I'm working with a padfoot(spiked) drum compactor. If you roll one time over an area the feet will compact only 13.8% of the area you covered. I'm trying to calculate how many times you need to roll back and forth to have (averaged) 90% coverage.
The point of this is to than increase the surface area of the feet so that 90% can be reached in 8 passes, without unneccessarily increasing the size as that reduces the ground pressure of each pass, giving a diminished return.