# Propeller Torque Calculator, Formula, Propeller Torque Calculation

## Propeller Torque Calculator:

Enter the values of Power output of the propeller in horsepower, PHP and Propeller speed, PS(rev/s) in revolution per second to determine the value of propeller torque, Tp(ft.lbs).

 Enter Propeller Horsepower: Enter Propeller Speed: rev/s Result – Propeller Torque: ft.lbs

## Propeller Torque Formula:

Propeller torque is a crucial measurement in the field of aerodynamics and marine engineering, referring to the rotational force generated by a propeller. This force is directly related to the power output of an engine and the speed at which the propeller operates.

Propeller torque, Tp(ft.lbs) in foot pounds is equated by dividing the product of 5252 and Power output of the propeller in horsepower, PHP by Propeller speed, PS(rev/s) in revolutions per second, rev/s.

Propeller torque, Tp(ft.lbs) = 5252 * PHP / PS(rev/s)

Tp(ft.lbs) = propeller torque in foot pounds, ft.lbs.

PHP = propeller horsepower.

PS(rev/s) = propeller speed in revolution per second.

Propeller Torque Calculation:

Learn More:   Kinetic Energy to Torque Calculator, Formula, Kinetic Energy to Torque Calculation

1. Given a propeller output of 300HP at a speed of 2500 revolutions per minute, RPM. Calculate the torque generated by the propeller.

Given: PHP = 300 HP, PS(rev/s)  = 2500 RPM.

Propeller torque, Tp(ft.lbs) = 5252 * PHP / PS(rev/s)

Convert PS from RPM to revolutions per second, PS(rev/s) = 2500 / 60 = 41.67rev/s

Tp(ft.lbs) = 5252 * 300 / 41.67

Tp(ft.lbs) = 37806.4ft.lbs

2. If the propeller torque is70902ft.lbs and the propeller speed is 2000RPM, what is the boat engines output power?

Given: Tp(ft.lbs) = 70902ft.lbs ,PS(rev/s)  = 2000 RPM.

Propeller torque, Tp(ft.lbs) = 5252 * PHP / PS(rev/s)

Convert PS from RPM to revolutions per second, PS(rev/s) = 2000 / 60 = 33.33rev/s

PHP = Tp(ft.lbs) * PS(rev/s) / 5252

PHP = 70902 * 33.33 / 5252

PHP = 450HP.