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03-07-2019, 05:37 PM
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#1
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Veteran Member
City: B
Vessel Name: Sugar
Vessel Model: Vripack
Join Date: Apr 2018
Posts: 78
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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 PROPELLER™ 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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03-07-2019, 05:56 PM
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#2
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Guru
City: Hampton Beach, NH
Vessel Name: Mischief Managed II
Vessel Model: 1992 Tollycraft 44 CPMY
Join Date: Oct 2018
Posts: 675
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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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03-07-2019, 06:57 PM
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#3
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Guru
City: Fort Myers, FL... Summers in the Great Lakes
Vessel Name: Slow Hand
Vessel Model: Cherubini Independence 45
Join Date: Dec 2010
Posts: 12,834
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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.
Ted
__________________
Blog: mvslowhand.com
I'm tired of fast moves, I've got a slow groove, on my mind.....
I want to spend some time, Not come and go in a heated rush.....
"Slow Hand" by The Pointer Sisters
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03-07-2019, 07:03 PM
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#4
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Guru
City: Cape May, NJ
Vessel Name: Irish Lady
Vessel Model: Monk 36
Join Date: Dec 2007
Posts: 4,964
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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.
__________________
Archie
Irish Lady
1984 Monk 36 Hull #46
Currently in Cape May, NJ
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03-07-2019, 07:03 PM
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#5
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Senior Member
City: PNW/Seattle-ish
Vessel Name: M/V Peter Iredale ;)
Vessel Model: rusting hulk
Join Date: Feb 2018
Posts: 128
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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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03-07-2019, 07:22 PM
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#6
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Guru
City: Gibsons, B.C., Canada
Vessel Name: Island Pride
Vessel Model: Palmer 32'
Join Date: Oct 2007
Posts: 4,414
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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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03-07-2019, 07:24 PM
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#7
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Guru
City: Concrete Washington State
Vessel Name: Willy
Vessel Model: Willard Nomad 30'
Join Date: Oct 2007
Posts: 18,743
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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.
__________________
Eric
North Western Washington State USA
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03-07-2019, 08:22 PM
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#8
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Senior Member
City: Boston
Vessel Name: Rose Mary
Vessel Model: 42 Grand Banks Motoryacht - 1985
Join Date: Feb 2017
Posts: 271
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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 $$ from pleasure boaters doesn't touch that spent on fuel between here and China. I'm expecting to wait a couple more years; I'm pretty pumped about it though, and it's hilarious to see it pop up on here.
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03-07-2019, 08:34 PM
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#9
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Guru
City: Kitimat, North Coast BC
Vessel Name: Badger
Vessel Model: 30' Sundowner Tug
Join Date: Jul 2012
Posts: 5,946
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Quote:
Originally Posted by Westiculo
The Sharrows married into the family, so I've been hearing about this for a few years now. Hoping to get a promotional version, but as somebody mentioned, the $$ 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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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
__________________
"The most interesting path between two points is not a straight line" MurrayM
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03-07-2019, 09:06 PM
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#10
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Guru
City: Seattle
Join Date: Jun 2012
Posts: 3,312
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Has anyone here received a quote to compare against a standard Michigan wheel?
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03-07-2019, 10:06 PM
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#11
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Guru
City: Queensland
Vessel Model: Milkraft 60 converted timber prawn trawler
Join Date: Jul 2016
Posts: 5,482
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Quote:
Originally Posted by Mischief Managed
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. .
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Quote:
Originally Posted by High Wire
. Who can fix it when you bump bottom?
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Quote:
Originally Posted by Nomad Willy
.
But tip losses are reduced to some degree and that’s a plus.
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We have all bases covered
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03-08-2019, 05:23 AM
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#12
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Guru
Join Date: Oct 2007
Posts: 22,553
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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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03-08-2019, 05:24 AM
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#13
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Guru
Join Date: Jun 2008
Posts: 5,037
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Wonder how it would do when it gets tangled in trap lines?
__________________
Jay Leonard
Ex boats: 1983 40 Albin trunk cabin, 1978 Mainship 34 Model 1
New Port Richey, Fl
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03-08-2019, 07:12 AM
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#14
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Guru
City: Reedville, VA
Vessel Name: Wingspan
Vessel Model: Aluminum Catamaran
Join Date: Aug 2018
Posts: 580
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Quote:
Originally Posted by MurrayM
We're all expecting you to pull some strings and get us a group deal.
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Yep, sign me up!
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03-08-2019, 08:41 AM
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#15
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Guru
City: Melbourne, FL
Join Date: Dec 2014
Posts: 1,731
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Quote:
Originally Posted by jleonard
Wonder how it would do when it gets tangled in trap lines?
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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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03-08-2019, 10:47 AM
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#16
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Senior Member
City: Kiln,MS
Join Date: May 2016
Posts: 457
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Lots of sales pitch but no published data to back up the claims.
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03-08-2019, 11:03 AM
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#17
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TF Site Team
City: California Delta
Vessel Name: FlyWright
Vessel Model: 1977 Marshall Californian 34 LRC
Join Date: Apr 2008
Posts: 13,728
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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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03-08-2019, 12:27 PM
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#18
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Guru
City: Fort Lauderdale. Florida, USA
Join Date: Jan 2014
Posts: 21,449
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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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03-08-2019, 02:15 PM
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#19
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Senior Member
Join Date: Feb 2011
Posts: 305
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Website looks like it is designed to sell stock, not propellers.
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03-08-2019, 04:05 PM
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#20
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Guru
City: Campbell River
Vessel Name: Okisollo
Join Date: Apr 2012
Posts: 783
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yeah. I noticed that
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