A hybrid transducer type ultrasonic motor, which the authors proposed previously, employs two ultrasonic transducers to control the Lissajous figure at the contract surface of the stator. This motor is stable even at low speed, and realizes a large output with a high efficiency, due to the high controlability of the Lissajous figure. The experimental investigation of the characteristics of the hybrid transducer type ultrasonic motor is presented. In addition, the maximum torque is roughly estimated by means of a simple model. Then, the dependence of the diameter of the motor (transducer) on the maximum torque is discussed and demonstrated experimentally.