3.2. Calculating Maximum Usable Rimpull

Try these first

1. 1.

   What is rimpull?

   Hint

   Think about how the scraper exerts force.

2. 2.

   Define coefficient of traction.

   Hint

   It relates to how well a vehicle can hold onto the ground.

3. 3.

   What does rimpull depend on?

   • Rolling Resistance
   • Coefficient of Traction
   • Engine Power

   Hint

   Think about what allows the scraper wheels to grip.

4. 4.

   Is altitude correction needed when operating at 600 meters?

   • True
   • False

   Hint

   Recall how altitude impacts engine performance.

5. 5.

   For a scraper with a gross weight of 80,000 kg and a coefficient of traction of 0.6, calculate the effective rimpull available after accounting for 2% rolling resistance and a 5% deduction at 900 meters.

   Hint

   Carry out each step incrementally, considering the deductions along the way.

6. 6.

   A scraper operates at an altitude affecting its engine efficiency and traction. Given the same parameters as the above, how would the results differ if it operated at a coastal level versus 1,200 meters altitude?

   Hint

   Compare the rimpull outcomes at different altitudes, paying attention to percentage deductions.