diff --git a/f450/f450.sdf b/f450/f450.sdf
deleted file mode 100644
index d1ea134939196ab19fc8d0b3804ffeb905a22d8e..0000000000000000000000000000000000000000
--- a/f450/f450.sdf
+++ /dev/null
@@ -1,1231 +0,0 @@
-<?xml version='1.0'?>
-<sdf version='1.5'>
-  <model name='f450'>
-    <link name='base_link'>
-      <pose frame=''>0 0 0 0 -0 0</pose>
-      <inertial>
-        <pose frame=''>0 0 0 0 -0 0</pose>
-        <mass>2</mass>
-        <inertia>
-          <ixx>0.0337</ixx>
-          <ixy>0</ixy>
-          <ixz>0</ixz>
-          <iyy>0.0337</iyy>
-          <iyz>0</iyz>
-          <izz>0.0185</izz>
-        </inertia>
-      </inertial>
-      <self_collide>0</self_collide>
-      <kinematic>0</kinematic>
-      <velocity_decay/>
-      <gravity>1</gravity>
-      <visual name='base_link_inertia_visual'>
-        <pose frame=''>0 0 0 0 -0 0</pose>
-        <geometry>
-          <mesh>
-            <scale>1 1 1</scale>
-            <uri>model://f450/meshes/f450.dae</uri>
-          </mesh>
-        </geometry>
-        <material>
-          <script>
-            <name>Gazebo/White</name>
-            <uri>file://media/materials/scripts/gazebo.material</uri>
-          </script>
-          <ambient>1 1 1 1</ambient>
-          <diffuse>1 1 1 1</diffuse>
-          <specular>0 0 0 1</specular>
-          <emissive>0 0 0 1</emissive>
-          <shader type='vertex'>
-            <normal_map>__default__</normal_map>
-          </shader>
-        </material>
-        <cast_shadows>1</cast_shadows>
-        <transparency>0</transparency>
-      </visual>
-      <collision name='base_link_inertia_collision'>
-        <laser_retro>0</laser_retro>
-        <max_contacts>10</max_contacts>
-        <pose frame=''>0 0 0 0 -0 0</pose>
-        <geometry>
-          <mesh>
-            <uri>model://f450/meshes/f450.dae</uri>
-          </mesh>
-        </geometry>
-        <surface>
-          <friction>
-            <ode>
-              <mu>1</mu>
-              <mu2>1</mu2>
-              <fdir1>0 0 0</fdir1>
-              <slip1>0</slip1>
-              <slip2>0</slip2>
-            </ode>
-          </friction>
-          <bounce>
-            <restitution_coefficient>0</restitution_coefficient>
-            <threshold>1e+06</threshold>
-          </bounce>
-          <contact>
-            <collide_without_contact>0</collide_without_contact>
-            <collide_without_contact_bitmask>1</collide_without_contact_bitmask>
-            <collide_bitmask>1</collide_bitmask>
-            <ode>
-              <soft_cfm>0</soft_cfm>
-              <soft_erp>0.2</soft_erp>
-              <kp>1e+13</kp>
-              <kd>1</kd>
-              <max_vel>0.01</max_vel>
-              <min_depth>0</min_depth>
-            </ode>
-            <bullet>
-              <split_impulse>1</split_impulse>
-              <split_impulse_penetration_threshold>-0.01</split_impulse_penetration_threshold>
-              <soft_cfm>0</soft_cfm>
-              <soft_erp>0.2</soft_erp>
-              <kp>1e+13</kp>
-              <kd>1</kd>
-            </bullet>
-          </contact>
-        </surface>
-      </collision>
-    </link>
-    <link name='/imu_link'>
-      <pose frame=''>0 0 0 0 -0 0</pose>
-      <inertial>
-        <pose frame=''>0 0 0 0 -0 0</pose>
-        <mass>0.015</mass>
-        <inertia>
-          <ixx>1e-05</ixx>
-          <ixy>0</ixy>
-          <ixz>0</ixz>
-          <iyy>1e-05</iyy>
-          <iyz>0</iyz>
-          <izz>1e-05</izz>
-        </inertia>
-      </inertial>
-      <self_collide>0</self_collide>
-      <kinematic>0</kinematic>
-    </link>
-
-    <link name='f450/robot_camera'>
-      <pose frame=''>0.12 -0 0.06 0 -0 0</pose>
-      <inertial>
-        <pose frame=''>0 0 0 0 -0 0</pose>
-        <mass>0.015</mass>
-        <inertia>
-          <ixx>1e-06</ixx>
-          <ixy>0</ixy>
-          <ixz>0</ixz>
-          <iyy>1e-06</iyy>
-          <iyz>0</iyz>
-          <izz>1e-06</izz>
-        </inertia>
-      </inertial>
-      <self_collide>0</self_collide>
-      <kinematic>0</kinematic>
-      <sensor name='camera' type='camera'>
-        <always_on>1</always_on>
-        <update_rate>30</update_rate>
-        <camera name='__default__'>
-          <horizontal_fov>1</horizontal_fov>
-          <image>
-            <width>640</width>
-            <height>480</height>
-          </image>
-          <clip>
-            <near>0.1</near>
-            <far>100</far>
-          </clip>
-        </camera>
-        <plugin name='camera_plugin' filename='libgazebo_ros_camera.so'>
-          <alwaysOn>true</alwaysOn>
-          <imageTopicName>image_raw_front</imageTopicName>
-          <cameraInfoTopicName>camera_info</cameraInfoTopicName>
-          <updateRate>10.0</updateRate>
-          <cameraName>uav_camera</cameraName>
-          <frameName>f450/robot_camera</frameName>
-          <CxPrime>320.5</CxPrime>
-          <Cx>320.5</Cx>
-          <Cy>240.5</Cy>
-          <hackBaseline>0</hackBaseline>
-          <focalLength>10</focalLength>
-          <distortionK1>0.0</distortionK1>
-          <distortionK2>0.0</distortionK2>
-          <distortionK3>0.0</distortionK3>
