sunk my brand new 2015 WDK rip...she gone

Lumpy

Lumpy

Location
Iowa
Roseand said:
Im going to cap off my exhaust and plug my carb, etc. and do a sink test with mine at the boat launch(it's shallow). It'll be stuffed completely full of pool noodles, and it'll be interesting to see if it floats.. IMO it's no risk, just reward to see if it floats.


For what it's worth, I've seen/helped recover a waterlogged superfreak circus. However, it still just bobbed right under the surface(floating), with no foam. Just a completely sealed tray, which is hard to do..
2 part foam isn't really an option on the rip without extensive amounts of work and converting thru hull fittings, so you have to do something else. That's why I'm interested to see if pool noodles will do it. If anything, at least they'll displace a lot of water and allow you to hold it while it's sinking for longer.

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Just forget you have to add the volume of your intake and exhaust tract to equation. If you plug them it won't simulate a real sinking situation.
 
Roseand

Roseand

The Weaponizer
Site Supporter
Location
Wisconsin
Lumpy said:
Just forget you have to add the volume of your intake and exhaust tract to equation. If you plug them it won't simulate a real sinking situation.
Click to expand...
Intake doesn't hold much of anything. But yeah exhaust tract would hold a good bit of water for sure.

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rubbertoe

rubbertoe

X-H20 certified
Location
San Diego
It would be hard to recreate n accurate scenario that would determine if a boat will float or sink under a controlled environment .There are so many different variables in a real life scenario.I think what really helps a boat to not sink is lack of air displacement,basically an air bubble or air pocket of sort is your best hope ,foam will buy some time as well . Roseand You want fun,Tie some pool noodles around your motor and lets see how many it takes to float it .I like your enthusiasm ,post findings and video please .To the OP im sorry for your misfortune and wish you the best at recovering your ski thats a real bummer .
 
Quinc

Quinc

Buy a Superjet
Location
California
From the iboats forum:

"Okay,

So i'm kinda of tired of reading about should you or shouldn't you use pool noodles. Seems that nobody (or atleast no one i could find using the search has actually figured out how much one would float)

So i did today. I hope this helps those of you who are looking at how much floatation you need.

Step 1 Figure out how much you will need

So what i'm doing is figuring out the negative buouancy of the major components, those being the hull and the engine. These calculations are for salt water, once i have these done i'll add a fresh water coefficient.

Hull Calculation

w =Weight of the Aluminum Hull 1800
sw =Specific weight of AL = 2.6 (In salt water)
pb = Positive Buoyancy of Hull w/sw , 1800/2.6 = 692.3

Now you need to find the negative buoyancy as that is why you need flotation

NB w-pb 1800 - 692.3 = 1107

So now i need enough flotation to float 1107 lbs (hull)


Now i do the same for the driveline


Drive Line

w =Weight of the engine 640
sw =Specific weight of Cast IRon= 7 (In salt water)
pb = Positive Buoyancy of Hull w/sw , 640/7 = 91.5

Now you need to find the negative buoyancy as that is why you need flotation

NB w-pb 640 - 91.5 = 548

Totals
Total Negative Buoyancy (salt water) is 1655 lbs

Now you can compensate for fresh water by adding 2.5% to that number and a safety factor of 1.3%

1655lbs * 2.5% = 41.36

Fresh water buoyancy is 1696.4

with Safety factor

1696.4 * 1.33% = 22.6

tbw =Total buoyancy weight = 1719 lbs


Step 2 : the pool noodle

I rigged up a pool noodle to figure out how much it will float ( using my Wife's work out weights)

I found that 44 inches will float 8lbs. So that is .18 lbs/inch of pool noodle. or 2.16 lbs per / foot (12 inches * .18)

Okay so to build in some more safety lets say it is an even 2lbs per foot. So if i take my calculated boat weight from above

1719lbs / 2 = 859.5 feet of pool noodle. (now i did this as not all pool noodles are the same length.

860 / 5(foot lengths) gives me a grand total of 171.9 Pool noodles to keep my ship afloat.

So like anything, do some math to see if they will work in your boat. If it is pool noodles, pink stuff from Lowes, or poured in foam. If you don't use enough, its just gonna sink.
 
chadman154

chadman154

#Itsonlymoney !!!!!
Location
Dirty south
Quinc said:
From the iboats forum:

"Okay,

So i'm kinda of tired of reading about should you or shouldn't you use pool noodles. Seems that nobody (or atleast no one i could find using the search has actually figured out how much one would float)

So i did today. I hope this helps those of you who are looking at how much floatation you need.

Step 1 Figure out how much you will need

So what i'm doing is figuring out the negative buouancy of the major components, those being the hull and the engine. These calculations are for salt water, once i have these done i'll add a fresh water coefficient.

