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Fluid dynamics R&D trim nozzle.

fluiddynamicsR&D said:
X-H2o
Hey guys!
I've mainly been developing this for the mini jetboat crowd but it may be of some interest here aswell, I'm not sure if anyone has ever looked at going this route but it offers a few advantages over the standard diverter after nozzle configuration.

Pictured is billet stainless to retain a small footprint while still being durable enough to deal with pumping abrasives and debris but I'd be happy to do a run of aluminium if there's enough interest to suit pumping clean water!

Having the pressure generated directly before the exit means you're not fighting a pressurised Jetstream to turn or trim. Nozzle size can be changed by simply swapping out the insert, this nozzle can go from 70mm upto 90mm.
Clearance between the bowl and deflector is no more than 0.5mm throughout all motion of the nozzle to maintain pressure and accuracy.
I've used a mix of delrin bushes and stainless bearings for a very light and positive steering feel.


Feel free to ask any questions or make suggestions
Click to expand...
I really like your nozzle very nice. I have a commercial fishing boat with 500mm jets that would really benefit from your concept but I realize that I will never see that happening in this life. I would ask how you determine the nozzle diameter except for trail and error I am running about 80% max design horsepower for the jets I have and would like to fine tune the nozzle for that volume.Unfortunately there are no options for this available and I will fabricate whatever is needed. Imagine that a straight ratio of nozzle area to shaft rpm would be too simple,1350 max vs 1200 for example and no there is only one impeller choice. hope this might trigger someone’s interest I can provide pictures and stories of ridiculous jet boats for your entertainment Thanks
 

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Trustmaster said:
I really like your nozzle very nice. I have a commercial fishing boat with 500mm jets that would really benefit from your concept but I realize that I will never see that happening in this life. I would ask how you determine the nozzle diameter except for trail and error I am running about 80% max design horsepower for the jets I have and would like to fine tune the nozzle for that volume.Unfortunately there are no options for this available and I will fabricate whatever is needed. Imagine that a straight ratio of nozzle area to shaft rpm would be too simple,1350 max vs 1200 for example and no there is only one impeller choice. hope this might trigger someone’s interest I can provide pictures and stories of ridiculous jet boats for your entertainment Thanks
Click to expand...
Oh, very cool...

Are those jets stock on that craft? Or added later? Love how far apart they are on the hull--must give some awesome maneuverability.
 
tdonoughue said:
Oh, very cool...

Are those jets stock on that craft? Or added later? Love how far apart they are on the hull--must give some awesome maneuverability.
Click to expand...
tdonoughue said:
Oh, very cool...

Are those jets stock on that craft? Or added later? Love how far apart they are on the hull--must give some awesome maneuverability.
Click to expand...
tdonoughue said:
Oh, very cool...

Are those jets stock on that craft? Or added later? Love how far apart they are on the hull--must give some awesome maneuverability.
Click to expand...
tdonoughue said:
Oh, very cool...

Are those jets stock on that craft? Or added later? Love how far apart they are on the hull--must give some awesome maneuverability.
Click to expand...
 
The boat originally had three 400hp engines and 320mm jets but I put in two 600hp engines and now have 500 mm jets makes for a cleaner engine room. If it started with twp engines they would have been closer to center. Yes it does drop a bucket and things happen. There is a boat out there that has 800hp engines max for the jet that with gear five man crew ect got over 20000 lbs of fish on step so these things work but are crude compared to what is being talked about in these sports boats trying to catch up. Hard to do with a 32 foot max length mine is 16.5 foot wide like pushing a refrigerator through the water.
 
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