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Torque Formula:
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The torque formula calculates rotational force from horsepower and RPM. It's a fundamental equation in mechanical engineering used to determine the twisting force produced by engines, motors, and other rotational systems.
The calculator uses the torque formula:
Where:
Explanation: The constant 5252 comes from the relationship between rotational speed, power, and torque, where horsepower and torque are equal at 5252 RPM.
Details: Torque calculation is essential for engine performance analysis, vehicle design, motor selection, and understanding the power characteristics of rotational systems in various applications.
Tips: Enter horsepower in hp and RPM in rotations per minute. All values must be valid (HP > 0, RPM > 0).
Q1: Why is 5252 the constant in the formula?
A: 5252 is derived from the relationship where one horsepower equals 550 foot-pounds per second, and there are 2π radians in a revolution.
Q2: What are typical torque values for engines?
A: Torque values vary widely by engine type. Automotive engines typically produce 100-500 lb-ft, while industrial engines can produce much higher values.
Q3: How does torque relate to vehicle performance?
A: Torque determines a vehicle's acceleration and pulling power, while horsepower relates to top speed. Higher torque at lower RPMs provides better low-end acceleration.
Q4: Can this formula be used for electric motors?
A: Yes, the formula applies to any rotational power system, including electric motors, though electric motors often have different torque characteristics than combustion engines.
Q5: What's the difference between lb-ft and Nm torque measurements?
A: lb-ft (pound-feet) is the imperial unit, while Nm (Newton-meters) is the metric unit. 1 lb-ft equals approximately 1.3558 Nm.