Surfriding Avoid sinking and loosing the ski! Brainstorm...

[AirJunky]

dont matter if your hood popped loose for a minute.

Yea, I bet.
So how about solving the hood problem? Is there some sort of hood latch available? Or a 2nd strap?

 

[McDog]

This thread is a train wreck.

 

[OCD Solutions]

This thread is a train wreck.

It's giving me flashbacks...
http://www.x-h2o.com/index.php?threads/nose-foam-options-other-buoyancy-enhancing-ideas.100161/

http://www.x-h2o.com/index.php?threads/help-me-invent-something.85813/

 

[Andersschroder]

So if the engine compartment fills up with water how many lbs of bouyancy would be needed to make it stay afloat. I dont know the math. Can someone chime in?


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[OCD Solutions]

Google is your friend.

http://www.wikihow.com/Calculate-Buoyancy

 

[jonolove]

I have had my ski completely full of water twice it didn't sink either time I only have foam in the tray no noodles required different foam density has a different buoyancy

 

[Andersschroder]

Google is your friend.

http://www.wikihow.com/Calculate-Buoyancy

Senor ocd, can you help me out with that calculation, i just dont get it. Im good with colors but math... no so much.


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[OCD Solutions]

I just provide the tools, it's up to you to make the time and effort to use them.

Or you can do what I did and trust Yamaha Engineers. I took the nose foam out of a SJ and stuck it in the nose of my Matrix to give it a little bit extra buoyancy over stock. My upper foothold area is foamed but the lower tray area is just trapped air. My ski is neutral buoyant with the hood off and the bilge full of water.

 

[Andersschroder]

I have had my ski completely full of water twice it didn't sink either time I only have foam in the tray no noodles required different foam density has a different buoyancy

Which ski you got?


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[jonolove]

Phantom every cubic foot of foam can keep 60# up also the ski itself has buoyancy I prefer 2# foam

 

[Andersschroder]

Phantom every cubic foot of foam can keep 60# up also the ski itself has buoyancy I prefer 2# foam

Im not sure i get it? Can you please rephrase that?


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[jonolove]

Im not sure i get it? Can you please rephrase that?


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For every Sq ft 12in by 12in cube of foam you put in your ski that amount of foam will keep 60lbs floating in water understand?

 

[Andersschroder]

For every Sq ft 12in by 12in cube of foam you put in your ski that amount of foam will keep 60lbs floating in water understand?

Gotha. Thank you! But whats the weight of a rickter with the bay full of water?


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[McDog]

The bay full of water doesn't affect the "weight" of the ski for bouyancy purposes. Surely there are some youtube videos on the subject. It's all about density and water displacement.

 

[Andersschroder]

The bay full of water doesn't affect the "weight" of the ski for bouyancy purposes. Surely there are some youtube videos on the subject. It's all about density and water displacement.

Im just trying to find out how many lbs of bouyancy is needed to keep a fully waterfilled
ski afloat.


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[Ochocoronas]

https://www.uscgboating.org/regulations/assets/builders-handbook/FLOTATION.pdf

It's easy!! Just do the math.

Page 24-31 weight of a swamped boat.

 

[OCD Solutions]

Here's the summary of that link;

Flotation needed to support the swamped boat.
Formula: Fb = A ÷ B = X cubic feet of foam

A = Submerged weight of hull, (who would really know this value?)
B = will be calculated as follows (assuming use of Polyurethane foam of 2.0 lb. density) B = 62.4 – 2.0 = 60.4; then allow for 5% moisture absorption (2.0 x 0.05 = 0.1) B = 60.3 lb.

So, by that equation, a 325 lb ski with 2 lb foam will require 5.4 cubic feet of foam but we know that is not exactly true as that's a poop ton of foam!

I am guessing a stock ski only has about 3 cubic feet of foam at the most to achieve neutral buoyancy so I'm going to estimate the construction of the ski itself accounts for around 125-150 lbs of net buoyancy.

So, weigh your ski, subtract 125 lbs, take that result and divide it by 60.3 and that is roughly how much 2lb foam you need to achieve neutral buoyancy.

Feel free to add extra if room allows.

Simple right?

 

[DAG]

So how many ping pong balls does that equates to?

 

[Ochocoronas]

 

[OCD Solutions]

So how many ping pong balls does that equates to?

@ 3000 according to this link;

http://blog.warningsciencecontent.com/2010/08/03/buoyancy/