public MecanumDrive(Motor leftFront,Motor leftRear,Motor rightFront,Motor rightRear,AngleSensor gyro){
  this(leftFront,leftRear,rightFront,rightRear,gyro,null);
}

public MecanumDrive ( Motor leftFront , Motor leftRear , Motor rightFront , Motor rightRear , AngleSensor gyro ) { this ( leftFront , leftRear , rightFront , rightRear , gyro , null ) ; }
creates a new drivesystem subsystem that uses the supplied drive train and no shifter . the voltage send to the drive train is limited to [ - 1 . 0 , 1 . 0 ] .
