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A double-screw boat is better with two smaller three-bladed propellers turning slightly faster. Propellers for nozzles should be square-tipped Kaplan designs. All propellers should be manufactured to ISO 484 Class 1 standards.
[http://www.vicprop.com Victoria Propeller Ltd. ] has an online calculator for propeller size for displacement and semi-displacement hulls. <ref>[http://www.vicprop.com/displacement_size_new.php</ref>online calculator for propeller size] for displacement and semi-displacement hulls.
== Controllable Pitch Propellers ==