Enter the propeller horsepower (HP) and the propeller speed (RPM) into the calculator to determine the Propeller Torque. 

Propeller Torque Formula

The following formula is used to calculate the Propeller Torque. 

Tp = 5252 * PHP / PS
  • Where Tp is the Propeller Torque (N-m)
  • PHP is the propeller horsepower (HP) 
  • PS is the propeller speed (RPM) 

To calculate the propeller torque, divide the propeller horsepower by the propeller speed, then multiply by 5252.

How to Calculate Propeller Torque?

The following two example problems outline how to calculate the Propeller Torque.

Example Problem #1:

  1. First, determine the propeller horsepower (HP). In this example, the propeller horsepower (HP) is given as 23.
  2. Next, determine the propeller speed (RPM). For this problem, the propeller speed (RPM) is given as 85.
  3. Finally, calculate the Propeller Torque using the equation above: 

Tp = 5252 * PHP / PS

Inserting the values from above and solving the equation with the imputed values gives: 

Tp = 5252 * 23/ 85 = 1421.12 (N-m)

Example Problem #2: 

Using the same process as above, first define the variables required by the formula. In this case, these values are:

propeller horsepower (HP) = 91

propeller speed (RPM) = 85

Entering these values yields:

Tp = 5252 * 91 / 85 = 5622.72 (N-m)