The standard detachable plastic foam floatation module offered by Wavewalk kayaks is 56″ (1422mm) long, and 2.5″ (65mm) in diameter. Its volume is approximately 250 cubic inches (4.1 litres), or roughly 1 gallon.
The extra large (XL) “jumbo” detachable plastic foam floatation module offered by Wavewalk kayaks is 58″ long (1475mm), and 4″ (100mm) in diameter. Its volume is approximately 700 cubic inches (11.5 litres), or 3 gallons. This means that it’s nearly 3 times as effective as flotation compared to the standard flotation module.
In other words, the XL flotation module offers a net buoyancy that’s almost three times bigger that that offered by the standard floatation module, or roughly 25 lbs (11.4kgs), while the standard floatation module offers just about 8 lbs (3.6kgs) of net buoyancy.
Extra large (XL) and standard size detachable flotation modules
In practical terms, this means that you can make a very dense object weighing 25 lbs such as a lead weight stay close to the surface of the water and not sink to the bottom, if you attach it to an XL flotation module.
An object’s density is measured by its volume divided by its weight.
The density of water is 1.
If the object you want to save from drowning is less dense than lead, it can be heavier than 25 lbs and still be recovered by being attached to an XL flotation module. The less dense the object, the heavier it can be, since more of its weight will be supported by its own volume.
Objects with a density of 1 or less don’t require flotation to stay afloat, since the density of water is 1, and therefore they are lighter than water.
Most kayaks are moulded from Polyethylene resins. Polyethylene is slightly less dense than water, but a Polyethylene kayak could still sink to the bottom if its hull gets filled was water because of the weight of the accessories attached to it, such as rubber handles, rod holders that have metal parts in them, and rivets, let alone a motor…
How To Attach Extra Large Side Flotation Modules To The W500 J Series Kayak?
If you’re driving a motorized W500, you’ll be going at a high speed, which would raise the kayak’s bow, and lower its stern. In such case, the rear pair of XL side flotation modules might occasionally come in contact with the water, and spray you… In order to avoid it, you’d need to attach the front end of the rear flotation modules higher than the rear ends of the front pair, as shown in this image:
How to attach the front end of the rear float higher than the rear end of the front float
How to attach the front end of the rear float higher than the rear end of the front float – Option II
How to attach the front end of the rear float higher than the rear end of the front float – Option II – Detail
Note: XL flotation modules are wider than standard ones, and attaching them on the sides of your W kayak would make it less easy to paddle. Therefore, we recommend using XL flotation modules only in cases where they are required.
Read more about detachable flotation.