​HENLEYS use the latest calculation software coupled with our experience of over 100 years of propeller design, manufacture and repair to provide the most accurate results when supplied with accurate input data.

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Where possible please ensure you conduct a sea trial and complete the relevant section of the form. This provides our programs with an accurate datum point for the hull efficiency and greatly improves the calculation accuracy. 

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For more accurate speed estimates, you can supply hull resistance data which can be superimposed over the propeller dynamic thrust curves.

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Please note that standard calculations have a fee to cover Henleys time for these calculations, pricing is listed on the forms.

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Henleys cannot provide any guarantee on calculation results including performance and sizing. This is because there are too many variables at play including the accuracy of the data supplied.