RPM Formula:
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Definition: This calculator determines the revolutions per minute (RPM) based on speed, a constant factor, and diameter.
Purpose: It helps in mechanical and automotive applications to understand the relationship between linear speed and rotational speed.
The calculator uses the formula:
Where:
Explanation: The speed multiplied by the constant (which converts units) and divided by the diameter gives the rotational speed.
Details: Understanding RPM is crucial for proper gear selection, engine performance optimization, and mechanical system design.
Tips: Enter the speed in mph, the constant (default 336), and the diameter in inches. All values must be > 0.
Q1: Why is the constant 336?
A: The constant 336 comes from unit conversion (5280 ft/mile × 12 in/ft ÷ 60 min/hour).
Q2: What diameter should I use?
A: Use the effective rolling diameter of your wheel or rotating component.
Q3: Can I use this for different units?
A: Yes, but you'll need to adjust the constant factor accordingly for different unit systems.
Q4: How accurate is this calculation?
A: It provides theoretical RPM. Actual RPM may vary due to factors like tire slip or load.
Q5: What applications use this calculation?
A: Automotive tuning, conveyor systems, and any rotating machinery where speed-RPM relationship matters.