I was told that each inch of prop either increase or decrease = 200rpms. I am no prop expert but Julie at Throttle Up is. I would contact her to be certain but that is what she told me. They are great at what they do there.
Just an FYI a Mirage Plus provides more bow lift than a Bravo.23concept said:My info came from using a Mirage Plus, but appears to not be correct. I will have more info when I go through my prop switching, that what just what I was told. I am leaning towards a Bravo 4 blade hoping for some bowlift. I have none with my current 25 Mirage Plus.