-          <distortionT1>0.0</distortionT1>
-          <distortionT2>0.0</distortionT2>
-          <robotNamespace>/</robotNamespace>
-        </plugin>
-      </sensor>
-      <visual name='visual'>
-        <geometry>
-          <box>
-            <size>0.001 0.001 0.001</size>
-          </box>
-        </geometry>
-        <pose frame=''>0 0 0 0 -0 0</pose>
-        <cast_shadows>1</cast_shadows>
-        <transparency>0</transparency>
-        <material>
-          <shader type='pixel'/>
-        </material>
-      </visual>
-    </link>
-    <link name='f450/robot_camera_down'>
-      <pose frame=''>-0.12 -0 0.01 -9.4e-05 1.57079 -9.4e-05</pose>
-      <inertial>
-        <pose frame=''>0 0 0 0 -0 0</pose>
-        <mass>0.015</mass>
-        <inertia>
-          <ixx>1e-06</ixx>
-          <ixy>0</ixy>
-          <ixz>0</ixz>
-          <iyy>1e-06</iyy>
-          <iyz>0</iyz>
-          <izz>1e-06</izz>
-        </inertia>
-      </inertial>
-      <self_collide>0</self_collide>
-      <kinematic>0</kinematic>
-      <sensor name='camera' type='camera'>
-        <always_on>1</always_on>
-        <update_rate>30</update_rate>
-        <camera name='__default__'>
-          <horizontal_fov>1</horizontal_fov>
-          <image>
-            <width>640</width>
-            <height>480</height>
-          </image>
-          <clip>
-            <near>0.1</near>
-            <far>100</far>
-          </clip>
-        </camera>
-        <plugin name='camera_plugin' filename='libgazebo_ros_camera.so'>
-          <alwaysOn>true</alwaysOn>
-          <imageTopicName>image_raw_down</imageTopicName>
-          <cameraInfoTopicName>camera_info</cameraInfoTopicName>
-          <updateRate>10.0</updateRate>
-          <cameraName>uav_camera</cameraName>
-          <frameName>f450/robot_camera_down</frameName>
-          <CxPrime>320.5</CxPrime>
-          <Cx>320.5</Cx>
-          <Cy>240.5</Cy>
-          <hackBaseline>0</hackBaseline>
-          <focalLength>1</focalLength>
-          <distortionK1>0.0</distortionK1>
-          <distortionK2>0.0</distortionK2>
-          <distortionK3>0.0</distortionK3>
-          <distortionT1>0.0</distortionT1>
-          <distortionT2>0.0</distortionT2>
-          <robotNamespace>/</robotNamespace>
-        </plugin>
-      </sensor>
-      <visual name='visual'>
-        <geometry>
-          <box>
-            <size>0.001 0.001 0.001</size>
-          </box>
-        </geometry>
-        <pose frame=''>0 0 0 0 -0 0</pose>
-        <cast_shadows>1</cast_shadows>
-        <transparency>0</transparency>
-        <material>
-          <shader type='pixel'/>
-        </material>
-      </visual>
-    </link>
-    <link name='f450/robot_sonar_down'>
-      <pose frame=''>-0.15 0 0.01 -9.4e-05 1.57079 -9.4e-05</pose>
-      <inertial>
-        <pose frame=''>0 0 0 0 -0 0</pose>
-        <mass>0.015</mass>
-        <inertia>
-          <ixx>1e-06</ixx>
-          <ixy>0</ixy>
-          <ixz>0</ixz>
-          <iyy>1e-06</iyy>
-          <iyz>0</iyz>
-          <izz>1e-06</izz>
-        </inertia>
-      </inertial>
-      <self_collide>0</self_collide>
-      <kinematic>0</kinematic>
-      <sensor name='sonar' type='ray'>
-        <always_on>1</always_on>
-        <update_rate>100</update_rate>
-        <ray>
-          <range>
-            <min>0.2</min>
-            <max>40</max>
-            <resolution>0.01</resolution>
-          </range>
-          <scan>
-            <horizontal>
-              <samples>100</samples>
-              <min_angle>-3</min_angle>
-              <max_angle>3</max_angle>
-              <resolution>1</resolution>
-            </horizontal>
-          </scan>
-        </ray>
-        <plugin name='gazebo_ros_sonar_controller' filename='libhector_gazebo_ros_sonar.so'>
-          <gaussianNoise>0.02</gaussianNoise>
-          <topicName>sonar</topicName>
-          <frameId>sonar_link</frameId>
-          <robotNamespace>/</robotNamespace>
-        </plugin>
-      </sensor>
-      <visual name='visual'>
-        <geometry>
-          <box>
-            <size>0.001 0.001 0.001</size>
-          </box>
-        </geometry>
-        <pose frame=''>0 0 0 0 -0 0</pose>
-        <cast_shadows>1</cast_shadows>
-        <transparency>0</transparency>
-        <material>
-          <shader type='pixel'/>
-        </material>
-      </visual>
-    </link>
-    <link name='rotor_0'>
-      <pose frame=''>0.159 -0.159 0.11 0 -0 0</pose>
-      <inertial>
-        <pose frame=''>0 0 0 0 -0 0</pose>
-        <mass>0.005</mass>
-        <inertia>
-          <ixx>9.75e-07</ixx>
-          <ixy>0</ixy>
-          <ixz>0</ixz>
-          <iyy>0.000273104</iyy>
-          <iyz>0</iyz>
-          <izz>0.000274004</izz>
-        </inertia>
-      </inertial>
-      <self_collide>0</self_collide>
-      <kinematic>0</kinematic>
-      <velocity_decay/>
-      <visual name='rotor_0_visual'>
-        <pose frame=''>0 0 0 0 -0 0</pose>
-        <geometry>
-          <mesh>
-            <scale>1 1 1</scale>
-            <uri>model://rotors_description/meshes/iris_prop_ccw.dae</uri>
-          </mesh>
-        </geometry>
-        <material>
-          <script>
