螺旋桨节距与滑脱率计算器 ⚙️
计算螺旋桨滑脱率和气蚀风险。输入节距、直径、转速和传动比分析推进效率。
如何使用螺旋桨节距与滑脱率计算器
输入螺旋桨节距（英寸）、直径、发动机转速、传动比和GPS实际速度。计算器输出理论速度、滑脱率和叶尖速度的气蚀风险。
5–15%的滑脱率对于娱乐艇属于正常范围。滑脱率>25%可能表示船底污损、螺旋桨损坏或节距不当。
气蚀风险基于叶尖速度（π×直径×轴转速/12）。低于9,000 ft/min为安全；超过14,000 ft/min会造成叶片侵蚀。
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.