The kind of propeller you choose matters in the boat’s performance. There are a few things that govern your propeller choice. These are 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.
The prop size emerges as the most important consideration. Choosing the wrong size often leads to a damaged boat and engine. 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.
The number of blades also varies, between three to five blades. A higher blade count means the boat shall manage even better performance. Lesser blade numbers have been known to lead to the highest top speed. This is why racing boats go for three bladed props. Cupped blades are even more preferred. Cupping refers to the curve at the end of the blade, which essentially helps it turn sharper. There is also the rake of the blade to think of. 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 makes for cheap props that are easy to find. They are strong and lightweight. They are however not good for use in salty water. Stainless steel props are the better option there. Those are not as cheap. They will also damage the engine system in case they hit an obstacle, unlike the safer aluminum variety. You may also come across composite and plastic props, which are useful 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. There is no limit to the variety of props out there, each meant for a specific purpose. There are those meant for pontoons, bass boats, and skiing boats, those for fishing, racing, or relaxation. The kind of water the boat shall be traveling also matters. There are props designed for lakes, others for rivers, and others yet for slow-moving waters. Others are meant for the high seas. There are those for flat, heavy passenger boats. This means that your choosing has to consider such differences. It is wise to invest in an extra prop, for those times and emergency crops up.