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Old 03-07-2019, 06:37 PM   #1
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Game changer props!!

Just came across this and found it very interesting and wanted to share.
Taken from their website:
"The new SHARROW PROPELLERô Is the first major advancement in propeller technology since the 1930s."

"9 - 15% MORE EFFICIENT,dramatically reducing fuel cost"

"LESS WEAR AND TEAR ON ENGINE SYSTEMS + LESS IMPACT ON THE VESSEL"

If those claims wet your whistle, check out the website:
https://www.sharrowengineering.com/#footer-layout

I can see this post igniting a sh!t storm. Remember I'm just the messenger, not the inventor of this thing.
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Old 03-07-2019, 06:56 PM   #2
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Interesting. It looks like it would flex less than a normal blade and the lack of any blade tips likely means less turbulence which typically means more efficiency. I'd give them a shot if I was buying new props.
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Old 03-07-2019, 07:57 PM   #3
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Always applaud those willing to try to build a better mouse trap. Hope it's everything they say it is. My boat isn't high performance, and I'm not an early adopter. So I'll be content to sit and watch.

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Old 03-07-2019, 08:03 PM   #4
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Show me some before and after comparisons that back up the sales pitches. Who can fix it when you bump bottom? The factory? We have all seen claims of improved performance with no supporting data. Color me skeptical.
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Old 03-07-2019, 08:03 PM   #5
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I have seen proposed aircraft designs that utilize that concept. The continuous loop surface without tip vortices is supposed to offer incredible gains. Usually called “closed wings.” Very interesting.

I imagine it would really be easier to apply to marine props than aircraft wings, in retrospect.
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Old 03-07-2019, 08:22 PM   #6
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Cost? I'll bet not in my price bracket so even at 15% increased efficiency I would NEVER , not even close, see a payback, never mind get ahead.

This may be one of those things that has little practical use for most pleasure boats but could have significant impact for high fuel use operators.

As asked also repairs could be a real problem for a long time to come untill in wide use.

Interesting idea though but I too will be waiting to see how it fares.
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Old 03-07-2019, 08:24 PM   #7
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There’s more drag from the connecting part of the blade tips. And interference drag similar to what bi-planes experience.

But tip losses are reduced to some degree and that’sa plus.

May be best for small dia props like small outboards.

May be beneficial and may not. I’d guess not if not betting the whole farm.
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Old 03-07-2019, 09:22 PM   #8
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The Sharrows married into the family, so I've been hearing about this for a few years now. Hoping to get a promotional version, but as somebody mentioned, the $$ from pleasure boaters doesn't touch that spent on fuel between here and China. I'm expecting to wait a couple more years; I'm pretty pumped about it though, and it's hilarious to see it pop up on here.
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Old 03-07-2019, 09:34 PM   #9
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Quote:
Originally Posted by Westiculo View Post
The Sharrows married into the family, so I've been hearing about this for a few years now. Hoping to get a promotional version, but as somebody mentioned, the $$ from pleasure boaters doesn't touch that spent on fuel between here and China. I'm expecting to wait a couple more years; I'm pretty pumped about it though, and it's hilarious to see it pop up on here.
We're all expecting you to pull some strings and get us a group deal. Should be an easy sell to the company...imagine a small herd of very happy computer & social media savvy "pleasure boaters" singing the company praises peppered across the planet
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Old 03-07-2019, 10:06 PM   #10
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Has anyone here received a quote to compare against a standard Michigan wheel?
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Old 03-07-2019, 11:06 PM   #11
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Quote:
Originally Posted by Mischief Managed View Post
Interesting. It looks like it would flex less than a normal blade and the lack of any blade tips likely means less turbulence which typically means more efficiency. .
Quote:
Originally Posted by High Wire View Post
. Who can fix it when you bump bottom?
Quote:
Originally Posted by Nomad Willy View Post
.
But tip losses are reduced to some degree and thatís a plus.
We have all bases covered
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Old 03-08-2019, 06:23 AM   #12
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Should this be 10% as efficient as claimed the big boys will be all over it.


When fuel burn is measured in tons per day ,,,,,,,,,,,,,,
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Old 03-08-2019, 06:24 AM   #13
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Wonder how it would do when it gets tangled in trap lines?
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Old 03-08-2019, 08:12 AM   #14
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We're all expecting you to pull some strings and get us a group deal.
Yep, sign me up!
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Old 03-08-2019, 09:41 AM   #15
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Wonder how it would do when it gets tangled in trap lines?
It may knit you a sock or sweater...

The video is a guy boating on a single engine outboard boat. Nothing about props.

Their website says high-performance boats, so that pretty much cuts trawlers out.

I think it would lose to a Walmart plastic bag.
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Old 03-08-2019, 11:47 AM   #16
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Lots of sales pitch but no published data to back up the claims.
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Old 03-08-2019, 12:03 PM   #17
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We need to see side-by-side performance comparisons. I agree with Simi that a shrouded prop provides better prop protection while minimizing tip turbulence and cavitation.

They claim, "Testing methodology and results were independently analyzed,
reviewed and validated by Applied Universal Engineering of San Diego, CA and HS Marine Propulsion of Ocean Springs, MS."


Why not publish those on the website for all to see?
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Old 03-08-2019, 01:27 PM   #18
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Just marketing with no proof. Color me completely disinterested. I'm not an early adopter and definitely not of a product which doesn't provide relevant test results.

The result details are critical to see what engines in what boats and see if it's in any way relevant to oneself.

The last boating innovation we took a chance on was Sleipner/Sidepower Vector Stabilizers. They presented test results on a boat very similar to the one we were considering them on. Then on top of that Sunseeker had used them on many of the same boat with success.

It may be a great product, but no evidence of that today.
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Old 03-08-2019, 03:15 PM   #19
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Website looks like it is designed to sell stock, not propellers.
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Old 03-08-2019, 05:05 PM   #20
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yeah. I noticed that
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