damaged my prop and forgot to save size

[stylesabu]

I have a 2000 Lund pro v 1775 with a 150hp johnson 2 stroke on it. normal load 400 lbs humans,20 gallon gasapprox 160 lbs another 150 in gear and cooler. I think the old prop was 20 by 14 1/2 stainless steel does that sound about right?

 

[etracer68]

Re: damaged my prop and forgot to save size

Most likely it was 14 1/2 diameter, and 20 pitch. Do you remember your WOT rpms, and gps mph.

 

[stylesabu]

Re: damaged my prop and forgot to save size

I want to say 5400 rpm and about 55 mph

 

[steelespike]

Re: damaged my prop and forgot to save size

Using 6% slip the prop calculator comes up with a 21" prop.We have to keep in mind that rpm and speed is
best recollection on your part and 6% slip is a guess on my part.Is your speed by gps?
Further research on similar boats,not Lund, with a 150 Evinrude Etec ,same gear ratio,prop sizes were in the teens.

 

[stylesabu]

Re: damaged my prop and forgot to save size

i have other props, 19" that are aluminum and I have A pirahna compostion that i haven't used yet, but boat was fastest with ss 21". and yes I was using GPS

 

[steelespike]

Re: damaged my prop and forgot to save size

Not sure where you want to go from here.
I think the best choice would be to test the 3 props and get us the results along with
any performance changes you think you need.
It would appear you may have been running a 20 for some reason perhaps because of a short coming of the ss21.