Re: Stainless v/s Aluminum
Stainless steel is a much stronger material than aluminium which enables the propeller to be manufactured with a thinner blade section. If the leading edge is thinner less air bubbles will be formed on impact and thus cavitation is reduced. A thinner blade is much more efficient that a thicker one. Aluminum will also flex a bit under load, wheras the SS will not much.
Hundereds of dollars difference between Alum and SS. To gain maybe 3% performance improvement, your call...