-            <name>Gazebo/Green</name>
-            <uri>file://media/materials/scripts/gazebo.material</uri>
-          </script>
-          <ambient>0 1 0 1</ambient>
-          <diffuse>0 1 0 1</diffuse>
-          <specular>0.1 0.1 0.1 1</specular>
-          <emissive>0 0 0 1</emissive>
-          <shader type='pixel'/>
-        </material>
-        <cast_shadows>1</cast_shadows>
-        <transparency>0</transparency>
-      </visual>
-      <collision name='rotor_0_collision'>
-        <laser_retro>0</laser_retro>
-        <max_contacts>10</max_contacts>
-        <pose frame=''>0 0 0 0 -0 0</pose>
-        <geometry>
-          <cylinder>
-            <radius>0.128</radius>
-            <length>0.005</length>
-          </cylinder>
-        </geometry>
-        <surface>
-          <friction>
-            <ode>
-              <mu>1</mu>
-              <mu2>1</mu2>
-              <fdir1>0 0 0</fdir1>
-              <slip1>0</slip1>
-              <slip2>0</slip2>
-            </ode>
-          </friction>
-          <bounce>
-            <restitution_coefficient>0</restitution_coefficient>
-            <threshold>1e+06</threshold>
-          </bounce>
-          <contact>
-            <collide_without_contact>0</collide_without_contact>
-            <collide_without_contact_bitmask>1</collide_without_contact_bitmask>
-            <collide_bitmask>1</collide_bitmask>
-            <ode>
-              <soft_cfm>0</soft_cfm>
-              <soft_erp>0.2</soft_erp>
-              <kp>1e+13</kp>
-              <kd>1</kd>
-              <max_vel>0.01</max_vel>
-              <min_depth>0</min_depth>
-            </ode>
-            <bullet>
-              <split_impulse>1</split_impulse>
-              <split_impulse_penetration_threshold>-0.01</split_impulse_penetration_threshold>
-              <soft_cfm>0</soft_cfm>
-              <soft_erp>0.2</soft_erp>
-              <kp>1e+13</kp>
-              <kd>1</kd>
-            </bullet>
-          </contact>
-        </surface>
-      </collision>
-    </link>
-    <link name='rotor_1'>
-      <pose frame=''>-0.159 0.159 0.11 0 -0 0</pose>
-      <inertial>
-        <pose frame=''>0 0 0 0 -0 0</pose>
-        <mass>0.005</mass>
-        <inertia>
-          <ixx>9.75e-07</ixx>
-          <ixy>0</ixy>
-          <ixz>0</ixz>
-          <iyy>0.000273104</iyy>
-          <iyz>0</iyz>
-          <izz>0.000274004</izz>
-        </inertia>
-      </inertial>
-      <self_collide>0</self_collide>
-      <kinematic>0</kinematic>
-      <velocity_decay/>
-      <visual name='rotor_1_visual'>
-        <pose frame=''>0 0 0 0 -0 0</pose>
-        <geometry>
-          <mesh>
-            <scale>1 1 1</scale>
-            <uri>model://rotors_description/meshes/iris_prop_ccw.dae</uri>
-          </mesh>
-        </geometry>
-        <material>
-          <script>
-            <name>Gazebo/Red</name>
-            <uri>file://media/materials/scripts/gazebo.material</uri>
-          </script>
-          <ambient>1 0 0 1</ambient>
-          <diffuse>1 0 0 1</diffuse>
-          <specular>0.1 0.1 0.1 1</specular>
-          <emissive>0 0 0 1</emissive>
-          <shader type='pixel'/>
-        </material>
-        <cast_shadows>1</cast_shadows>
-        <transparency>0</transparency>
-      </visual>
-      <collision name='rotor_1_collision'>
-        <laser_retro>0</laser_retro>
-        <max_contacts>10</max_contacts>
-        <pose frame=''>0 0 0 0 -0 0</pose>
-        <geometry>
-          <cylinder>
-            <radius>0.128</radius>
-            <length>0.005</length>
-          </cylinder>
-        </geometry>
-        <surface>
-          <friction>
-            <ode>
-              <mu>1</mu>
-              <mu2>1</mu2>
-              <fdir1>0 0 0</fdir1>
-              <slip1>0</slip1>
-              <slip2>0</slip2>
-            </ode>
-          </friction>
-          <bounce>
-            <restitution_coefficient>0</restitution_coefficient>
-            <threshold>1e+06</threshold>
-          </bounce>
-          <contact>
-            <collide_without_contact>0</collide_without_contact>
-            <collide_without_contact_bitmask>1</collide_without_contact_bitmask>
-            <collide_bitmask>1</collide_bitmask>
-            <ode>
-              <soft_cfm>0</soft_cfm>
-              <soft_erp>0.2</soft_erp>
-              <kp>1e+13</kp>
-              <kd>1</kd>
-              <max_vel>0.01</max_vel>
-              <min_depth>0</min_depth>
-            </ode>
-            <bullet>
-              <split_impulse>1</split_impulse>
-              <split_impulse_penetration_threshold>-0.01</split_impulse_penetration_threshold>
-              <soft_cfm>0</soft_cfm>
-              <soft_erp>0.2</soft_erp>
-              <kp>1e+13</kp>
-              <kd>1</kd>
-            </bullet>
-          </contact>
-        </surface>
-      </collision>
-    </link>
-    <link name='rotor_2'>
-      <pose frame=''>0.159 0.159 0.11 0 -0 0</pose>
-      <inertial>
-        <pose frame=''>0 0 0 0 -0 0</pose>
-        <mass>0.005</mass>
-        <inertia>
-          <ixx>9.75e-07</ixx>
-          <ixy>0</ixy>
-          <ixz>0</ixz>
