Propeller Steek & Slipberekening ⚙️
Bereken het slippercentage en cavitatierisico. Voer steek, diameter, RPM en overbrengingsverhouding in.
Hoe de Propeller Calculator te gebruiken
Voer propellersteek (inch), diameter, motor-RPM, overbrengingsverhouding en werkelijke GPS-snelheid in.
Slip van 5–15% is normaal. Boven 25% wijst op mogelijke vervuiling van de romp of beschadiging van de propeller.
Cavitatierisico is gebaseerd op bladpuntsnelheid (π×D×as-RPM/12). Onder 9.000 ft/min is veilig.
FAQ
What is propeller slip and how is it calculated?
Propeller slip is the difference between theoretical speed (pitch × RPM / gear ratio / 1215.2) and actual GPS speed. Slip % = (theoretical − actual) / theoretical × 100. Normal recreational boats run 5–15% slip.
What causes high propeller slip?
High slip (> 25%) is caused by hull fouling, propeller damage, incorrect pitch for load, or heavy displacement. Clean hull regularly, inspect prop blades for nicks, and consider re-pitching.
What is cavitation and how does tip speed affect it?
Cavitation occurs when propeller tip speed creates low-pressure bubbles that implode on the blade surface, causing damage and loss of thrust. Tip speed = π × diameter × shaft RPM / 12. Below 9,000 ft/min is safe; above 14,000 ft/min is critical.
What is the ideal propeller slip for recreational boats?
5–15% slip is ideal for most recreational planing boats. Displacement hulls typically run 10–20%. Racing props can achieve 3–8%. Slip outside these ranges warrants inspection.