$txt['youtube'] = 'YouTube'; $txt['youtube_invalid'] = '#Invalid YouTube Link#'; Performance Impeller

Author Topic: Performance Impeller  (Read 21023 times)

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Offline Heavynets

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Re: Performance Impeller
« Reply #15 on: July 23, 2015, 10:08:09 AM »
I played with this calculator.  http://www.vicprop.com/displacement_size.php

It's for standard props, not turbines, but it gave me a "feel" for how turbine design might work.  The number of blades increases as the diameter goes down.  Given the small diameter limitation in the Mokai, I'm GUESSING more blades (more than 3) MIGHT help.

Besides, I have to believe that Mokai didn't just randomly happen upon their design. Surely there was some logic involved and were aware of jet ski designs.  I doubt if they had the time or money to develope the optimal design.  However, it is probably close, dispite being a compromise that considered time, cost and performancee and limitations due to other design considerations. All engineering designs go through the same compromises and no two engineers will always make the same choices.

I would be amazed if even 2 mph can be gain by a new design.  And there most likely will be a tradeoff in ______?????  I just enjoy messing with this stuff.  Maybe I can come up with one that the blade number and pitch can be adjusted for R&D purposes.

Offline Painlesstom

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Re: Performance Impeller
« Reply #16 on: July 23, 2015, 07:44:54 PM »
Well, if anyone could figure out a more efficient impeller, you would be the one with the brains to make it happen. This process is beyond my cut and paste, trial and error methods. Thanks for sharing your engineering expertise, I know there are several people watching this thread to see what you do one day.  \./8
Tom

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Offline cjyoung

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Re: Performance Impeller
« Reply #17 on: August 31, 2016, 01:50:13 AM »
Thanks for the good discussion.  Sounds like I'm stuck with whatever it came with from the factory.  Guess I'll focus on the engine instead.

Offline Painlesstom

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Re: Performance Impeller
« Reply #18 on: August 31, 2016, 07:34:06 AM »
There's not much you can do with the Honda engine for performance other than keeping it tuned up. Wear ring makes a huge difference so make sure it's in good shape with no grooves. I always have aluminum rings in stock if you need one.
Tom

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Offline Heavynets

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Re: Performance Impeller
« Reply #19 on: October 17, 2016, 02:51:34 PM »
"The fun part is figuring out what thread size is inside it, left hand threads at that. I have several pumps I'm rebuilding right now, will have to see if I can figure that out."

Tom, can you post a drawing with the inside dimensions of the impeller?

Offline Painlesstom

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Re: Performance Impeller
« Reply #20 on: October 17, 2016, 03:15:22 PM »
I just assembled the two I have on hand, but have four more inbound, I'll see what I can come up with in a week or so.
Tom

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Offline Painlesstom

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Re: Performance Impeller
« Reply #21 on: October 19, 2016, 02:52:45 PM »
Here are some pics, hope they help. The thread gauge is showing 14 TPI SAE thread pitch.
Tom

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Offline Painlesstom

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Re: Performance Impeller
« Reply #22 on: October 24, 2016, 10:55:26 AM »
Just got a test nut in. The impeller thread is LH 7/8-14
Tom

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Offline Heavynets

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Re: Performance Impeller
« Reply #23 on: October 26, 2016, 12:40:56 AM »


Would this work?  The stray lines are because I need to update my graphics card.  I'll add the blades later after I'm sure what the base cone looks like.
« Last Edit: October 26, 2016, 12:44:19 AM by Heavynets »

Offline Painlesstom

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Re: Performance Impeller
« Reply #24 on: October 26, 2016, 07:10:24 AM »
Picture is a little small, hard to see. Any way you could get it larger?
Tom

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Offline Heavynets

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Re: Performance Impeller
« Reply #25 on: October 26, 2016, 09:24:03 AM »
No, but I should have a new graphics card in about 2 weeks.

Offline Heavynets

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Re: Performance Impeller
« Reply #26 on: October 26, 2016, 09:31:10 AM »


Is this any better?

Offline Painlesstom

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Re: Performance Impeller
« Reply #27 on: October 26, 2016, 09:39:24 AM »
I'm seeing the exact same picture. File size and resolution are the same. Windows has a Snipping Tool that works great, not sure what you have though. But looking at that I realized I didn't provide the measurements to locate the thread area, so I'll get some more numbers for you today.
Tom

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Offline Hillbilly

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Re: Performance Impeller
« Reply #28 on: October 26, 2016, 10:19:07 AM »
Enjoying this discussion.  Thanks, guys.

Offline Painlesstom

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Re: Performance Impeller
« Reply #29 on: October 26, 2016, 10:27:03 AM »
Maybe this will have some more info for you.
Tom

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