Hi everyone, I am designing a mixer that will combine silica sand with a small amount of sulfuric acid and need to properly size a motor/speed reducer assembly for this application. The mixer will be run at an operating speed of 60 rpm. The blade configuration in the mixer will be similar to the attached image. I am having difficulty in determining the torque requirements. Assuming that I can accurately determine the torque required to rotate the mixer assembly itself… How can I evaluate the additional torque requirements due to the resistance on the mixer blades from the sand? (I am using the equation Tmotor = (Tload+Tacceleration)*Safety Factor) Thanks!