-          <iyy>0.000273104</iyy>
-          <iyz>0</iyz>
-          <izz>0.000274004</izz>
-        </inertia>
-      </inertial>
-      <self_collide>0</self_collide>
-      <kinematic>0</kinematic>
-      <velocity_decay/>
-      <visual name='rotor_2_visual'>
-        <pose frame=''>0 0 0 0 -0 0</pose>
-        <geometry>
-          <mesh>
-            <scale>1 1 1</scale>
-            <uri>model://rotors_description/meshes/iris_prop_cw.dae</uri>
-          </mesh>
-        </geometry>
-        <material>
-          <script>
-            <name>Gazebo/Green</name>
-            <uri>file://media/materials/scripts/gazebo.material</uri>
-          </script>
-          <ambient>0 1 0 1</ambient>
-          <diffuse>0 1 0 1</diffuse>
-          <specular>0.1 0.1 0.1 1</specular>
-          <emissive>0 0 0 1</emissive>
-          <shader type='pixel'/>
-        </material>
-        <cast_shadows>1</cast_shadows>
-        <transparency>0</transparency>
-      </visual>
-      <collision name='rotor_2_collision'>
-        <laser_retro>0</laser_retro>
-        <max_contacts>10</max_contacts>
-        <pose frame=''>0 0 0 0 -0 0</pose>
-        <geometry>
-          <cylinder>
-            <radius>0.128</radius>
-            <length>0.005</length>
-          </cylinder>
-        </geometry>
-        <surface>
-          <friction>
-            <ode>
-              <mu>1</mu>
-              <mu2>1</mu2>
-              <fdir1>0 0 0</fdir1>
-              <slip1>0</slip1>
-              <slip2>0</slip2>
-            </ode>
-          </friction>
-          <bounce>
-            <restitution_coefficient>0</restitution_coefficient>
-            <threshold>1e+06</threshold>
-          </bounce>
-          <contact>
-            <collide_without_contact>0</collide_without_contact>
-            <collide_without_contact_bitmask>1</collide_without_contact_bitmask>
-            <collide_bitmask>1</collide_bitmask>
-            <ode>
-              <soft_cfm>0</soft_cfm>
-              <soft_erp>0.2</soft_erp>
-              <kp>1e+13</kp>
-              <kd>1</kd>
-              <max_vel>0.01</max_vel>
-              <min_depth>0</min_depth>
-            </ode>
-            <bullet>
-              <split_impulse>1</split_impulse>
-              <split_impulse_penetration_threshold>-0.01</split_impulse_penetration_threshold>
-              <soft_cfm>0</soft_cfm>
-              <soft_erp>0.2</soft_erp>
-              <kp>1e+13</kp>
-              <kd>1</kd>
-            </bullet>
-          </contact>
-        </surface>
-      </collision>
-    </link>
-    <link name='rotor_3'>
-      <pose frame=''>-0.159 -0.159 0.11 0 -0 0</pose>
-      <inertial>
-        <pose frame=''>0 0 0 0 -0 0</pose>
-        <mass>0.005</mass>
-        <inertia>
-          <ixx>9.75e-07</ixx>
-          <ixy>0</ixy>
-          <ixz>0</ixz>
-          <iyy>0.000273104</iyy>
-          <iyz>0</iyz>
-          <izz>0.000274004</izz>
-        </inertia>
-      </inertial>
-      <self_collide>0</self_collide>
-      <kinematic>0</kinematic>
-      <velocity_decay/>
-      <visual name='rotor_3_visual'>
-        <pose frame=''>0 0 0 0 -0 0</pose>
-        <geometry>
-          <mesh>
-            <scale>1 1 1</scale>
-            <uri>model://rotors_description/meshes/iris_prop_cw.dae</uri>
-          </mesh>
-        </geometry>
-        <material>
-          <script>
-            <name>Gazebo/Red</name>
-            <uri>file://media/materials/scripts/gazebo.material</uri>
-          </script>
-          <ambient>1 0 0 1</ambient>
-          <diffuse>1 0 0 1</diffuse>
-          <specular>0.1 0.1 0.1 1</specular>
-          <emissive>0 0 0 1</emissive>
-          <shader type='pixel'/>
-        </material>
-        <cast_shadows>1</cast_shadows>
-        <transparency>0</transparency>
-      </visual>
-      <collision name='rotor_3_collision'>
-        <laser_retro>0</laser_retro>
-        <max_contacts>10</max_contacts>
-        <pose frame=''>0 0 0 0 -0 0</pose>
-        <geometry>
-          <cylinder>
-            <radius>0.128</radius>
-            <length>0.005</length>
-          </cylinder>
-        </geometry>
-        <surface>
-          <friction>
-            <ode>
-              <mu>1</mu>
-              <mu2>1</mu2>
-              <fdir1>0 0 0</fdir1>
-              <slip1>0</slip1>
-              <slip2>0</slip2>
-            </ode>
-          </friction>
-          <bounce>
-            <restitution_coefficient>0</restitution_coefficient>
-            <threshold>1e+06</threshold>
-          </bounce>
-          <contact>
-            <collide_without_contact>0</collide_without_contact>
-            <collide_without_contact_bitmask>1</collide_without_contact_bitmask>
-            <collide_bitmask>1</collide_bitmask>
-            <ode>
-              <soft_cfm>0</soft_cfm>
-              <soft_erp>0.2</soft_erp>
-              <kp>1e+13</kp>
-              <kd>1</kd>
-              <max_vel>0.01</max_vel>
-              <min_depth>0</min_depth>
-            </ode>
-            <bullet>
-              <split_impulse>1</split_impulse>
-              <split_impulse_penetration_threshold>-0.01</split_impulse_penetration_threshold>
