DIY/Custom intake grate with scoop. Stainless steel plate laser cut. Sanity check on design.

Hey guys,

Hoping to get a little feedback on my design before manufacture.

I've got a stock SJ650. It's my first ski and I'm having a blast on it. I ride on Loch Lomond, and it can get a bit rough, when the ski looses traction it's kind of like hitting the brakes, I've just rode a sx650 and an X2 with fancy intake grates and they didn't have the same issues, so after reading a little I'm assuming the stock grate is where the issue lies.

I have access to a metal laser cutter and a bunch of thin stainless plate, so thought I'd knock up a grate to try out. I'll post the files on here once I'm happy with the design in case anyone else wants to recreate it.

It's going to jigsaw together so be self jigging for welding. I'll 3d print some bits for around the ends to smooth out the lead ins. they'll be epoxied in later.


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Overview of the concept

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Rough dimensions of current concept

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Intake is150mm wall to wall

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Intake roof looks to be at roughly 45 degrees

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90mm depth to driveshaft

I've just thrown the design together quickly, keen to get it made up before the weekend to test. All advice would be very welcome as I've no experience with this.

Thanks.
 

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Looks good but think that a Thin Curved Scoop is going to cause Turbulence as the Water separates from the Scoop as it tends to follow a straight line and pockets of unwanted Turbulence will form at the Separation Zone (Top of Scoop).

Go with Simple Flat Profile or, if possible, shape the Scoop like an upside down Airfoil (Airplane Wing) . The Water will flow faster along the curved section and create a down-force leading to better hook-up...
 
Location
dfw
I would make the leading edge of the scoop 1/2" below hull contour. The scoop doesn't need to be as long as whats pictured. If you do leave it long then reflex the trailing edge a little.
 
Great! Thanks for the feedback.

I found a relatively good side on photo of a works 201 which seems to be well regarded. I've superimposed it on top of the side profile of the scoop and it matches up pretty well I think (image below). It hangs 12mm below the hull line now. I've reduced the number of runners to 3.

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Bit hard to see, but I think it matches up close enough to think the design should work.

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3 ribs now.

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Sizes.

I'll try knock one up this week and see how it performs.

Will post proper designs if it works out well.
 

aboarder

Site Supporter
Location
Goodwood, ON
205 and 201
 

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Great! Thanks for the feedback.

I found a relatively good side on photo of a works 201 which seems to be well regarded. I've superimposed it on top of the side profile of the scoop and it matches up pretty well I think (image below). It hangs 12mm below the hull line now. I've reduced the number of runners to 3.

View attachment 425811

Bit hard to see, but I think it matches up close enough to think the design should work.

View attachment 425812

3 ribs now.

View attachment 425813

View attachment 425814

Sizes.

I'll try knock one up this week and see how it performs.

Will post proper designs if it works out well.
There ya go looks good
 
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