onesickpantera

What affect does prop diameter have? I know a bigger diameter will lower rpm but does it/can it make the prop more efficient?

bbladesprops

Yes it can make it more efficiant. More diameter can be great if the boat can handle it.

onesickpantera

And what determines if a boat can handle it? Are there handling characteristics as well?

The reason I ask is my Viper 23 is still the best prop I have tried but I running more rpms than I would like to(52-5300)

I want to try a Mirage + but I don't think my boat will pull a 25. But I noticed a M+ 23 is a 14.625" prop compared to my viper which is a 14.25". So, if the M+ will lower my rpm AND be more efficient it may work. Does that make sense?

throttleup

Yes, the Mirage plus is a larger diameter so this will effect your RPM. Additioanlly stepping up to a 25P, from your 23P will decrease your RPM in itself, about 400 RPM without the diameter in the equation.

Julie

onesickpantera

Julie, I don't think my boat will spool a 25. I am thinking about trying a 23 pitch M+. So, my question is both being 23s, how much rpm difference will I see between the M+(14.625") and the Viper(14.25)? Any difference in handling.

And the more important question, will the M+ be more efficient. Right now I am running about 11% slip, but I am not trimmed out as high as I would like to be because I am already at 52-5300 rpm. I was at 8% slip (before the motor swap) trimmed out properly.