I have been given a project at work to find the number of dozers needed to push a certain volume of material in a certain amount of time. My issue comes with the actual horsepower of the dozers. We run D10T, D11R, D11R CD, and D11T Cat "track-type tractors". So from what I am thinking, I want to find the horsepower to push one cubic yard of our material, then I can easily find the production and the final result. However, my issue comes from finding the horsepower. I do not want to use the horsepowers or torque given in the specifications from Cat, but need to calculate the horsepower for each dozer in each type of material. All I know is the velocity, force the dozer is exerting on the dirt, volume of the dirt being pushed, material characteristics, and the RPM. Any ideas on how to solve this issue?