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Topic: Re: Calculate "downward force" on an impeller

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The axial force on an impeller can be calculated from the horizontal force [lbs] = torque (63025 x horsepower/rpm) divided by 85% of the impeller diameter [inches] (typical equivalent load point on the blade). Then, resolving the horizontal force to the axial direction by dividing by the tangent of the blade angle with respect to the horizontal.