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Sharrow Prop - Testing Results

Old 11-09-2018, 09:21 PM
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Default New Propeller Design

Has anyone tried these yet ? Company states the following. "9-15% more efficient. The first major advancement in propeller technology since the 1930s. Its design, enabled by modern computer modeling and additive manufacturing, has solved the most basic problem of rotary propulsion. It is suitable for all marine applications, including freighters, tankers, workboats, pleasure craft, personal watercraft, unmanned surface vehicles, submersibles and high-speed watercraft, as well as extensions to aeronautical use on aircraft, UAVs, fans, compressors, turbines and jet engines."


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05-23-2019, 05:17 AM
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Sharrow prop good for sharrow water.






sorry, hey, someone had to say it.
Old 11-09-2018, 09:49 PM
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Link?
Old 11-09-2018, 09:57 PM
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Great. Imagine the reduction in induced drag. I’ll hereby sign up my dinghy as a test boat....
Old 11-09-2018, 10:03 PM
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Never seen one before but if it sounds too good to be true...
Old 11-09-2018, 10:05 PM
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Who's the company?
Old 11-09-2018, 11:16 PM
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https://www.marinelink.com/news/new-...roduced-443669
Old 11-10-2018, 12:43 AM
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I can't speak to it's efficiency but it sure looks fragile.
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Old 11-10-2018, 12:58 AM
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Originally Posted by boatymcboatface1 View Post
Who's the company?
Sharrow Engineering. This prop looks ve-ry interesting . But boyohboy I bet it would hard to get one fixed after the 1st prop strike. Not to mention the original cost including multiple props to obtain best results with an unfamiliar prop design. .
And if a Sharrow-equipped boat was transiting an unavoidable weedy windrow, would it be more likely to hold weed or other debris fouling in the slots and stop proper waterflow dynamics?
The Propeller - Sharrow Engineering

Wonder if or when or it might make it on the general market for any public application .


I'd be a scosh skeptical of this news if it was released on 4/1.
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Old 11-10-2018, 03:42 AM
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Looks like a kids pinwheel, they worked pretty well!
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Old 11-10-2018, 05:26 AM
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If you reduce drag with the prop won’t you also be reducing thrust? I would think you would need a larger diameter prop or more effective pitch.
Old 11-10-2018, 06:28 AM
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That is just beautiful - need those for your 627's.
Old 11-10-2018, 06:38 AM
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All of the thrust created by a propeller is on the outside 10% of the blade. That is why the bigger diameter wheel you can use, the more efficient it will be because that outside edge is longer, which crates more thrust. Interesting design in that it (in theory) is reducing the drag by getting rid of the part of the blades that essentially do nothing. If you have ever seen one, look at a submarine prop. Many are 6 or 8 blades that more closely resemble boomerang shapes attached to a hub. Creates a loooong outside blade edge for max efficiency.
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Old 11-10-2018, 07:01 AM
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Originally Posted by gator1 View Post
All of the thrust created by a propeller is on the outside 10% of the blade. That is why the bigger diameter wheel you can use, the more efficient it will be because that outside edge is longer, which crates more thrust. Interesting design in that it (in theory) is reducing the drag by getting rid of the part of the blades that essentially do nothing. If you have ever seen one, look at a submarine prop. Many are 6 or 8 blades that more closely resemble boomerang shapes attached to a hub. Creates a loooong outside blade edge for max efficiency.

and super quiet running...important for submarines
Old 11-10-2018, 07:37 AM
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Made in China?
Old 11-10-2018, 08:22 AM
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Not one real world comparison on their website. Hmmm
Old 11-10-2018, 07:20 PM
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I kind of doubt that one of those props has ever been made anywhere. From looking through the website and reading everything on the website it looks like it is just a brochure to solicit Venture Capital funding. I didn't see any real pictures or any real test data anywhere. Maybe I missed it, I'm not infallible.

Maybe it will work great,. If one of you all who has a whole lot of money wants to invest I'm sure they'd love to hear from you.
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Old 11-10-2018, 07:37 PM
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I have no idea if it would work as claimed or not - but I would remain completely open minded and be very interested to see some comparison tests. It does sound like they are going after the ship market and not small leisure boats though.
Old 11-10-2018, 08:55 PM
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I wonder what 'more efficient' means in this context? Are they saying that you can travel 9 - 15% faster at the same engine loadings through better propeller 'drive'? Or are they saying that you will save that much fuel at the same speeds? Sort of the same but not quite.
Old 11-11-2018, 05:18 AM
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Originally Posted by Aliboy View Post
I wonder what 'more efficient' means in this context? Are they saying that you can travel 9 - 15% faster at the same engine loadings through better propeller 'drive'? Or are they saying that you will save that much fuel at the same speeds? Sort of the same but not quite.
If I was betting money I would be putting it on fuel efficiency.

I seem to recall reading about tip vortex as a major cause of thrust reduction. I wonder if the "loop" design somehow eliminates or reduces tip vortex as an issue. Regardless, I don't see this coming to an outboard near you any time soon.
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Old 05-21-2019, 09:54 PM
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Default Sharrow Prop?

Just saw this. What does the brain trust think?
Home - Sharrow Engineering




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