RPM to MPH / KPH Calculate MPH and KPH from RPM, Gear Ratios and Tire Diameter - Large Animated Diagrams.
Batten Centers and Spacing Calculate Batten Centers, Spacing and End Batten Fit.
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Lay your phone or tablet on an angled surface (roof ?) to directly measure angles and automatically calculate Roofing and Pitch Angle Apps.
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