1. What is a Propeller Torque Calculator for Boat?

Definition: This calculator determines the torque produced by a boat's propeller based on the engine power and rotational speed.

Purpose: It helps marine engineers and boat designers understand the torque requirements for propeller shafts and related components.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( T \) — Torque (Newton-meters, Nm)
• \( P \) — Power (Watts, W)
• \( n \) — Rotational speed (revolutions per second, rev/s)
• \( \pi \) — Mathematical constant Pi (~3.1416)

Explanation: The power is divided by the angular velocity (2πn) to calculate the torque produced by the propeller.

3. Importance of Propeller Torque Calculation

Details: Proper torque calculation ensures correct sizing of propeller shafts, bearings, and other drivetrain components to prevent mechanical failures.

4. Using the Calculator

Tips: Enter the engine power in Watts and propeller rotational speed in revolutions per second. Both values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: How do I convert horsepower to Watts?
A: Multiply horsepower by 745.7 (1 HP = 745.7 Watts).

Q2: What if my speed is in RPM instead of rev/s?
A: Divide RPM by 60 to convert to rev/s before entering the value.

Q3: Does this account for propeller efficiency?
A: No, this calculates theoretical torque. Actual torque may differ due to efficiency losses.

Q4: Why is torque important in boat design?
A: Torque determines the twisting force on the propeller shaft, affecting component sizing and durability.

Q5: What's a typical torque range for boat propellers?
A: This varies widely based on boat size and engine power, from a few Nm for small boats to thousands for large vessels.