Hull Calculation

w =Weight of the Aluminum Hull 1800
sw =Specific weight of AL = 2.6 (In salt water)
pb = Positive Buoyancy of Hull w/sw , 1800/2.6 = 692.3

Now you need to find the negative buoyancy as that is why you need flotation

NB w-pb 1800 - 692.3 = 1107

So now i need enough flotation to float 1107 lbs (hull)


Now i do the same for the driveline


Drive Line

w =Weight of the engine 640
sw =Specific weight of Cast IRon= 7 (In salt water)
pb = Positive Buoyancy of Hull w/sw , 640/7 = 91.5

Now you need to find the negative buoyancy as that is why you need flotation

NB w-pb 640 - 91.5 = 548

Totals
Total Negative Buoyancy (salt water) is 1655 lbs

Now you can compensate for fresh water by adding 2.5% to that number and a safety factor of 1.3%

1655lbs * 2.5% = 41.36

Fresh water buoyancy is 1696.4

with Safety factor

1696.4 * 1.33% = 22.6

tbw =Total buoyancy weight = 1719 lbs


Step 2 : the pool noodle

I rigged up a pool noodle to figure out how much it will float ( using my Wife's work out weights)

I found that 44 inches will float 8lbs. So that is .18 lbs/inch of pool noodle. or 2.16 lbs per / foot (12 inches * .18)

Okay so to build in some more safety lets say it is an even 2lbs per foot. So if i take my calculated boat weight from above

1719lbs / 2 = 859.5 feet of pool noodle. (now i did this as not all pool noodles are the same length.

860 / 5(foot lengths) gives me a grand total of 171.9 Pool noodles to keep my ship afloat.

So like anything, do some math to see if they will work in your boat. If it is pool noodles, pink stuff from Lowes, or poured in foam. If you don't use enough, its just gonna sink.
Click to expand...

So rosie needs 135ft of noodles in the rip??? Sounds legit.....
 
Roseand

Roseand

The Weaponizer
Site Supporter
Location
Wisconsin
chadman154 said:
So rosie needs 135ft of noodles in the rip??? Sounds legit.....
Click to expand...
Did you factor in the buoyancy of the composite layup? What about the padding/turf used in the tray, etc. There's a ton of other variables, nearly impossible to calculate exactly what you need, so your best bet is being overkill or testing it yourself. In this case, it's realistic to fit approximately 10 pool noodles, I don't know what length the ones I have are.
Sounds to me like pool noodles aren't real buoyant from that experiment, but it'd still be interesting to test. But, like I said, they at least cause some displacement and buoyancy allowing for it to maybe be realistic to hang onto it as it's sinking.
I'd like to compare the buoyancy between noodles, EPS/EPP, and 2 part. It's always possible to make a mold to pour 2 part in to stuff into areas in an open bulkhead ski if it's that much more buoyant. Then if it ever becomes wet, you can replace it rather than cut open a whole ski.. EPS style foam is a mess since it's easy to crumble and cut cleaning, making it easy to clog versiplugs and such.

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Ducky

Ducky

Back in the game!
Location
Charlotte, NC
Pool noodles degrade and break up. Id rather be noodle-less and have working versi plugs than have freakin' noodles all in my engine bay and have the high probability that bits and pieces of the noodle will break off and clog up the versi plug.

But hey, im a fan of natural selection.
 
Ducky

Ducky

Back in the game!
Location
Charlotte, NC
Harbor said:
Average length maybe 5 ft so about 27 noodles ?
Click to expand...

Yea I looked around for a couple other calculations and was coming up with 25 noodles for a roughly 300 pound ski.

Keep in mind that while the hull is buoyant, when it is sinking, it is no longer a hull. It is a bucket. Go take a 5 gallon bucket to the lake and slowly fill it up and sink test that bitch.
 
Roseand

Roseand

The Weaponizer
Site Supporter
Location
Wisconsin
25 noodles is unrealistic. So, is it even possible to make a short, open bulkhead ski to float in a worst case scenario?
You can have a perfectly built ski and still have something crazy happen. Accidents happen.
I mean I wouldn't be too worried if wakezone and such still had coverage plans, but nobody does..

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Ducky

Ducky

Back in the game!
Location
Charlotte, NC
Roseand said:
25 noodles is unrealistic. So, is it even possible to make a short, open bulkhead ski to float in a worst case scenario?
You can have a perfectly built ski and still have something crazy happen. Accidents happen.
I mean I wouldn't be too worried if wakezone and such still had coverage plans, but nobody does..

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Sure there are plenty of things you can do....like ride with friends that also have reliable skis and a tow rope. Not much is going to save something from sinking unless it is being saved by something that is powered. If you are going to ride yourself, stay right in front of the launch.
 
Roseand

Roseand

The Weaponizer
Site Supporter
Location
Wisconsin
Stock skis with waterlogged foam still float, so let's transfer that to an am hull that's 75-100lbs lighter . Not everyone can ride close to a launch due to no wake zones and minimum distances, and it's hard to ride with friends when nobody rides other than you on your lake.

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Ducky

Ducky

Back in the game!
Location
Charlotte, NC
Roseand said:
Stock skis with waterlogged foam still float, so let's transfer that to an am hull that's 75-100lbs lighter . Not everyone can ride close to a launch due to no wake zones and minimum distances, and it's hard to ride with friends when nobody rides other than you on your lake.

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Yes, they float. Lots of things float, but they dont float when they start taking on water like crazy.
 
Roseand

Roseand

The Weaponizer
Site Supporter
Location
Wisconsin
Lumpy said:
Costs me 160 a year to alleviate this problem. Well worth it.
Click to expand...
Yeah, lucky you. Wakezone is done with skis for new customers. Absolutely sucks for the rest of us.

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