Finding Parallels Between Propellers and Life
Dec 23, 2017 // By:admin // No Comment
Usually, boating aficionados do not consider how important the role of their boat propeller is. The propeller is the direct connection between the horsepower and the water. Therefore, when shopping for a propeller for your boat, make sure you make all the necessary considerations.
Finding the Right Shape and Size
Propellers can be purchased in an entire range of shapes and sizes. When it comes to sizes, measurements are taken in terms of diameter and pitch. First off, be sure that the propeller pitch fits the engine manufacturers recommended WOT (wide open throttle) range. This means it should be possible for the throttle to be fully advanced when you turn the minimum rpm for which the engine was created. An increase in a propellers pitch leads to a bigger weight or limit for the engine to drive up to greater rpm’s. A 750-horsepower offshore race engine can turn more than 30 inches of pitch, but a 50-horsepower engine can only be successful turning 15.
Checking the Diameter
Diameter is another measurement that impacts rpm capabilities as well as other boat and hull personalities. Plenty of of the diameter options have been preset for the consumer by the propeller manufacturer. This can work great in most low-high performance applications. However, fine tuning diameter can improve general performance in drastic ways. Reducing diameter will often lower rpm, and the same is true the other way around. Changes in diameter will adjust the running attitude of the hulls as well. Changing the diameter is not always needed though as the stock diameters may be matched to different propeller types.
How Many Blades
In theory, less blades create faster speeds. This is based on the fact that more blades cause more metal in the water, thus more drag. However, if you have an inefficiently running boat, more blades can give the boat more capability to “hook up” and improve its performance thoughout the torque band. The boat’s specific application will partly dictate the number of blades needed for optimal results.
Selecting the right propeller for your boat propeller does get intimidating sometimes. Seeking the help of a trained professional is the best way to optimize your boat set-up. Most are happy to help by sharing their expertise. You don’t even have to meet them in person. Simply take part in online forums and you’ll get a lot of insights.
Finally, the most vital starting point is knowing your engine or engines capabilities. When you’ve got this out of the way, you can be sure that the engine package is protected from propping-related improve rpm. From here, you can decide if you want to take it to the next level of performance.