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#1
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i think you can get a 13.25 X 19, don't worry about the diamter too much, just use the pitch numbers to get you in the correct rpm( if you were running more hp at higher speeds it would be more of a concern), if you want to fine tune it you can change diameters, but I don't think you will gain enough to offset the price of propellers. Stay with the same brand of props while you're swapping them, I've seen measured pitches vary by manufactures by a wide margin
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#2
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Ok, that makes sense, stay with the same brand when swaping. I have worked through the fact that every inch of pitch is good for 200rpm's on a gas motor, but was not aware of how the change in diameter would work into the equation. I guess that i just won't get too excited about it, just monitor closely when I do the. At this point, I think it is going to have to happen next season.
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