No other purchase will enhance the performance of the boat as dramatically and for as long as will a feathering propeller
Firstly: To enjoy faster sailing by practically eliminating drag. When the engine is turned off, the waterflow automatically rotates the blades into the feathered position. Drag almost vanishes and sailing speed increases by 15% to 20% depending on wind conditions. On longer trips you gain hours, even weeks or more. A further advantage is the elimination of propeller turbulence for a much enhanced rudder effect.
Secondly: To increase stopping power dramatically for stress free maneuvering and docking. When shifting into reverse, the leading blade edges turn 180 degrees. Reverse thrust is then equal to forward, 30% to 40% higher than with any fixed blade standard and most folding props. You can stop the boat on the proverbial dime, typically in less than a boat length.