-              <soft_cfm>0</soft_cfm>
-              <soft_erp>0.2</soft_erp>
-              <kp>1e+13</kp>
-              <kd>1</kd>
-            </bullet>
-          </contact>
-        </surface>
-      </collision>
-    </link>
-    <joint name='/imu_joint' type='revolute'>
-      <parent>base_link</parent>
-      <child>/imu_link</child>
-      <axis>
-        <xyz>1 0 0</xyz>
-        <use_parent_model_frame>1</use_parent_model_frame>
-        <limit>
-          <lower>0</lower>
-          <upper>0</upper>
-          <effort>0</effort>
-          <velocity>0</velocity>
-        </limit>
-        <dynamics>
-          <spring_reference>0</spring_reference>
-          <spring_stiffness>0</spring_stiffness>
-          <damping>0</damping>
-          <friction>0</friction>
-        </dynamics>
-      </axis>
-      <physics>
-        <ode>
-          <limit>
-            <cfm>0</cfm>
-            <erp>0.2</erp>
-          </limit>
-          <suspension>
-            <cfm>0</cfm>
-            <erp>0.2</erp>
-          </suspension>
-        </ode>
-      </physics>
-    </joint>
-
-    <joint name='f450/down_cam_joint' type='revolute'>
-      <parent>base_link</parent>
-      <child>f450/robot_camera_down</child>
-      <axis>
-        <xyz>1 0 0</xyz>
-        <use_parent_model_frame>1</use_parent_model_frame>
-        <limit>
-          <lower>0</lower>
-          <upper>0</upper>
-          <effort>0</effort>
-          <velocity>0</velocity>
-        </limit>
-        <dynamics>
-          <spring_reference>0</spring_reference>
-          <spring_stiffness>0</spring_stiffness>
-          <damping>0</damping>
-          <friction>0</friction>
-        </dynamics>
-      </axis>
-      <physics>
-        <ode>
-          <limit>
-            <cfm>0</cfm>
-            <erp>0.2</erp>
-          </limit>
-          <suspension>
-            <cfm>0</cfm>
-            <erp>0.2</erp>
-          </suspension>
-        </ode>
-      </physics>
-    </joint>
-    <joint name='f450/down_sonar_joint' type='revolute'>
-      <parent>base_link</parent>
-      <child>f450/robot_sonar_down</child>
-      <axis>
-        <xyz>1 0 0</xyz>
-        <use_parent_model_frame>1</use_parent_model_frame>
-        <limit>
-          <lower>0</lower>
-          <upper>0</upper>
-          <effort>0</effort>
-          <velocity>0</velocity>
-        </limit>
-        <dynamics>
-          <spring_reference>0</spring_reference>
-          <spring_stiffness>0</spring_stiffness>
-          <damping>0</damping>
-          <friction>0</friction>
-        </dynamics>
-      </axis>
-      <physics>
-        <ode>
-          <limit>
-            <cfm>0</cfm>
-            <erp>0.2</erp>
-          </limit>
-          <suspension>
-            <cfm>0</cfm>
-            <erp>0.2</erp>
-          </suspension>
-        </ode>
-      </physics>
-    </joint>
-    <joint name='f450/front_cam_joint' type='revolute'>
-      <parent>base_link</parent>
-      <child>f450/robot_camera</child>
-      <axis>
-        <xyz>1 0 0</xyz>
-        <use_parent_model_frame>1</use_parent_model_frame>
-        <limit>
-          <lower>0</lower>
-          <upper>0</upper>
-          <effort>0</effort>
-          <velocity>0</velocity>
-        </limit>
-        <dynamics>
-          <spring_reference>0</spring_reference>
-          <spring_stiffness>0</spring_stiffness>
-          <damping>0</damping>
-          <friction>0</friction>
-        </dynamics>
-      </axis>
-      <physics>
-        <ode>
-          <limit>
-            <cfm>0</cfm>
-            <erp>0.2</erp>
-          </limit>
-          <suspension>
-            <cfm>0</cfm>
-            <erp>0.2</erp>
-          </suspension>
-        </ode>
-      </physics>
-    </joint>
-    <joint name='rotor_0_joint' type='revolute'>
-      <parent>base_link</parent>
-      <child>rotor_0</child>
-      <axis>
-        <xyz>0 0 1</xyz>
-        <use_parent_model_frame>1</use_parent_model_frame>
-        <limit>
-          <lower>-1e+16</lower>
-          <upper>1e+16</upper>
-          <effort>-1</effort>
-          <velocity>-1</velocity>
-        </limit>
-        <dynamics>
-          <spring_reference>0</spring_reference>
-          <spring_stiffness>0</spring_stiffness>
-          <damping>0</damping>
-          <friction>0</friction>
-        </dynamics>
-      </axis>
-      <physics>
-        <ode>
-          <limit>
-            <cfm>0</cfm>
-            <erp>0.2</erp>
-          </limit>
-          <suspension>
-            <cfm>0</cfm>
-            <erp>0.2</erp>
-          </suspension>
-        </ode>
-      </physics>
-    </joint>
-    <joint name='rotor_1_joint' type='revolute'>
-      <parent>base_link</parent>
-      <child>rotor_1</child>
-      <axis>
-        <xyz>0 0 1</xyz>
-        <use_parent_model_frame>1</use_parent_model_frame>
-        <limit>
-          <lower>-1e+16</lower>
-          <upper>1e+16</upper>
-          <effort>-1</effort>
-          <velocity>-1</velocity>
-        </limit>
-        <dynamics>
-          <spring_reference>0</spring_reference>
-          <spring_stiffness>0</spring_stiffness>
-          <damping>0</damping>
