Sharrow's Prop Forsakes Solid Blade Design in Favor of Open Spirals
A company called Sharrow Engineering of Philadelphia has brought to market what is being hailed as the first major breakthrough in propeller technology since the 1930s. The company, the brainchild of engineer Gregory Sharrow, was founded in 2012 to "reinvent the methodologies and technologies used for propulsion in the 21st century."
As you can see from the images above, Sharrow has forsaken traditional solid blade design in favor of an open spiral concept. The company and those who have tested the prop say this has eliminated the most common problems with rotary propulsion such as creation of vortices and cavitation at the tips of the blades.
The downside: They're very expensive at the moment.
In September 2019, BoatTEST.com conducted a four-day review of the of the Sharrow propeller and compared the performance to industry standard stainless-steel blades. Read the full Captains Report. Results from the BoatTEST review prove that the Sharrow propeller has the following advantages over traditional bladed props:
1. Performs significantly better at idle
2. Planes at a lower RPM
3. Is faster at all RPM settings
4. Gets significantly more mpg at 3000 and 3500 RPM
5. Is more fuel efficient at every speed through water setting
6. Is as much as 18% more fuel efficient at 26-28 MPH
7. Produces the highest top speed
8. Creates noticeably less vibration
9. Is generally quieter
10. Has superior handling in tight turns at high-speed
11. Improves handling in reverse
12. Provides the greatest range at all speeds