8 Myths of Propeller Performance

If you’re looking to get a boat, you’ll have its propeller in mind. As such, you’ll most likely be reading through various manufacturer’s guide.

However, the thing is that these manufacturers have not been entirely open. Usually, most information you’ll come across about propeller performance are quite misleading.

Are you wondering what they are? Don’t worry, we’ve got you covered. So, you can have the right information, here are 8 myths of propeller performance.

Myth 1: You Can Adjust A Semi-Custom or Standard Propeller to Fit Any Boat

Generally, most propeller manufacturers present the opinion that you can modify or adjust their propellers to fit any boat. However, this isn’t the case.

Most propellers have limited change options such as in partial pitch or diameter. And as such, an attempt to make them for general use would limit a holistic design and prevent optimum performance.

Myth 2: Balancing a Propeller Improves Smoothness

You’ll most likely hear that balancing your propeller improves the smoothness of your propeller. However, this isn’t the case.

Usually, handmade and computer designed propellers are not free from geometric inaccuracies. As such, all balancing does is help the propeller’s mass.

Myth 3: Balancing a Propeller Stop Vibration

Again, some state balancing a propeller stops vibration. Once again, this is not the case.

Generally, balancing addresses the mass and not the inherent inaccuracies. As such, the blade geometry remains inaccurate and will continue to vibrate.

Myth 4: All Computer Controlled Cutting (CNC) Machine Propellers Are Similar

Also, you’ll most likely find opinions that all CNC machined propellers are similar. Well, this isn’t the case.

Generally, CNC machine propellers can either be fully computerised or partially computerised. And in the case of the former, the computer performs all the functions in the production process. In the case of the latter, manual adjustments come in.

Myth 5: All Computer Controlled Cutting (CNC) Machine Propellers Have the Same Accuracy

Also, you’ll most likely find opinions that all CNC machined propellers have the same accuracy. Unfortunately, this isn’t the case.

Generally, only fully computerised machining provides perfection and ultimate performance. In cases of manual adjustment, there’s a limit to precision and accuracy.

Myth 6: You Can Move A Propeller Physically to Change the Pitch

Another popular myth is that you can easily modify the pitch. Well, this is far from the fact.

Generally, the design and installation of every propeller require a full balance of secondary and primary geometry. There’s the need to consider the rake, skew, and blade area, among others. As such, trying to get this done physically will ruin your propeller’s geometry.

Myth 7: You Can Use an Identical Propeller Replacement from Any Propeller Manufacturer

You’ll hear that you can easily replace your current propeller with an identical one. Well, it’s far from the fact.

Errors characterise the production process of propellers. And as such, each propeller is a one-off that’s hard to replace. Even more, trying to force a replacement might damage the propeller’s performance.

Myth 8: Manual Production Provides Precision 

In case you come across this, it’s more of a tale than fact. Generally, manual production is more prone to error than the automated means. As such, you’ll stand a better chance with CNC.


Regardless of these difficulties, at E-cycle Marine, we offer full CNC machining that ensures we meet your needs to spec. This way, you can get past these 8 myths of propeller performance.

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