-          <friction>0</friction>
-        </dynamics>
-      </axis>
-      <physics>
-        <ode>
-          <limit>
-            <cfm>0</cfm>
-            <erp>0.2</erp>
-          </limit>
-          <suspension>
-            <cfm>0</cfm>
-            <erp>0.2</erp>
-          </suspension>
-        </ode>
-      </physics>
-    </joint>
-    <joint name='rotor_2_joint' type='revolute'>
-      <parent>base_link</parent>
-      <child>rotor_2</child>
-      <axis>
-        <xyz>0 0 1</xyz>
-        <use_parent_model_frame>1</use_parent_model_frame>
-        <limit>
-          <lower>-1e+16</lower>
-          <upper>1e+16</upper>
-          <effort>-1</effort>
-          <velocity>-1</velocity>
-        </limit>
-        <dynamics>
-          <spring_reference>0</spring_reference>
-          <spring_stiffness>0</spring_stiffness>
-          <damping>0</damping>
-          <friction>0</friction>
-        </dynamics>
-      </axis>
-      <physics>
-        <ode>
-          <limit>
-            <cfm>0</cfm>
-            <erp>0.2</erp>
-          </limit>
-          <suspension>
-            <cfm>0</cfm>
-            <erp>0.2</erp>
-          </suspension>
-        </ode>
-      </physics>
-    </joint>
-    <joint name='rotor_3_joint' type='revolute'>
-      <parent>base_link</parent>
-      <child>rotor_3</child>
-      <axis>
-        <xyz>0 0 1</xyz>
-        <use_parent_model_frame>1</use_parent_model_frame>
-        <limit>
-          <lower>-1e+16</lower>
-          <upper>1e+16</upper>
-          <effort>-1</effort>
-          <velocity>-1</velocity>
-        </limit>
-        <dynamics>
-          <spring_reference>0</spring_reference>
-          <spring_stiffness>0</spring_stiffness>
-          <damping>0</damping>
-          <friction>0</friction>
-        </dynamics>
-      </axis>
-      <physics>
-        <ode>
-          <limit>
-            <cfm>0</cfm>
-            <erp>0.2</erp>
-          </limit>
-          <suspension>
-            <cfm>0</cfm>
-            <erp>0.2</erp>
-          </suspension>
-        </ode>
-      </physics>
-    </joint>
-    <static>0</static>
-    <allow_auto_disable>1</allow_auto_disable>
-    <plugin name='rosbag' filename='librotors_gazebo_multirotor_base_plugin.so'>
-      <robotNamespace/>
-      <linkName>base_link</linkName>
-      <rotorVelocitySlowdownSim>10</rotorVelocitySlowdownSim>
-    </plugin>
-    <plugin name='front_right_motor_model' filename='librotors_gazebo_motor_model.so'>
-      <robotNamespace/>
-      <jointName>rotor_0_joint</jointName>
-      <linkName>rotor_0</linkName>
-      <turningDirection>ccw</turningDirection>
-      <timeConstantUp>0.0125</timeConstantUp>
-      <timeConstantDown>0.025</timeConstantDown>
-      <maxRotVelocity>1100</maxRotVelocity>
-      <motorConstant>8.54858e-06</motorConstant>
-      <momentConstant>0.06</momentConstant>
-      <commandSubTopic>/gazebo/command/motor_speed</commandSubTopic>
-      <motorNumber>0</motorNumber>
-      <rotorDragCoefficient>0.000806428</rotorDragCoefficient>
-      <rollingMomentCoefficient>1e-06</rollingMomentCoefficient>
-      <motorSpeedPubTopic>/motor_speed/0</motorSpeedPubTopic>
-      <rotorVelocitySlowdownSim>10</rotorVelocitySlowdownSim>
-    </plugin>
-    <plugin name='back_left_motor_model' filename='librotors_gazebo_motor_model.so'>
-      <robotNamespace/>
-      <jointName>rotor_1_joint</jointName>
-      <linkName>rotor_1</linkName>
-      <turningDirection>ccw</turningDirection>
-      <timeConstantUp>0.0125</timeConstantUp>
-      <timeConstantDown>0.025</timeConstantDown>
-      <maxRotVelocity>1100</maxRotVelocity>
-      <motorConstant>8.54858e-06</motorConstant>
-      <momentConstant>0.06</momentConstant>
-      <commandSubTopic>/gazebo/command/motor_speed</commandSubTopic>
-      <motorNumber>1</motorNumber>
-      <rotorDragCoefficient>0.000806428</rotorDragCoefficient>
-      <rollingMomentCoefficient>1e-06</rollingMomentCoefficient>
-      <motorSpeedPubTopic>/motor_speed/1</motorSpeedPubTopic>
-      <rotorVelocitySlowdownSim>10</rotorVelocitySlowdownSim>
-    </plugin>
-    <plugin name='front_left_motor_model' filename='librotors_gazebo_motor_model.so'>
-      <robotNamespace/>
-      <jointName>rotor_2_joint</jointName>
-      <linkName>rotor_2</linkName>
-      <turningDirection>cw</turningDirection>
-      <timeConstantUp>0.0125</timeConstantUp>
-      <timeConstantDown>0.025</timeConstantDown>
-      <maxRotVelocity>1100</maxRotVelocity>
-      <motorConstant>8.54858e-06</motorConstant>
-      <momentConstant>0.06</momentConstant>
-      <commandSubTopic>/gazebo/command/motor_speed</commandSubTopic>
-      <motorNumber>2</motorNumber>
-      <rotorDragCoefficient>0.000806428</rotorDragCoefficient>
-      <rollingMomentCoefficient>1e-06</rollingMomentCoefficient>
-      <motorSpeedPubTopic>/motor_speed/2</motorSpeedPubTopic>
-      <rotorVelocitySlowdownSim>10</rotorVelocitySlowdownSim>
-    </plugin>
-    <plugin name='back_right_motor_model' filename='librotors_gazebo_motor_model.so'>
-      <robotNamespace/>
-      <jointName>rotor_3_joint</jointName>
-      <linkName>rotor_3</linkName>
-      <turningDirection>cw</turningDirection>
