RAD 4.0 Basics

The 4.0 was basically the same as the 3.0 model.   Nothing changed, its the same boring Robot as the 3.0.  It gets stuck in carpet, its remote is flaky and you lucky if you find one that works.  I actually think this design is what ended the series of RADs.  This is the one that lead to the loss of interest in RAD Robots.  Plus the fact that as a robot chassis you could Hack a RC car robot together that would be much more useful.   The control circuit is of at least a little use.   The circuit could be removed, and the drive motor wires could be connected to different dual motor drive system.  You could then just speak commands to the circuits microphone and have a voice activated robot.  All you would have to do is power the circuit with 6 volts and make the microphone was mounted where it would hear you.   
Hacking the 4.0 body into something useful would be about as much work as building a robot from scratch.  The arms are not jointed so to power them and make them flex at the wrist would be same amount of work as just making them from wood.  The shoulder joint is movable but mounting a motor would be a lot of work, just to use the shell of a the arm.  The grippers are just spring loaded.  Again they look cool, but you would have to move the spring and add a way to power them.  The hinge joint on the gripper is weak would have to be beefed up to put up to powered use.   You would have to just attach the ends of the grippers to whatever you construct, because very little is there that can made into a powered gripper unit.