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Offline riverboater

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Peter inspired pump design
« on: October 08, 2017, 06:33:19 PM »
Back in February heavynets was working on a replacement impeller which Tom is now testing. It looks like it may hold promise as a reasonable cost replacement for the original, and may indeed be tweaked for better performance.

About the same time frame, I was intrigued by the work Peter had done on his boats in Russia. I emailed Peter several times and did some homework. I made a few parts and was able to finnaly test them out this morning.

The short story is... I am not going to improve on the stock Mokai pump any time soon. But I learned allot and enjoyed the process.

I decided to try a longer impeller, which required a longer wear ring area. The impeller had to have overlapping vanes in discussion with Peter and I used the vane angle he had found most productive.

I departed from some of the work Peter did on his Krutov system by incorporating the abilitlty to swap between the rudder system of Krutov and the more traditional "bottle / nozzle " steering.

The Rudder system was unsuccessful on 2 fronts. The amount of spray and back splash was horrendous, and the material I used for the rudder brackets was not up to the task. Even without the rudders the performance was lackluster to say the least.

The nozzle system was much better, and I could operate with this system without problem, albeit at a 3 mph penalty over the stock set up.

Will I pursue this further... probably not.

Pictures attached for your amusement.

Cheers, Steve




« Last Edit: October 08, 2017, 06:38:20 PM by riverboater »

Offline Painlesstom

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Re: Peter inspired pump design
« Reply #1 on: October 08, 2017, 07:45:51 PM »
Well that's pretty impressive to say the least! I like the two piece pump design, would sure make maintenance a little easier. I'd be interested in the .stl for the steering nozzle. Sure would be great if people could have a replacement printed out since Mokai doesn't make those anymore for the old models. Great job!!
Tom

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Offline riverboater

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Re: Peter inspired pump design
« Reply #2 on: October 08, 2017, 09:05:53 PM »
Thanks Tom.

I sent you an email with the stl for the steering nozzle as I did not know how to attach a viable / downloadable copy here.

I printed it using Selective Laser Sintering (SLS) process out of nylon (all the white parts).

I chucked the steering nozzle up on the lathe and created some additional clearance for the pump I made. Not sure if you would have to do the same for the stock pump... I never tried it.

Cheers, Steve

Offline Painlesstom

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Re: Peter inspired pump design
« Reply #3 on: October 09, 2017, 07:07:30 AM »
I got it, thanks Steve. I'm seriously going to have to sit down and learn CAD one day...
Tom

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Offline riverboater

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Re: Peter inspired pump design
« Reply #4 on: October 09, 2017, 09:09:54 PM »

Tom, I tried the nozzle on the factory housing and it is a no-go.

Here is an stl from the original that should be good, although I never have printed one.

http://www.thatjava.com/gallery/d/334-1/Steering+Nozzle+Original_stl?g2_GALLERYSID=251bc7245a50b977bb907fbb2c4ae96e

Cheers, Steve

Offline Painlesstom

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Re: Peter inspired pump design
« Reply #5 on: October 09, 2017, 09:14:35 PM »
Ok, thanks for the update. What was the problem with fitment? I got the new file, thanks again.
Tom

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Offline riverboater

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Re: Peter inspired pump design
« Reply #6 on: October 09, 2017, 11:03:11 PM »
What was the problem with fitment?

Larger bulge / different radius and offset to accommodate the splash shield "ears" on the original.

You can sort of pick out the difference in the photo above (3rd one I think).
« Last Edit: October 09, 2017, 11:08:00 PM by riverboater »

Offline Painlesstom

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Re: Peter inspired pump design
« Reply #7 on: October 09, 2017, 11:11:06 PM »
Ahhh right, I see what you mean. 

If you could look at the original file and see if you see the same thing I am. Looks like there could be a open area that could show up in printing.
Tom

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Offline riverboater

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Re: Peter inspired pump design
« Reply #8 on: October 10, 2017, 08:05:45 PM »
The original is good, I downloaded from the link that I supplied and opened it my slicing program and greated the g-code for printing, and checked the layers. I do not see what you are seeing. Perhaps something with your conversion to jpg?

Offline Painlesstom

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Re: Peter inspired pump design
« Reply #9 on: October 10, 2017, 11:16:14 PM »
I'm seeing this in the preview generated by Shapeways.com. I've uploaded the file twice, same thing both times. I'll try another place and see if it shows up again.
Tom

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Offline Painlesstom

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Re: Peter inspired pump design
« Reply #10 on: October 10, 2017, 11:21:00 PM »
Uploaded to MakeXYZ.com. Looks good there so obviously Shapeways isn't processing something correctly.  \./8
Tom

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