The same goes for fuel and water when we’re not traveling long distances. There’s no need to carry extra refrigerators or spare anchors with many meters of chain when we will not need them. Remove everything you don’t need and load only what is necessary for each trip. The heavier the load, the more the fuel is burned and most people bring aboard more than they need. This is why we must be particularly careful of the load and where it’s placed.Įxtra load increases the wetted surfaces of the hull resulting to greater drag and fuel consumption. Weight distribution can have a large impact on fuel consumption. Specifically, tip cavitation and vortices have been eliminated or significantly reduced, providing as much as 30% more efficient between 2500-4000 rpm.Ī heavy load and unbalanced weight distribution are the enemy of the centre of gravity and the correct attitude of a boat. Its design has solved the most basic problem of rotary propulsion.
The Sharrow Propeller is the first major advancement in propeller technology since the 1830s. The exception is when we’re carrying heavier loads. A three-blade propeller usually delivers better fuel consumption than a four-blade of the same diameter because the extra blade creates drag. The reduction of the fuel consumption at medium rpm is noticeable when we increase the pitch of our propeller by 2” (5.08 cm).īeware, we must not fall into the trap of increasing the propeller pitch to the point sacrificing the boat’s performance at low rpm or the proper operation of our engine.Ĭhoose a three-blade propeller instead of a four-blade in the same diameter. Our engine’s rpm will drop but they will still remain near the middle of its maximum rpm range. This increases our cruising speed at the midrange rpm while reducing fuel consumption. We can switch to a 21” (53.34 cm) Rev 4, especially if we want to cover a large distance. Suppose that the maximum rpm range of our engine is between 57 rpm and the propeller we have matched is the Revolution 4 19″ (48.26 cm) pitch that allows our engine to reach 6300 rpm.
INBOARD OUTBOARD VS OUTBOARD FUEL ECONOMY PLUS
An example is the lower fuel consumptions of the Eco Enertia compared to the Tempest Plus, the Mirage Plus or the Revolution 4 propeller, all of which are made my Mercury Marine.Ī higher pitch propeller of the same model should achieve greater fuel economy at mid-range rpm. Looking at data accumulated in our many tests, a larger-diameter propeller can achieve 30% lower fuel consumption than a smaller one. When stepping up in diameter, we need to reduce pitch to retain the same engine rpm. A larger-diameter propeller generally gets better fuel economy at low and medium rpm than a smaller wheel because the bigger one slips less. But don’t forget that the propeller must let the engine to reach at least until the middle of the maximum rpm range recommended by the manufacturer. Matching the correct propeller to the boat can improve fuel economy. To replace an inboard/outboard motor would be much more costly.One of the major factors that affects the overall performance of our boat-engine combination and its fuel consumption is the propeller.
That’s why all of NauticStar’s Deck Boats are factory installed with high performance Yamaha outboard motors. Inboard/Outboard Stern Drive Posted on MaJby NAUTICSTAR BOATSįour-stroke outboard motors are becoming increasingly popular over inboard/outboard stern drive motors on pleasure and ski boats for a variety of reasons.
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