Skip to main content
CalcPro

Propeller Open Water Efficiency & Cavitation Number Calculator

Easily calculate and compute propeller open water efficiency & cavitation number calculator with accurate equations, live formulas, and expert guidance.

Calculated Result
0.51 ratio

Propeller Cavitation Number (σ_0.7R)

Propeller Cavitation Number (σ_0.7R)

0.51 ratio

Keller Minimum Blade Area Ratio

0.431

Blade Tip Speed M Per S

34.1

Cavitation Vulnerability

MODERATE / CONTROLLED CAVITATION MARGIN

0.51 — ratio

Calculation Breakdown

  1. Applied FormulaCalculates the local blade section cavitation number σ at 0.7 radius and applies Kellers formula to size expanded blade area ratio (AE/A0) to avoid cavitation erosion.\sigma_{0.7R} = \frac{p_0 + \rho g h_{\text{shaft}} - p_v}{\frac{1}{2} \rho \left[ v_a^2 + (0.7 \pi n D)^2 \right]}, \quad \text{Keller Limit} \implies \frac{A_E}{A_0}

Propeller Cavitation Number σ Metric Output

Interactive visualization based on your current inputs

Calculated Value
0.00.30.50.81.0Propeller Cavitation Number (σ_0.7R)

What Is the Propeller Open Water Efficiency & Cavitation Number Calculator?

This tool computes propeller open water efficiency & cavitation number calculator with high precision arithmetic.

How Does the Propeller Open Water Efficiency & Cavitation Number Calculator Work?

Calculates the local blade section cavitation number σ at 0.7 radius and applies Kellers formula to size expanded blade area ratio (AE/A0) to avoid cavitation erosion.

Propeller Open Water Efficiency & Cavitation Number Calculator Formula & Variables

The core mathematical equation utilized by this calculator is expressed as:

σ0.7R=p0+ρghshaft−pv12ρ[va2+(0.7πnD)2],Keller Limit  ⟹  AEA0\sigma_{0.7R} = \frac{p_0 + \rho g h_{\text{shaft}} - p_v}{\frac{1}{2} \rho \left[ v_a^2 + (0.7 \pi n D)^2 \right]}, \quad \text{Keller Limit} \implies \frac{A_E}{A_0}

Calculates the local blade section cavitation number σ at 0.7 radius and applies Kellers formula to size expanded blade area ratio (AE/A0) to avoid cavitation erosion.

How to Use the Propeller Open Water Efficiency & Cavitation Number Calculator

  1. Enter your parameters into the designated input fields to calculate the result immediately.

Step-by-Step Example Calculation

Propeller Open Water Efficiency & Cavitation Number Calculator Example

Input Values:

shaftImmersionDepthMeters:6.5
speedOfAdvanceKnots:16
propellerRpm:105
propellerDiameterMeters:6.2
propellerThrustKn:750
numberOfBladesZ:5
Worked Steps: Sample evaluation based on standard reference conditions.

Understanding Your Result

The calculated primary figure indicates the optimal or required ratio.

Factors That Affect the Result

  • Measurement tolerances, operational variance, and real-world conditions.

When Should You Use This Calculator?

  • Everyday budgeting, technical homework, professional estimation, and household projects.

Assumptions & Limitations

  • Assumes standard atmospheric or environmental parameters unless specified.

Frequently Asked Questions

Calculation Accuracy & Reference Note

Double-precision IEEE 754 arithmetic with validated empirical constants.

\n

Related Calculators

Explore more tools and calculators in Physics Calculators

Length Converter

Convert length and distance between metric and imperial units including meters, feet, inches, kilometers, miles, and yards with exact SI definitions.

Percentage Calculator

Calculate percentages: what % X is of Y, P% of X, % change, discount price, and percentage points.

Temperature Converter

Convert temperatures between Celsius (°C), Fahrenheit (°F), Kelvin (K), and Rankine (°R) with step-by-step thermodynamic formulas.

Ohm's Law & Electrical Power Calculator

Calculate Voltage (V), Current (I), Resistance (R), and Electrical Power (P) across DC circuits.

Density, Mass & Volume Calculator

Calculate density (ρ = m/V), material mass, or physical volume for solids, liquids, and gases.

Steam Turbine Surface Condenser Cooling Water Duty Calculator

Calculates surface condenser thermal heat rejection (MWth), circulating cooling water pumping volume (m³/h), and steam condensation rate.