Feb 12
6
Boat Propellers: Energy Efficiency Considerations
Boaters interested in purchasing Johnson boat props may be eager to learn about the ways in which propeller characteristics and a boat’s operator can influence the energy efficiency – and fuel consumption – of a marine propulsion system. In the typical small boat, not all of the energy generated by the motor ends up reaching the propeller. In fact, only about 30% of the generated energy makes it to the propeller.
The energy not directed into Johnson boat propellers goes to a variety of other uses, such as counteracting the resistance of wave motion, overcoming the friction atop the surface of the water, and minimizing resistance emanating from the boat’s wake.
When it comes to Johnson boat propellers, two major factors control how much energy is wasted as the propeller turns. The boat operator can control the first factor only at the time of purchase. This is because propeller design itself can have a large influence on fuel efficiency. Operators need to make sure that the propeller they choose is appropriate for the motor that it needs to work with, as well as appropriate for the type of boating activity the owner has in mind.
The second major factor that influences energy efficiency for propellers is an ongoing rather than a one-time concern. The way in which a boat operator uses the propulsion system can add to or detract from fuel efficiencies, as can issues such as proper maintenance of the hull.