Homemade Ball Scupper

[xeriotti]

Last weekend i encountered myself face to face with disaster... I was jumping a boats wake, fell and landed a few meters from my ski... swim a little and when i got to it.. IT WAS HALF FULL OF WATER!!!... inmediately checked my scupper valve (a trapdoor style scupper valve) and Oh Surprise!... The whole "door" was gone.... So i vas 100 yds from the shore with a 2 inch hole in my hull... electric bilge cant keep up to that... so i started pushing the ski to the shore (i wasnt able to restart it...intake was underwater when i got there)....
A couple minutes later it ended pointing down and i could only see the tip of the tail and it kept sinking so i took off my life jacket and wrapped it to the handpole... A friend in another stand up came and we managed to take it to the shore... It was really scary... No cash to build another one!!!

Soooooooooo.... Heres my solution to those untrusty trapdoor style scuppers... I made my own ball scupper

Started from a 100mm nylon bar

Turned and faced exterior to square it off

Inner cone..

Outer cone and ping pong ball seal test...

Made a retainer pin out of a hex stainless bolt...

Valve done... Now install it and try to keep my investment afloat!!!

 

[Big Kahuna]

Pretty Cool!

 

[jo5hi3]

Does the ping pong ball seal? I made some tray drains before thrust released theirs. I used solid delrin balls.

 

[restosud]

ping pong ball may collapse so keep an eye on it.
the taper of the hole should be a bit steeper as you don't want the ball to wedge itself if pushed back during a tail landing.
cutting an oring groove where the ball seats will improve sealing also.

 

[xeriotti]

Does the ping pong ball seal? I made some tray drains before thrust released theirs. I used solid delrin balls.

The ping pong ball seals better than the trap door scupper...

ping pong ball may collapse so keep an eye on it.
the taper of the hole should be a bit steeper as you don't want the ball to wedge itself if pushed back during a tail landing.
cutting an oring groove where the ball seats will improve sealing also.

How would the ping pong ball collapse? Its designed to be beaten hard as f*** by a chinese guy... In here its safe, contained by a cage that protects it from every danger in the world.... Even if it fails to float.... it will work due to pressure difference between the inside of the hull and the outside world.

The oring may work... but its another piece added to the puzzle and siometimes the KISS principle is king.

 

[Jyzmbe]

The thrust scupper ball gets stuck a lot


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[Tyler Zane]

I love the idea and it looks great! But I have to agree, a ping pong ball seems a bit chintzy. Hitting a ping pong ball with a padded piece of wood is one thing, but doing a huge tail landing and water crushing it is another. Who knows, it may last. Wouldn't hurt to consider replacements.

 

[Kaylee.S]

Maybe you can drill a hole in the ping pong ball and fill it with silicone? or great stuff?

 

[Tyler Zane]

Mcmastercarr has a large assortment of balls. All kinds of materials and sizes.

 

[Big Kahuna]

Mcmastercarr has a large assortment of balls. All kinds of materials and sizes.

Silly boy, you know you cannot buy "Balls!".

If the ball crushes, just replace it.

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[Tyler Zane]

Silly boy, you know you cannot buy "Balls!".

If the ball crushes, just replace it.

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I'd be concerned that it may get crushed at the worst time and sinks a ski.

 

[Sasquachcrap]

Going to be a whole lot worse day when that key flys out and kills someone. Number one rule to running a lathe. Never leave the key in the chuck.


Other then that.... Grate job

 

[ajmps1]

I wonder how you could make a scupper that seals when the ski is upsidedown too

 

[orangefinger]

it all depends on the quality of the ping pong ball......in general nothing is perfect in regards to draining.....scupper , ball, duck.....

 

[ajmps1]

it all depends on the quality of the ping pong ball......in general nothing is perfect in regards to draining.....scupper , ball, duck.....

So 5 star balls would be the best right? No 2 star clunkers

 

[Jyzmbe]

I wonder how you could make a scupper that seals when the ski is upsidedown too

Magnet like the epic scupper


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[xeriotti]

Going to be a whole lot worse day when that key flys out and kills someone. Number one rule to running a lathe. Never leave the key in the chuck.


Other then that.... Grate job

You´re right!... My bad

This weekend ive been busy with other projects... Ill try the new blal scupper during the week... nothiung like jetskiing to make the week shorter

 

[Fro Diesel]

Silly boy, you know you cannot buy "Balls!".

If the ball crushes, just replace it.

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Its not that easy...

 

[ajmps1]

How about the spring acuated one way plumbing valves? Anyone still using them?? I was replacing my parents sump pump today and remebered the oneways used to be the go to. With a heavy spring in there i dont see how airs gonna sneak in with an upside down ski

 

[Tyler Zane]

How about the spring acuated one way plumbing valves? Anyone still using them?? I was replacing my parents sump pump today and remebered the oneways used to be the go to. With a heavy spring in there i dont see how airs gonna sneak in with an upside down ski

When your ski is upside down, it's not about air sneaking in, it's air sneaking out. A heavy spring would prevent air from escaping but would also work against its original purpose, letting water out..