This example shows a gear box with efficiency measured by applying a variable torque to the gearbox box output shaft for a fixed input shaft speed. Power is measured on both the input and output shafts, and efficiency is calculated as the ratio of output to input power. The simulation results validate the Simple Gear block mask parameters are correctly used. The output torque starts and finishes at zero, and hence efficiency starts and finishes at zero. The peak output torque is set equal to the Simple Gear mask parameter Nominal output torque, and hence the peak efficiency should be equal to the Simple Gear mask parameter Efficiency at nominal output torque, this value being 0.8.