MarineLink has a report on a new propeller design claimed to be “9-15 percent more efficient than the industry standard Wageningen B-series design” It is also claimed that new design can be “manufactured to meet a comparable price point to standard propellers.”
“Sharrow’s propeller product provides a wider peak efficiency curve for greater utility over a wide scope of operational ranges, and a 17 percent reduction in torque while accelerating. “
Fuel is a major part of Coast Guard operating costs. That degree of increased efficiency would make a huge difference in fuel economy. .
Looks like each blade consist of two parts connected at root and tip, with a gap in between. Visualizing the fluid flow over the blades is quite intriguing. I presume the gap allows accelerated flow over the forward face of the following blade half and that the joined tip prevents some loss of efficiency by decreasing span wise flow on the underside of the leading blade half and on the upper surface of the following blade half.
Could these be applied to the same effect to Variable Pitch propellers?
Makes me wonder if a similar design might not work on an airplane as well, both as a propeller and perhaps as a wing.