Propeller Slip Calculator
Free calculate propeller slip percentage from theoretical speed and actual speed. determine propeller efficiency.
Input Parameters
inches
Results
Enter parameters to calculate slip
Propeller Slip Formula
Theoretical Speed
V_theory = (Pitch × RPM) / (Gear Ratio × 1215.224)
For knots (1215.224 converts in/min to knots)
Slip Percentage
Slip = ((V_theory - V_actual) / V_theory) × 100%
Typical: 10-20% for planing boats, 20-30% for displacement boats