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Sometimes prop numbers are under the prop nut.
There is an involved procedure here somewhere to figure prop pitch.
But you would have to remove the prop. I can be a little thick so it was all confusion to me.I'd rather drive 50 miles to a prop shop than try to figure it out.If you can give us your boat/motor info and your present max rpm and speed we may be able to at least tell if your performance seems normal for the setup.
If there is no # stamped on the prop then you need to take it to a shop and have it gauged. Its the only sure way. The formula that was on here has been removed for further study.
