normally no, it will not help raise the height it floats.

Its not for everyone, I have one but recently bought a 14 foot tinny, I have a 10hp outboard for it.
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Old 05-28-2020, 07:42 PM
 
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Think of it this way. Take a quart jar and screw the lid on so it has air inside. Push it down in a bucket water. Then fill the same jar with noodles, close the top, and push it down in the water. Anything inside the jar doesn't displace more water than the air inside the jar. Only by getting a bigger jar do you displace more water.

In the case of a kayak, the best benefit would be to get a larger kayak. Anything else is either added weight or hurts the performance.
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Old 05-28-2020, 10:59 PM
 
41,691 posts, read 43,536,932 times
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Quote:
Originally Posted by otterhere View Post
So adding pool noodles, say, along the length of the floor of the kayak (inside), wouldn't buoy it up in the water?

No, the added weight would actually make it lower. It's no different than adding 50 lb. of lead, they both add weight. Since it's such a small amount of weight it would be negligible compared to the lead.
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Old 05-29-2020, 08:25 AM
 
Location: Myrtle Creek, Oregon
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Add another vote for a bigger boat. A longer kayak will not be as nimble in the water as a smaller boat, but will be about as easy to paddle in a straight line. Every kayak has a weight rating. Look for one with a weight rating about 125 lbs. more than your body weight. Sitting higher in the water will also save you some work.
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Old 05-29-2020, 10:49 AM
 
Location: Raleigh
9,687 posts, read 7,295,387 times
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Originally Posted by otterhere View Post
So NOTHING can be done to add buoyancy? That's surprising!
The closest you would come is filling voids so they can't be filled with water. This is what's commonly done on motor pleasure boats, they use flotation foam. However, they don't make a boat more buoyant, they make a boat "unskinkable" in that they can't be sunk by water. Boston Whaler is famous for marketing this.

That doesn't mean that you can't sink the boat with enough weight; if you loaded the boat full of gold bars it would surely sink.

Think about taking an inflated ball and holding it under the water; with enough force you overcome the buoyancy of the air.

To "add buoyancy" you must in fact actually add volume to the hull; basically make it a bigger boat. Some pontoon or outrigger system that's permanently and unmoveably fastened to the hull.

This wouldn't work for a kayak, but this illustrates the concept: https://www.google.com/search?q=flot...w=1280&bih=864

Those pods are added to the back of a jon boat to allow the boat to run a bit shallower (by buoying the rear end) and to allow for dogs and hunters to more easily enter and leave the boat.
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Old 05-29-2020, 11:14 AM
 
Location: Raleigh
9,687 posts, read 7,295,387 times
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Quote:
Originally Posted by otterhere View Post
So adding pool noodles, say, along the length of the floor of the kayak (inside), wouldn't buoy it up in the water?
Think hard about this. If you filled a balloon with pool noodles, would it drift away in the wind, or fall to the ground? It would fall to the ground, just like a baloon filled with air does, because air+rubber is more dense than air. A balloon filled with helium flys away because the weight of the rubber baloon+helium is less dense than air.

You have air, and you have water. Water is heavier than the air, that's why it collects at the lowest point, if it wasn't it would float around like one sees in outer space. Most solids are denser than air, that's why they don't typically fly away.

You can displace air, or you can displace water. To add buoyancy, that area that is replaced must be less dense than what it's displacing. It's a lot easier to find something that's less dense than water, than it is to find something that is less dense than air.

The inside of the kayak is filled with air. To "buoy it up" as you say, whatever you use to take the place of that air has to be lighter than air.

Conversely, adding something to the outside of the kayak to take the place of the water would make it more buoyant. Adding pool noodles to the bottom exterior of the kayak would make it more buoyant, but would probably make it less stable and difficult to paddle.

Adding pool noodles to the exterior the kayak above the water line, would make it more buoyant only after they're in the water. But adding them to the sides six inches above the waterline, the kayak would still sink at the same rate until you got to the noodles.
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Old 05-29-2020, 02:31 PM
 
18,856 posts, read 57,365,396 times
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You could just kayak in the Dead Sea...
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Old 05-29-2020, 05:39 PM
 
3,068 posts, read 4,165,241 times
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I have a Feathercraft kayak that has sponsons along both sides at the cockpit. They add stability and a little bit of extra buoyancy since they increase the footprint (width) of the boat.

Here is an example of add-on sponsons. http://seawardkayaks.com/Wave_Vidmar...n/DSC_0100.jpg

Feathercraft sponsons were built into the side of the boat and one inflated them so that it looked streamlined and not clunky like the photo. I say "were" as, unfortunately, Feathercraft has gone out of business. Vancouver real estate became too expensive.
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