-      <timeConstantUp>0.0125</timeConstantUp>
-      <timeConstantDown>0.025</timeConstantDown>
-      <maxRotVelocity>1100</maxRotVelocity>
-      <motorConstant>8.54858e-06</motorConstant>
-      <momentConstant>0.06</momentConstant>
-      <commandSubTopic>/gazebo/command/motor_speed</commandSubTopic>
-      <motorNumber>3</motorNumber>
-      <rotorDragCoefficient>0.000806428</rotorDragCoefficient>
-      <rollingMomentCoefficient>1e-06</rollingMomentCoefficient>
-      <motorSpeedPubTopic>/motor_speed/3</motorSpeedPubTopic>
-      <rotorVelocitySlowdownSim>10</rotorVelocitySlowdownSim>
-    </plugin>
-    <plugin name='mavlink_interface' filename='librotors_gazebo_mavlink_interface.so'>
-      <robotNamespace/>
-      <imuSubTopic>/imu</imuSubTopic>
-      <mavlink_addr>INADDR_ANY</mavlink_addr>
-      <mavlink_udp_port>14560</mavlink_udp_port>
-      <motorSpeedCommandPubTopic>/gazebo/command/motor_speed</motorSpeedCommandPubTopic>
-      <control_channels>
-        <channel name='rotor1'>
-          <input_index>0</input_index>
-          <input_offset>1</input_offset>
-          <input_scaling>550</input_scaling>
-          <zero_position_disarmed>0</zero_position_disarmed>
-          <zero_position_armed>100</zero_position_armed>
-          <joint_control_type>velocity</joint_control_type>
-        </channel>
-        <channel name='rotor2'>
-          <input_index>1</input_index>
-          <input_offset>1</input_offset>
-          <input_scaling>550</input_scaling>
-          <zero_position_disarmed>0</zero_position_disarmed>
-          <zero_position_armed>100</zero_position_armed>
-          <joint_control_type>velocity</joint_control_type>
-        </channel>
-        <channel name='rotor3'>
-          <input_index>2</input_index>
-          <input_offset>1</input_offset>
-          <input_scaling>550</input_scaling>
-          <zero_position_disarmed>0</zero_position_disarmed>
-          <zero_position_armed>100</zero_position_armed>
-          <joint_control_type>velocity</joint_control_type>
-        </channel>
-        <channel name='rotor4'>
-          <input_index>3</input_index>
-          <input_offset>1</input_offset>
-          <input_scaling>550</input_scaling>
-          <zero_position_disarmed>0</zero_position_disarmed>
-          <zero_position_armed>100</zero_position_armed>
-          <joint_control_type>velocity</joint_control_type>
-        </channel>
-        <channel name='rotor5'>
-          <input_index>4</input_index>
-          <input_offset>1</input_offset>
-          <input_scaling>324.6</input_scaling>
-          <zero_position_disarmed>0</zero_position_disarmed>
-          <zero_position_armed>0</zero_position_armed>
-          <joint_control_type>velocity</joint_control_type>
-          <joint_control_pid>
-            <p>0.1</p>
-            <i>0</i>
-            <d>0</d>
-            <iMax>0.0</iMax>
-            <iMin>0.0</iMin>
-            <cmdMax>2</cmdMax>
-            <cmdMin>-2</cmdMin>
-          </joint_control_pid>
-          <joint_name>zephyr_delta_wing::propeller_joint</joint_name>
-        </channel>
-        <channel name='rotor6'>
-          <input_index>5</input_index>
-          <input_offset>0</input_offset>
-          <input_scaling>0.524</input_scaling>
-          <zero_position_disarmed>0</zero_position_disarmed>
-          <zero_position_armed>0</zero_position_armed>
-          <joint_control_type>position</joint_control_type>
-          <joint_name>zephyr_delta_wing::flap_left_joint</joint_name>
-          <joint_control_pid>
-            <p>10.0</p>
-            <i>0</i>
-            <d>0</d>
-            <iMax>0</iMax>
-            <iMin>0</iMin>
-            <cmdMax>20</cmdMax>
-            <cmdMin>-20</cmdMin>
-          </joint_control_pid>
-        </channel>
-        <channel name='rotor7'>
-          <input_index>6</input_index>
-          <input_offset>0</input_offset>
-          <input_scaling>0.524</input_scaling>
-          <zero_position_disarmed>0</zero_position_disarmed>
-          <zero_position_armed>0</zero_position_armed>
-          <joint_control_type>position</joint_control_type>
-          <joint_name>zephyr_delta_wing::flap_right_joint</joint_name>
-          <joint_control_pid>
-            <p>10.0</p>
-            <i>0</i>
-            <d>0</d>
-            <iMax>0</iMax>
-            <iMin>0</iMin>
-            <cmdMax>20</cmdMax>
-            <cmdMin>-20</cmdMin>
-          </joint_control_pid>
-        </channel>
-        <channel name='rotor8'>
-          <input_index>7</input_index>
-          <input_offset>0</input_offset>
-          <input_scaling>0.524</input_scaling>
-          <zero_position_disarmed>0</zero_position_disarmed>
-          <zero_position_armed>0</zero_position_armed>
-          <joint_control_type>position</joint_control_type>
-        </channel>
-      </control_channels>
-    </plugin>
-    <plugin name='rotors_gazebo_imu_plugin' filename='librotors_gazebo_imu_plugin.so'>
-      <robotNamespace/>
-      <linkName>/imu_link</linkName>
-      <imuTopic>/imu</imuTopic>
-      <gyroscopeNoiseDensity>0.0003394</gyroscopeNoiseDensity>
