1. What is the Torque Formula?

The torque formula calculates rotational force from horsepower and RPM. It's a fundamental equation in mechanical engineering that relates power, rotational speed, and torque output in engines and motors.

2. How Does the Calculator Work?

The calculator uses the torque formula:

Where:

• \( \tau \) — Torque (lb-ft)
• \( HP \) — Horsepower
• \( n \) — Rotational speed (RPM)
• 5252 — Conversion constant (derived from the relationship between power, torque, and angular velocity)

Explanation: The constant 5252 comes from the fact that 1 horsepower is defined as 550 foot-pounds per second, and there are 2π radians in a revolution with 60 seconds in a minute.

3. Importance of Torque Calculation

Details: Torque calculation is essential for engine performance analysis, vehicle dynamics, mechanical design, and understanding the power characteristics of rotating machinery. It helps engineers determine the twisting force available at different engine speeds.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: Why is 5252 the constant in the formula?
A: 5252 is derived from the conversion between different units of measurement. It comes from (550 ft-lb/sec/hp) × (60 sec/min) ÷ (2π radians/revolution).

Q2: What are typical torque values for engines?
A: Torque values vary widely by engine type. Small car engines might produce 100-200 lb-ft, while large diesel engines can produce over 1000 lb-ft of torque.

Q3: How does torque relate to vehicle performance?
A: Torque determines a vehicle's acceleration and pulling power. Higher torque at lower RPMs generally means better low-end acceleration and towing capability.

Q4: Can this formula be used for electric motors?
A: Yes, the same formula applies to electric motors, though they typically have different torque curves than internal combustion engines.

Q5: What's the difference between torque and horsepower?
A: Torque is a measure of rotational force, while horsepower is a measure of power (work done over time). Horsepower = (Torque × RPM) ÷ 5252.