How to Compare Boat Props

The correct propeller is important for the optimum performance of the boat. The size of the prop, the style of the propeller and the maximum horsepower that the boat propeller will give in water are points to consider when comparing boat propellers. The propeller must also meet the unique needs and desires of the boater. The propeller will have to match the RPM requirements specified by the manual of the boat engine.

The first consideration when comparing boat props is size (i.e. diameter of the prop). The diameter and pitch should suit the needs of the boat and the configuration of the boat engine. The pitch should give optimum performance for the RPM of the propeller. Some boats may require a large diameter and low pitch while others may require a high pitch but a small diameter. After ascertaining the size requirements, boaters can select among the different props available for the configuration.

The number of blades of the prop is a second consideration. Four blade props give better performance fuel economy, better lift for the boat and grip on water. They give better speed for large boats on slow water. Three blade props give better top end speed and they are the ideal props for racing. If the use of the boat changes and an upgrade is required from a three to a four blade prop, the four blade prop should be purchased at the same cost.

The material out of which the prop is made is the next most important factor. Most props are made of either stainless steel or aluminum. Stainless steel gives good performance and is non corrosive. The only drawback is that when stainless steel props collide with an obstacle, the jolt resonates and damages the motor. Aluminum is lightweight and corrodes in salt water. When an aluminum prop hits an obstacle it breaks but prevents damage to the engine. Composite props give good performance and are inexpensive.

The engine of the boat is an important consideration. The prop should be purchased to suit the manufacture of the engine, the horsepower of the engine, the model and the year when the engine was made. The manual of the engine is a good guide for comparing props.

The price is an important factor in purchasing a prop. Good props are available at discount rates. The internet has many websites which offer discounted props. All types of props are available at affordable rates for all types of engines. The propeller should give optimum performance. An expensive prop is not necessarily the best propeller.

If the boater is looking for a spare emergency prop, weight should be considered. Aluminum props weigh much less than stainless steel props. Plastic props have become popular as emergency props. However, aluminum props can be repaired while plastic props cannot be repaired if they break during a collision.

The type of boat is a factor to consider. Fishing boats, cruisers, pontoons and other boats used on slow water may require a different type of prop while speed boats and boats that ply on the high seas require a different type of prop.