Diameter is calculated to closest eighth inch.
Pitch is calculated to closest quarter inch.
An alternate propeller size will appear in the alternate column only if the optimum propeller size exceeds the allowable space. While the alternate propeller is suitable, the efficiency of the alternate propeller is likely to be significantly less than the efficiency of the optimum recommended propeller. Consult with your propeller dealer for the proper left hand or right hand rotation. HP is approximate values of propeller hp and should be used for comparison purposes only. In addition, the propeller hp is total hp required by the propeller for the conditions given and no inferences or assumptions should be made regarding efficiency.