In addition to greater efficiency, the Sharrow Propeller’s design is said to yield a stronger and more rigid form factor than traditional wheels offer. “We’ve hit logs, rocks, weeds, debris, sandbars—we even hit a buoy once—and we’ve never damaged the prop or lower unit other than cosmetic scratches,” says CEO Greg Sharrow. The props are available in diameters from 25 to 98 inches for inboard drives. Outboard props are expected soon. And while any propeller can tangle with lobster pots, Sharrow Propellers are compatible with shaft cutters.