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Speed at Haul and Return in Miles per Hour is a calculation used in scraper production to determine the average speed of equipment during hauling and returning operations based on distance traveled and variable time.
The calculator uses the formula:
Where:
Explanation: The formula calculates the average speed by dividing the total distance (haul + return) by the product of 88 and the variable time. The constant 88 converts feet per minute to miles per hour.
Details: Accurate speed calculation is crucial for optimizing scraper production efficiency, estimating project timelines, and calculating equipment productivity in earthmoving operations.
Tips: Enter haul distance and return distance in feet, and variable time in minutes. All values must be positive numbers greater than zero.
Q1: Why is the constant 88 used in the formula?
A: The constant 88 is used to convert feet per minute to miles per hour (1 mph = 88 ft/min).
Q2: What is considered typical speed ranges for scraper operations?
A: Typical speeds vary based on equipment type and terrain, but generally range from 10-25 mph for haul operations and 15-30 mph for return trips.
Q3: How does variable time affect the speed calculation?
A: Variable time represents the total time for both haul and return operations. Longer variable times result in lower calculated average speeds.
Q4: Are there limitations to this calculation?
A: This calculation provides an average speed and doesn't account for acceleration, deceleration, or varying speeds during different segments of the operation.
Q5: Can this formula be used for other types of earthmoving equipment?
A: While the basic principle applies, specific constants and factors may vary for different equipment types and operational conditions.