Another consideration when using a stainless prop is it can result in a damaged or broken drive shaft if you hit a submerged rock or stump. Not to say this can't happen with an aluminum prop but a lot of folks think the likelihood increases with a stainless prop.
This is a big reason why composites are becoming more popular.
That's what I've heard also, that a SS prop is so tough, it's the engine that suffers, and not the prop, and that the aluminum ones break the prop rather than damage the engine.
Many Stainless Props now have a hard plastic center hub designed to break before any lower unit damage would result. Though I have a big fan of the Propulse props and the advantages of such and I still use mine from time to time... My 3 bladed Stainless prop will eat it for lunch (as expected) in both launch and top end speed.
This should also equate (though I have not tested such yet) to better range at my best cruise RPM of 4000 RPM thus saving me fuel (money) in the long run. A couple of tanks of fuel running it though, and the fuel burn spread I posted here should tell me if my theory is correct or not
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