Interesting Propeller

[Russ]

Have you seen this before? Looks very interesting.
They don't currently make one for less than 150hp and they are a bit spendy ($5,000).
https://www.sharrowmarine.com/





Video

[kmclemore]

Yeah, I’d seen that too, Russ. But when you work out the cost vs any savings or extra power, it’s still a poor deal. But it sure is purdy!

[OverEasy]

Hi Russ!

Really interesting prop and presentation!
The efficiency and performance aspects are impressive!
There are a lot of very positive aspects in this uniqueprop design!
And yes, it sure is Purdy!
Thank you for sharing this!

Setting the cost aspect aside for a moment, there are a lot of nice features and performance to like about this novel prop design. While it w
Is currently marketed to a higher HP and Price Point crowd the design would still translate well down into the lower HP ranges, especially the 50 to 70 HP engines often found on Mac26X and M boats.

While the current models are Stainless Steel (which would help with the increased stresses imposed by high HP engines) it might be possible to make an aluminum version via investment or lost wax casting processes for the lower HP applications which could bring the prices down. A larger market of lower HP engines would also help with bringing down the purchase cost.

Getting a 1/3 or more improvement on available range isn’t small potatoes!

Again, Thanks for sharing this item!

Best Regards
Over Easy

[kurz]

Give me this prop

[Russ]

At $5,000 a prop, this prices it out of many captains.

The most interesting aspect was how quiet it made the engine.

It would be nice if this thing took off and they could increase production to reduce the price to reasonable. Or as OE states, maybe manufacture an aluminum version.

[kurz]

At $5,000 a prop, this prices it out of many captains.

The most interesting aspect was how quiet it made the engine.

It would be nice if this thing took off and they could increase production to reduce the price to reasonable. Or as OE states, maybe manufacture an aluminum version.

well, don't think it was the problem with the price for the first one... But you would buy a second... third one... becouse the others was stolen...

[OverEasy]

Anybody got a 3D Laser Metal Printer around that needs a project?
Printing one scaled for a 50 or 60 hp class outboard out of steel or aluminum for evaluation purposes (only) would make an interesting project. Getting it galvanized as a DIY really isn’t that hard either (with some simple reasonable precautions).

[Russ]

Nice point. Anyone have one and where are they located?

well, don't think it was the problem with the price for the first one... But you would buy a second... third one... becouse the others was stolen...

That would be an easy part to steal. Regular props get stolen easily.

[OverEasy]

Hi All!

This “Interesting Propeller” design approach also has application in moving air as in for drones and potentially in the future for aircraft.
Seems the genesis of the toroidal propellor was actually in current history developed for drones to quiet them down.
The link is below:
https://newatlas.com/aircraft/toroidal- ... ropellers/

Best Regards
Over Easy

[Russ]

OE, interesting link. This design offers a significant sound reduction for aircraft and drones as well.