Bravo 1, Hydromotive, or revolution 4
#23
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Blade surface area. But I wouldn't be surprised that there are other small differences too. M+ props aren't even consistent diameter from one pitch to the next nor are they consistent (would linear be the right word?) stepping thru graduated pitch props.
Try the rev 4 like plow said. He knows.
Try the rev 4 like plow said. He knows.