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November 12, 2019

Choosing a Propeller – The right prop maximizes performance

The recent flurry of new outboards is giving anglers even more choices when rigging a new boat or repowering an existing one. While hull shape, weight distribution, engine mounting height, and often accessories like a jack plate play a role in the boat’s performance, nothing is more important than the right propeller for wringing every bit of horsepower out of a motor and achieving the desired ride. Outboard manufacturers realize this and—along with launching faster, more efficient and technologically advanced motors—are producing new prop options as well….. Sharrow Engineering’s rotary props are perhaps the most intriguing propeller development. They haven’t hit the recreational outboard market just yet, but extensive testing has shown appreciable performance characteristics. They’ve been in the works for seven years and are built using computer-­assisted design and 3D additive technology, and their design evolved from super-quiet drone blades developed for the military and other applications. The Sharrow props will be built in a range of sizes, with universal hubs. “Because of the way the blade elements are connected via the outermost region of the loop, and the fact that our ‘tip’ section doesn’t get as thin as a conventional propeller, the entire structure is stronger, more rigid, and less prone to failure,” CEO Greg Sharrow explains. “Typically, the Sharrow propeller produces a more uniform downstream thrust field as a result of reduced tip vortex losses, less cavitation, and more balanced blade loading. This results in a smoother ride, more responsive steering, and better fuel economy overall from low-end to top-end speeds.”

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