Originally Posted by Steve H
Then why did he lose RPMs with a lower pitch prop until he overtrimed it?
Stainless will always out perform aluminum. I know they are more expensive, but on this particular application a SS prop is the way to go.
You may have misunderstood my post, and possibly the OP’s, but it’s a bit difficult to understand exactly what he’s saying.
Just switching to SS doesn’t mean you get better performance, you need to dial in the prop get that performance gain, which may mean using several different SS props with different designs to see which works best, and the gain is frequently not huge. So if a boat/motor combo has the correct aluminum prop already, just switching to a similar SS prop may yield no gain, or maybe even result in a loss in performance. In this case it appears he has the wrong SS prop on the boat, at least for the way it’s currently set up, so using the correct aluminum prop would possibly (most likely) yield better performance than the current SS model. I didn't intend to say that an aluminum prop is as good, or better than SS, only that the correct aluminum prop is better than the wrong SS prop.
I don’t think he meant that he over trimmed it, just that trimming it up increased RPMs, he didn’t say whether the increase in RPM’s resulted in a higher top speed though. He also asked if continuing to trim it up would cause it to lose its bite and over rev.