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HO Scale Speed Formula:
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HO scale (1:87 scale) speed calculation converts real-world prototype speeds to equivalent model train speeds. This helps model railroaders achieve realistic operation by scaling down prototype speeds proportionally to the 1:87 scale ratio.
The calculator uses the HO scale conversion formula:
Where:
Explanation: Since HO scale models are 1/87th the size of real trains, their speeds must also be scaled down by the same factor to maintain realistic appearance and operation.
Details: Proper scale speed conversion is essential for creating realistic model railroad operations. It ensures that model trains move at speeds that appear natural and proportional to their scale, enhancing the overall realism of the layout.
Tips: Enter the prototype speed in miles per hour (mph). The calculator will automatically compute the equivalent HO scale speed. Valid input must be greater than 0.
Q1: Why divide by 87 specifically?
A: HO scale has a ratio of 1:87, meaning 1 unit on the model represents 87 units in real life. Speed must be scaled by the same ratio for realistic appearance.
Q2: How accurate is this conversion for model operation?
A: This provides mathematically correct scale speed, but actual model performance may vary based on motor characteristics, track conditions, and weight.
Q3: Can this be used for other scales?
A: Yes, but you would need to use the appropriate scale ratio (N scale: 1:160, O scale: 1:48, etc.) instead of 87.
Q4: What are typical prototype speeds to convert?
A: Freight trains: 25-50 mph, Passenger trains: 50-79 mph, High-speed trains: 80-150+ mph. Scale these down for realistic model operation.
Q5: How do I measure model speed accurately?
A: Use timing gates, smartphone apps with speed measurement, or calibrated speedometers designed for model railroads.