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, T_p(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, T_p(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, T_p(ft.lbs) = 5252 * PHP / PS_(rev/s)

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

PHP = propeller horsepower.

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

Propeller 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, T_p(ft.lbs) = 5252 * PHP / PS_(rev/s)

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

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

T_p(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: T_p(ft.lbs) = 70902ft.lbs ,PS_(rev/s)  = 2000 RPM.

Propeller torque, T_p(ft.lbs) = 5252 * PHP / PS_(rev/s)

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

PHP = T_{p(ft.lbs) *} PS_(rev/s) / 5252

PHP = 70902 * 33.33 / 5252

PHP = 450HP.