-      <gyroscopeRandomWalk>3.8785e-05</gyroscopeRandomWalk>
-      <gyroscopeBiasCorrelationTime>1000.0</gyroscopeBiasCorrelationTime>
-      <gyroscopeTurnOnBiasSigma>0.0087</gyroscopeTurnOnBiasSigma>
-      <accelerometerNoiseDensity>0.004</accelerometerNoiseDensity>
-      <accelerometerRandomWalk>0.006</accelerometerRandomWalk>
-      <accelerometerBiasCorrelationTime>300.0</accelerometerBiasCorrelationTime>
-      <accelerometerTurnOnBiasSigma>0.196</accelerometerTurnOnBiasSigma>
-    </plugin>
-
-<!-- #################################### HOKUYO SENSOR ############################################-->	
-
-	<!-- Hokuyo Laser -->
-  	<link name="hokuyo_link">
-    		<inertial>
-        		<mass>0.01</mass>
-        		<inertia>
-          			<ixx>0.01</ixx>
-				<ixy>0</ixy>
-				<ixz>0</ixz>
-				<iyy>0.01</iyy>
-				<iyz>0</iyz>
-				<izz>0.01</izz>
-        		</inertia>
-      		</inertial>
-
-		<visual name="visual">
-			<pose> 0.03 -0.035 0.105 1.57 0 3.14</pose>        
-			<geometry>
-        			<mesh>
-        				<scale>0.0005 0.0005 0.0005</scale>
-        				<uri>model://hokuyo/meshes/TOWER.STL</uri>
-        			</mesh>
-        		</geometry>
-        		<material>
-          			<script>
-            			<name>Gazebo/DarkGrey</name>
-            			<uri>file://media/materials/scripts/gazebo.material</uri>
-          			</script>
-        		</material>
-        	</visual>
-        	
-<!-- ################################# HOKUYO PLUGIN #################################################-->
-
-        	<sensor type="ray" name="laser">
-        		<pose>-0.005 -0.00 0.125 0 0 0</pose>
-        		<visualize>true</visualize>
-        		<update_rate>10</update_rate>
-            		<ray>
-                		<scan>
-                    			<horizontal>
-                        			<samples>3</samples>
-                        			<resolution>1</resolution>
-                        			<min_angle>-1.57</min_angle>
-                        			<max_angle>1.57</max_angle>
-                    			</horizontal>
-                		</scan>
-                		<range>
-                    			<min>0.20</min>
-                    			<max>7.0</max>
-                    			<resolution>0.01</resolution>
-                		</range>
-                		<noise>
-                    			<type>gaussian</type>
-                    			<mean>0.0</mean>
-                    			<stddev>0.01</stddev>
-                		</noise>
-            		</ray>
-
-            		<plugin name="link_laser_controller" filename="libgazebo_ros_laser.so">	
-                		<topicName>laser_scan</topicName>
-                		<frameName>hokuyo_link</frameName>
-            		</plugin>
-        	</sensor>
-	</link>
-	<joint name='lidar_joint' type='fixed'>
-      	<child>hokuyo_link</child>
-      	<parent>base_link</parent>
-	</joint>
-<! #################################### HOKUYO SENSOR (GROUND) ############################################-->	
-
-	<!-- Hokuyo Laser -->
-  	<link name="hokuyo_link_2">
-    		<inertial>
-        		<mass>0.01</mass>
-        		<inertia>
-          			<ixx>0.01</ixx>
-				<ixy>0</ixy>
-				<ixz>0</ixz>
-				<iyy>0.01</iyy>
-				<iyz>0</iyz>
-				<izz>0.01</izz>
-        		</inertia>
-      		</inertial>
-      		
-      		<visual name="visualground">
-			<pose> 0.27 -0.024 0.045 -1.57 0 1.57</pose>        
-			<geometry>
-        			<mesh>
-        				<scale>0.001 0.001 0.001</scale>
-        				<uri>model://hokuyo/meshes/LIDAR.STL</uri>
-        			</mesh>
-        		</geometry>
-        		<material>
-          			<script>
-            			<name>Gazebo/DarkGrey</name>
-            			<uri>file://media/materials/scripts/gazebo.material</uri>
-          			</script>
-        		</material>
-        	</visual>
-<! ################################# HOKUYO PLUGIN #################################################-->
-
-        	<sensor type="ray" name="laser">
-        		<pose>0.265 0 0 0 1.57 3.14</pose>
-        		<visualize>true</visualize>
-        		<update_rate>10</update_rate>
-            		<ray>
-                		<scan>
-                    			<horizontal>
-                        			<samples>3</samples>
-                        			<resolution>1</resolution>
-                        			<min_angle>-0.005</min_angle>
-                        			<max_angle>0.005</max_angle>
-                    			</horizontal>
-                		</scan>
-                		<range>
-                    			<min>0.01</min>
-                    			<max>40.0</max>
-                    			<resolution>0.01</resolution>
-                		</range>
-                		<noise>
-                    			<type>gaussian</type>
-                    			<mean>0.0</mean>
-                    			<stddev>0.01</stddev>
-                		</noise>
-            		</ray>
-
-            		<plugin name="link_laser_controller" filename="libgazebo_ros_laser.so">	
-                		<topicName>laser_height</topicName>
-                		<frameName>hokuyo_link</frameName>
-            		</plugin>
-        	</sensor>
-	</link>
-	<joint name='lidar_ground_joint' type='fixed'>
-      	<child>hokuyo_link_2</child>
-      	<parent>base_link</parent>
-	</joint>
-
-
-  </model>
-</sdf>