A Guide to Boat Propellers
A propeller is a mechanical device which pushes or propels boats through the water. A boat propeller consists of shafts which revolve, that are typically powered by motors, and also blades that are responsible for gripping or biting into the water. Props are categorized with the amount and style of blades being used, diameter and measurement of pitch, as well as materials they are made from. For an overall best performance of boat engine, one needs an exactly right propeller. In case you change or want to change how you use your boats or boat engine, you will have to change the propellers too. It is important to note and be known to some of the basic boat propeller terms. Visit www.propellerdepot.com for more information.
Cavitation. This is one of the effects experienced by a propeller. Excess loads on propellers create vapor bubbles on the blade surface. This makes the propeller to lose its grips underwater, and it revolves at an excessive speed. Underwater disturbance such as barnacle on engine's lower gearcase, on the forefront of the propeller, can also cause cavitation.
Rake. The aft-leaning angle at the hub and the blade are called the rake. To overcome an increased tendency on or towards ventilation and cavitation, high rake angles are used on performance boats.
Ventilation. This is more or less a condition similar to cavitation. However, it usually involves drawn air down from the surface. May also come about through having the engine mounted higher on the transom or out trim of the engine. Exhaust gases are drawn into the area of the blades but happen only occasionally. Check PropellerDepot.com for better options in choosing the best propellers.
The thickness of the blade. Propeller design and material used most determine the thickness of the blade. To reduce drag, blades are designed as thin as possible but also thick for strength during revolution under water.
There are three types of boat propellers. These are:
Cupped blades. This is an integration of four-blade and three-blade propellers. It has curved lips that allow for better grip in the water. The cupped blades propeller increases the overall speed of a boat.
Three-Blade Propeller. It's the fastest and commonly used type of propeller. It has a holeshot, which is the propeller's three curved blades spiral around the central device. These curves improve the propeller's traction, or the grip and bite in the water.
Four-Blade Propeller. This propeller allows the boat to stay on plane when the engine runs at low levels of rotations in a minute. This makes it better than the three-bladed counterpart especially at keeping a steady or even cruising speed. You want to go trolling; this is the best propeller to use. If you want to learn more, check this video: https://www.youtube.com/watch?v=esQqJNIXLOc.