Not sure on the diameter from memory but it's a 17 pitch. I'm hitting 42 mph, not sure what the max rpm would be if I went full advance, it did cut out around 6000 one time before I realized it. I just keep an eye on the rpm and try to keep it around 5700 to 5800. I'd like the raker but hate to buy if it ends up being too much pitch and can't return. Are there any places that let you try before you buy with props?

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