Prop Calculators Enter four variables and this prop calculator will provide the fifth variable.
		Engine RPM Gear Ratio Propeller Pitch   Propeller Slip Speed MPH	You must have a browser capable of running JAVA to use this calculator. Almost all versions of Internet Explorer and Netscape have this capability. You may need to enable it (allow it to run) in some browsers. When entering data, you can either click on the appropriate cell, or you can "tab" between the cells. Units Engine RPM = rev/min Prop Pitch = inches/rev (add 1 inch for cupped props) Prop slip may be entered as either decimal or integer values (.15 or 15). Prop slip may be entered as either decimal or integer values (.15 or 15). Speed = Miles/hour Obtain speed data from a radar gun or GPS if possible, boat speedometers are inaccurate.