The stock is 47mm diameter 1.4" pitch where as the M445 is 45mm dia and 1.4" pitch, X645: Total Pitch: 1.6x1.77=2.832" X447/3: Total Pitch: 1.4x1.85=2.590"
With 5S; Stock, M445, X645, X447/3 I had: 38.6, 42, 44.3 and 43.1 mph repectively.
With 5S; Stock, M445, X645, X447/3 I had: 38.6, 42, 44.3 and 43.1 mph repectively.
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