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The selected boat propeller determines how well a boat shall perform. When choosing a boat propeller, there are some things you have to consider. You need to think of its size, number of blades, the material it is made out of, its RPM at the wide open throttle, and the use of the boat.
Of all these, you need to be most keen on the prop size. A wrong prop size means extensive damage to the boat and its engine system. You thus have to consider the boat prop’s diameter and pitch when measuring its size. Higher pitches are known to give a boat more speed. Its larger diameter means it will accelerate faster.
When it comes to blades, you shall find three to five ones. The higher blade count leads to better performance. The fewer the number of blades, the more top speed it can achieve. This is why racing boats go for three bladed props. They will also stick to cupped blades. Cupping points to the curve at the end of the blade that helps the boat make sharp turns. The rake of the blade is also a consideration here. The angle between the prop hub and blade is the rake. Its the purpose is to prevent slipping.
The material used in making the prop matters. Aluminum props are readily available and cheap. They are lightweight and tough. Their drawback is their inability to survive salty waters. You would need to go for stainless steel there. You will have to spend more on those blades though. They will also damage the engine system in case they hit an obstacle, unlike the safer aluminum variety. There are also composite and plastic props, which serve their purpose well in case of an emergency.
When choosing the ideal RPM rating, you need to look at what is recommended for the boat. You shall find this info in the manuals.
You need to also factor in the use of the boat in your selection. You shall find a wide variety of props, each serving a specific purpose. You shall find some designed for pontoons, bass boats, and skiing boats, those for fishing, racing, or relaxation. The kind of water the boat shall be traveling also matters. Some props are great for lakes, while others are ideal for rivers or slow-moving waters. Others are meant for the high seas. There are those for flat, heavy passenger boats. you thus have to select from those meant for the waters you frequent and boat type. It is wise to invest in an extra prop, for those times and emergency crops up.