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logarithmic spiral blade shape for centrifugal pump

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David Walden

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Sep 16, 2018, 6:14:37 PM9/16/18
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I am writing to ask if anyone could help me determine the center of a logarithmic spiral intersecting two concentric circles.
Given the radii of the concentric circles, say 5 inch and 6 inch and angles of intersection of the circles and the logarithmic spiral, say 15 deg and 20 deg, respectively, how would I go about finding the center of the spiral?

Thanks
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