Really, really fast. There are some WMA's in Arkansas that have hp restrictions to 25 or less. A small army of Arkansas hunters have modified 25's that are running north of 30 mph. Some are running far north of 30.
The reality of it is, selecting a prop is pretty difficult if you don't know your engine's RPM's. If you don't have a tach, a Tiny-Tach is a small investment that will tell you engine RPM's as well as operating hours. It will also help with oil changes. I mounted mine on my tiller arm.
Once you've determined your engine RPM's, you'll want a prop that gets you to your max rpm's with a normal traveling load. I really like the folks down at Power Tech in Louisiana. Give them a call with basic RPM information and they can walk you through prop selection. I like a stainless prop.


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