On Thu, 31 Jul 2014 10:07:44 -0700 (PDT), Tim
wrote:

Now that you mention it, the steel does have a better pitch to it . I suppose that's to get a better "screw" effect with less rpm?

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I think that because steel is stronger than aluminun, they can build a
prop with thinner blades that have less friction when turning through
the water.