January 18, 2015

 

3D Printed Kort Nozzle Upgrade

This is another project I have been playing around with again too. I tried making a few Kort nozzles back in the day out of PVC and while none of them gave me more thrust I did have a little luck with one that actually dropped the amps draw during one test.  So I figured now that I had a 3D printer thing might be easier to make.

The kort nozzle is going to be designed around the Mairfair 750 GPH bigle pump thruster that I normal use on my ROV’s.

This my first design, if it works out I might incorporate the mount right into the nozzle design too.

It slides onto the pump housing and is mounted to the ROV with a plumbing pipe type mount.

Here is the finalized design ready to print…

…and here it is in the process of being printed.

After about 2.5 hours here is the finished product. It’s a little rough as I printed it on a fast setting and low infill just to see if it actually fits.

I took a little tweaking but it fits the pump pretty well.

Here’s what it would like mounted to a PVC frame.

I wasn’t sure what to do for the prop clearance so the first one is about .05″ I just need to get it in the thrust tank to see how it works.

The results were….

Without the nozzle
Forward thrust was 2.2 Lbs @ 6.3 amps (12.38 volts)
Reverse Thrust was 1.5 Lbs @ 6.2 amps

With the Nozzle
Forward thrust was 3.0 Lbs @ 6.1 amps
Reverse Thrust was 1.5 Lbs @ 5.8 amps

I’d say that was a pretty favorable increase in Forward thrust with the New nozzle.

Overall I’m pretty happy with them considering I just traced the nozzle pattern from a picture.

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