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#572884 - 10/15/19 11:17 AM
Re: New Propeller Design - Sharrow Engineering
[Re: Dock Holiday]
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Joined: Feb 2003
Posts: 11,980
Frantically Relaxing
Admiral
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Admiral
Joined: Feb 2003
Posts: 11,980
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Not much room in an outdrive for a CVT type setup either  I wonder about what this prop could do with 'too much' horsepower... My little old Sea Ray, during the brief period my friend owned it, had what was close to a 500hp 383 pushing her around. Once that engine was installed, the 15x19 SS prop that worked just fine for 15 years blew it's hub out at the first WOT stab. 3 spare aluminum props didn't last long either, they wouldn't grab during a WOT holeshot at all, they'd just start making air, IIRC they blew their hubs during high speed runs at well past 5000 rpm. I drove the thing at Yellowstone Lake with a 15x17 plainjane Merc prop, the boat worked wonderfully until you tried to go fast, even at 6500' that 383 could ventilate that prop at will. That much power in that boat was almost useless  -- so without any trailing edges, I wonder how the Sharrow would've done in that setup... Anyway, very interesting. I also wonder, due to it's design, seems do-able to just 3D print one out of some decent material and go boating! Hit a rock, just make another one...
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#574887 - 02/05/21 07:27 PM
Re: New Propeller Design - Sharrow Engineering
[Re: Dock Holiday]
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Joined: Dec 2003
Posts: 3,982
athiker
Admiral
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Admiral

Joined: Dec 2003
Posts: 3,982
Lake Norman, NC
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Looks like they got the price down to $2k with a 1 year total warranty, including damage. I think the video on the right is pretty new - https://boattest.com/Sharrow-Engine...stcom-newsletter&utm_content=Fri+2.5The original video is on the left, the pricing and ordering info video is on the right. Still expensive certainly compared to other SS but, considering its the first year of production, at least it is in the realm of the same market, vs the $10k it was. I'm kind of excited to see how this is adopted over the next 5 or 10 years. I'm sure it will mostly start with the big, pricey, expensive boats/vessels and then trickle down....how far down is the question. It's just cool to see someone improve a design in so many ways in an industry that has been around as long as shipping and boating.
2000 Cobalt 206 5.7L EFI Alpha 1
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#575676 - 02/18/22 08:47 AM
Re: New Propeller Design - Sharrow Engineering
[Re: Dock Holiday]
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Joined: Dec 2003
Posts: 3,982
athiker
Admiral
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Admiral

Joined: Dec 2003
Posts: 3,982
Lake Norman, NC
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Some updated videos and info at the Boattest link above....really remarkable. Plan to make 10k units in 2022. I can't remember if all of the development backstory info was posted back in 2021, if it was I forgot it, but interesting read if you scroll down a ways.
Sharrow Prop Production for 2022
Greg Sharrow, the propellers’ inventor, has made agreements with three foundries in the U.S. Midwest to cast his props. His company is currently planning on doubling the number of CNC 5-axis routers needed to finish the props to within a tolerance of .003, something nearly impossible to achieve with standard-design cast props. He is planning on casting 10,000 props next year.
Because the Sharrow props are designed for each specific engine and its gear ratio, Sharrow plans to cast the same 15.5" x 15.4" (39.37 cm x 39.12 cm) props used on the twin Yamaha 300s in this test.
2000 Cobalt 206 5.7L EFI Alpha 1
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