SS props are hand formed. In order to get it accurate, you have it professionally worked (Holland Propeller, Holland, MI for example). The latest CNC props come that way from the factory. There is no performance gain from a CNC to a SS, the opposite is often, but not always, true. Back in the day, SS props increased performance due to the thinner blade. That has been erased by the CNC and new NiBrAl alloys that allow for a much thinner profile. My guess is that a properly matched CNC prop would perform better than a generic SS prop.
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