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#572859 - 10/12/19 09:51 AM New Propeller Design - Sharrow Engineering  
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Dock Holiday Offline
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Here is a video from BoatTest.com on an interesting new propeller design from a company called Sharrow Engineering.

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#572860 - 10/12/19 12:03 PM Re: New Propeller Design - Sharrow Engineering [Re: Dock Holiday]  
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Jack T Offline
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Wow! I wonder how expensive.


Have a great day of boating
2012 Monterey 224 FS,
300 HP Volvo Penta with catalytic converters

#572861 - 10/12/19 12:44 PM Re: New Propeller Design - Sharrow Engineering [Re: Jack T]  
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Dock Holiday Offline
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Originally Posted by Jack T
Wow! I wonder how expensive.


Good question. Looks like they would be complicated to fabricate. They might also be fragile if making contact with the bottom or debris. Where would you get one fixed if you bend a blade?

Wondering if they would make models for the counter rotating stern drives (DP/B3)?

#572864 - 10/12/19 05:19 PM Re: New Propeller Design - Sharrow Engineering [Re: Dock Holiday]  
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kenhdog Offline
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Wow. Not just a placebo, measured effects.

Interesting.


2002 Rinker 212 Captiva
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1999 GMC 'Burb
#572870 - 10/13/19 07:44 AM Re: New Propeller Design - Sharrow Engineering [Re: Dock Holiday]  
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Silverbullet Offline
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Boise, ID
Originally Posted by Dock Holiday


Originally Posted by Jack T
Wow! I wonder how expensive.


Good question. Looks like they would be complicated to fabricate. They might also be fragile if making contact with the bottom or debris. Where would you get one fixed if you bend a blade?

Wondering if they would make models for the counter rotating stern drives (DP/B3)?


I had those same thoughts in the video that FR posted.


James
2002 Cobalt 226 VP 8.1GIDP
2007 Chevy 2500HD Crew Cab Duramax
1988 Suburban 3/4 Ton
2000 Subaru Forester


#572881 - 10/15/19 07:14 AM Re: New Propeller Design - Sharrow Engineering [Re: Dock Holiday]  
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Dave R Offline
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The dramatic increase in speed at idle has me interested. I often run at hull speed (8.5 knots on my boat) and if I could reach that speed without throttling up above idle (which is currently 6 knots), without over-propping the boat, that would save me a lot of fuel, probably enough to pay for the props in a couple of years, unless they are absurdly expensive.

Repair would have to be done at the factory until independent repair shops invest in the tools to repair these props.

I would think DP/B3 models would be planned for sure, those drives are really popular and it would make sense to offer an upgrade.

I hope these are the real deal, it would be really cool if there was a revolutionary improvement in prop efficiency.


"Mischief Managed II"
1992 Tollycraft 44 Cockpit Motor Yacht
Twin CAT 3208TA inboards
#572882 - 10/15/19 08:48 AM Re: New Propeller Design - Sharrow Engineering [Re: Dock Holiday]  
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captkevin Offline
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Very interesting. Will be interesting to see if they catch on or not. Not much really changes in props. Remember years ago they had shifting props but they didn't become popular. Cost could have been a factor but still would have thought the gains would have made it worth while.


2004 Rinker 232
2010 Dodge Ram Crew Cab Laramie 4x4
#572883 - 10/15/19 10:07 AM Re: New Propeller Design - Sharrow Engineering [Re: captkevin]  
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Dave R Offline
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Originally Posted by captkevin
Very interesting. Will be interesting to see if they catch on or not. Not much really changes in props. Remember years ago they had shifting props but they didn't become popular. Cost could have been a factor but still would have thought the gains would have made it worth while.



Word on the street was those Land and Sea shifting props were really hard to set up. There was also a short period in the late 80s or so when Mercruiser offered a two speed transmission option between the engine and the stern drive. If memory serves, it was basically the planetary gear set out of a GM Powerglide and a simple ring gear brake in a fairly thin (front to back) package. It did not catch on either.


"Mischief Managed II"
1992 Tollycraft 44 Cockpit Motor Yacht
Twin CAT 3208TA inboards
#572884 - 10/15/19 11:17 AM Re: New Propeller Design - Sharrow Engineering [Re: Dock Holiday]  
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Frantically Relaxing Offline
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Not much room in an outdrive for a CVT type setup either wink

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 wink -- 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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#572885 - 10/15/19 11:30 AM Re: New Propeller Design - Sharrow Engineering [Re: Dock Holiday]  
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Jack T Offline
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"Remember years ago they had shifting props but they didn't become popular. Cost could have been a factor but still would have thought the gains would have made it worth while."

Land & Sea Torque Shift props are on eBay.

Some of you may remember I had an Aerostar shifting propeller. Completely satisfied. Yes expensive but it worked! When it shifted, it was much like a Two-speed Chevy Power Glide transmission. Sold it to the owner of an under powered boat when we bought the Montery. I don't know if they are currently selling propellers, but they did help the buyer of my prop in 2012 to purchase a Mercruiser hub (mine was for OMC stringer mount).

Here's a prop comparison article from a 1997 issue of Popular Mechanics.
https://www.popularmechanics.com/adventure/outdoors/a5650/1276976/

Here's a link to Aerostar Marine
http://aerostarmarine.com/


Have a great day of boating
2012 Monterey 224 FS,
300 HP Volvo Penta with catalytic converters

#572898 - 10/20/19 09:26 AM Re: New Propeller Design - Sharrow Engineering [Re: Dock Holiday]  
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captkevin Offline
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2004 Rinker 232
2010 Dodge Ram Crew Cab Laramie 4x4
#572907 - 10/25/19 06:04 AM Re: New Propeller Design - Sharrow Engineering [Re: Dock Holiday]  
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WaterWing Offline
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Very interesting... revolutionary?


2001 Larson SEi-230 5.7 Merc/Alpha1
2013 Ford Explorer

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