1. What is the Motor HP to Torque Formula?

The Motor HP to Torque formula calculates the torque output of an engine or motor based on its horsepower and rotational speed. This relationship is fundamental in mechanical engineering and automotive applications.

2. How Does the Calculator Work?

The calculator uses the torque formula:

Where:

• \( T \) — Torque (ft-lb)
• \( HP \) — Horsepower
• \( RPM \) — Revolutions per minute
• \( 5252 \) — Conversion constant

Explanation: The constant 5252 comes from the relationship between horsepower, torque, and RPM, where 1 horsepower is defined as 550 foot-pounds per second and there are 60 seconds in a minute.

3. Importance of Torque Calculation

Details: Torque calculation is essential for understanding engine performance, gear selection, vehicle acceleration, and mechanical system design. It helps engineers optimize power transmission and efficiency.

4. Using the Calculator

Tips: Enter horsepower and RPM values. Both values must be positive numbers. The calculator will compute the torque in foot-pounds (ft-lb).

5. Frequently Asked Questions (FAQ)

Q1: Why is the constant 5252 used in the formula?
A: 5252 is derived from the conversion between horsepower and torque, where 1 HP = 550 ft-lb/sec and there are 60 seconds in a minute (550 × 60 ÷ 2π ≈ 5252).

Q2: What is the difference between horsepower and torque?
A: Torque is a measure of rotational force, while horsepower is a measure of power (work done over time). Horsepower = (Torque × RPM) ÷ 5252.

Q3: At what RPM does horsepower equal torque?
A: Horsepower and torque are numerically equal at 5252 RPM due to the formula's constant.

Q4: Can this formula be used for electric motors?
A: Yes, the formula applies to all rotating machinery including electric motors, internal combustion engines, and turbines.

Q5: What are typical torque values for different engines?
A: Small car engines: 100-200 ft-lb, performance cars: 300-500 ft-lb, heavy trucks: 800-2000 ft-lb, industrial motors vary widely by application.