Radical New Propeller Design... Sharrow?

I would happily extend the use of my vessel for Sharrow testing.
With me at the helm, of course.
46 ft, 48000 lbs, inboards.
Think they'd be interested ?

I do operate in the PNW. Despite my best efforts, I too have "touched" subsurface wood, which barely and briefly surfaced in my wake! You raise a good point, I'm also wondering about repairability. It's a complex design. It's early days in my due diligence, so we'll see.

The vibration is very slight, but I am a perfectionist. I doubt anyone else would think anything out of the ordinary is occurring. Have had assistance from experts very familiar with the build and power train, hence the work that's been done thus far. So, I think I'm good, thanks.

Props likely the only remaining component to check. I've just had them tuned (after recently hitting something submerged) but haven't yet had an opportunity to sea trial them. Problem may be solved.

I

Bingo..
Me too, I have taken boats apart to chase down vibrations and have had props tuned over and over again to get the best efficiency and the least vibration.
Glad I am not the only one..

"Very slight" is of course a bit subjective, but FWIW I've yet to come across any powerboat which I would describe as having no very slight vibrations at all.
Even with the engines off and only the genset running!

I'd really like to know how you arrived at this conclusion? Toroidal propellers virtually eliminate tip vortices, thus reducing interactions between blade tips and adjacent surfaces…

There's a video of Greg Sharrow speaking at the NMPA convention in November 2022. More tip vortices video and some graphs of test data:



If the content can be taken at face value , the Sharrow prop performance comparison he described was a fair one.

Regarding repairs, I noticed this:

Any Sharrow prop that is damaged “during normal operational use” in the first year of ownership, will be repaired or replaced by Sharrow Marine at no cost to the owner. This is part of the “Sharrow Care Protection Plan,” another thing that sets Sharrow Marine apart from any other prop maker. According to the company, if you accidentally run aground and damage a Sharrow prop, it will be repaired by a certified repair shop or replaced by Sharrow Marine. Customers can even extend their Sharrow Care Protection Plan beyond the first year, for up to 5 years of protection.

I turned a friend of mine on to these props and he put them on the 42’ Freeman with quad Mercs he has as a tender.

So far he’s very pleased with the results and they perform as advertised.

I am also impressed with the performance, the technology and especially the noise level going down.
I would buy a $5k prop, but Mama should not know about it, she has no understanding of the finer things in life.

They seem to be making progress on Inboard Applications in partnership with Veem, using their own 64 Viking SF test mule:

Sharrow and VEEM Reach Milestone in Performance Testing Results for In – Sharrow Marine

Sounds promising. Curious though why they didn’t state any actual testing specifics or improvement numbers?

They are keeping it close to the vest, as each application will be specific and there probably won't be an off the shelf solutions for a number of years. Lower vibrations (especially at trolling speeds) and more maneuverability may be a SF dream solution.

From Veem:

"The rollout of these will initially be carefully managed to ensure we are getting all aspects of the design and manufacture right, which will ensure the ongoing optimization of the design database,” said Mark Miocevich, VEEM Managing Director."