<R1> Only one (1) robot will be allowed to compete per team in the VEX Robotics Competition.
Though it is expected that teams will make changes to their robot at the competition, a team is limited
to only one (1) robot. As such, a VEX robot, for the purposes of the VEX Robotics Competition, has
the following subsystems:
Subsystem 1: Mobile robotic base including wheels, tracks, legs, or any other mechanism that allows
the robot to navigate the majority of the flat playing field surface. For a stationary robot, the robotic
base without wheels would be considered Subsystem 1.
Subsystem 2: Power and control system that includes a VEX legal battery, a VEX control system,
and associated motors for the mobile robotic base.
Subsystem 3: Additional mechanisms (and associated motors) that allow manipulation of game
objects or navigation of field obstacles.
So... If you change subsystem 2 of your robot during a competition, it is not legal.
BUT if you switch robots after a competition for another competition, this is perfectly legal. Although it is legal, it is highly advised to not do because it is unethical and not right for other teams...
How would you like to see a middle school team bring a high school built robot to a middle school competition?