The size of a propeller and the horsepower of an engine are the two main factors that affect the choice of the right boat inboard propeller. These two ensure optimum boat performance and the fuel efficiency of the engine. Other important factors include size, pitch, the number of blades and the material from which the propeller is made.
Diameter and pitch of the propeller need to be considered. The diameter is the circle made when the propeller makes a rotation. The pitch is the distance the boat shall be pushed forward by a single rotation of the propeller. The pitch is what determines how much momentum the boat shall have. You need to follow the guide the boat’s manufacturer has provided when you want to know which diameter and pitch are good for you boat. Boats which have no such specifications can till be fitted with the right ones when you consult a motorboat dealership. You can visit PropellerDepot.com for more options about the best boat propellers.
You need to also think of the number of blades. The most common ones have either three or four blades. The four blade propellers make for faster rides, with quick acceleration, faster planing, higher transom height, less spillage and better holding power. The three-bladed propeller allows for better top end speed, which is good for racing or speed boating. Three blade propellers can function as four-blade propellers when you reduce an inch of the pitch. The cupping of the blade needs also to be looked at. As is the thickness of the blade. Cupping refers to the curve at the edge of the blade. The deeper the cup, the more grip there shall be on the water. When it comes to the thickness, a thinner blade will have less drag, but a thinker one is stronger.
Your choice of a propeller will also depend on how the boat is used. Different propellers suit different uses. You need to know if it is a slow boat, a speedboat, a towboat, or a fishing boat. Whenever you change the functions of the boat, you also need to change the propeller you had installed.
The material that makes up the propeller should be durable and non-corrosive. Aluminum is ideal for freshwater lakes. It could, however, corrode in high seas. Stainless steel is the better option there. It also lasts longer but costs more. Composite props are also becoming common, since they can be used in any water, and are not as expensive as stainless steel. Check this video https://www.youtube.com/watch?v=rpwpkQwfO3g if you want to learn more.
You also have to look at the brand of the propeller you are buying. It should fit all types of engines. The brands that are well known usually give better performance. They also have warranties. You can find some with lifetime blade and hub warranties. Those work better for longer.