Yes, it’s really hard to think of a robot with only 4 RC servos without any other actuator. The most common robot is wheel robot with only 2 360 degree rotate RC servos. But, actually you can notice that there is other examples of robot that build from 4 RC servos. One of them is Biped Walker. Thus, today i try to build this robot to test the performance. Another reason is recently we have come out with new product called IFC-RS08 which stand for RC Servo Card (8 Channel RC Servo Controller) and would like to build a application from this product. The construction are pretty easy if compare with other 6 RC Servo Biped. I use roughly 3-4 hours to successfully build and program this robot.