diff --git a/README.md b/README.md
index 5197c67..b1709e2 100644
--- a/README.md
+++ b/README.md
@@ -13,6 +13,7 @@ users to build their own multicopters. It was a research project led by the
 ![](docs/vtail_simulate.jpg)
 ![](docs/y6_simulate.jpg)
 ![](docs/windows_default_ui.jpg)
+![](docs/demo_simulate.jpg)
 
 Please refer to [docs/user_guide.pdf](docs/user_guide.pdf) for more
 information.
diff --git a/docs/demo_simulate.jpg b/docs/demo_simulate.jpg
new file mode 100644
index 0000000..70b73e1
Binary files /dev/null and b/docs/demo_simulate.jpg differ
diff --git a/resources/copter/demo.xml b/resources/copter/demo.xml
new file mode 100644
index 0000000..141cffa
--- /dev/null
+++ b/resources/copter/demo.xml
@@ -0,0 +1,138 @@
+<?xml version="1.0" ?>
+<copter>
+  <plate file="circular_plate.obj" density="1180.0">
+    <instance size="0.18 0.18">
+      <!-- Lift by 0.1m to avoid penetrating the ground. -->
+      <translate xyz="0 0 -0.1"/>
+    </instance>
+    <instance size="0.18 0.18">
+      <translate xyz="0 0 -0.1"/>
+      <!-- 0.0024m is the thickness of the plate. -->
+      <translate xyz="0 0 -0.0024"/>
+      <!-- 0.0456m is the size of the connector. -->
+      <translate xyz="0 0 -0.0456"/>
+    </instance>
+  </plate>
+
+  <battery file="battery.obj" density="2857.1" capacity="2200">
+    <translate xyz="0 0 -0.1"/>
+    <translate xyz="0 0 0.0024"/>
+    <translate xyz="0 -0.045 0.025"/>
+  </battery>
+
+  <electronics file="electronics.obj" density="601.6">
+    <!-- The electronic device is placed on top of the upper plate. -->
+    <translate xyz="0 0 -0.148"/>
+    <!-- Lift by 0.01 more because the mesh itself has thickness. -->
+    <translate xyz="0 0 -0.01"/>
+  </electronics>
+
+  <tube file="tube.obj" density="1638.9">
+    <instance length="0.2">
+      <translate xyz="0 0 -0.1"/>
+      <!-- 0.0012 is half of the thickness of a plate. -->
+      <translate xyz="0 0 -0.0012"/>
+      <!-- 0.0228 is half of the size of a connector. -->
+      <translate xyz="0 0 -0.0228"/>
+      <translate xyz="0.15 0 0"/>
+    </instance>
+    <instance length="0.2">
+      <translate xyz="0.15 0 -0.124"/>
+      <rotate rpy="0 0 72"/>
+    </instance>
+    <instance length="0.2">
+      <translate xyz="0.15 0 -0.124"/>
+      <rotate rpy="0 0 144"/>
+    </instance>
+    <instance length="0.2">
+      <translate xyz="0.15 0 -0.124"/>
+      <rotate rpy="0 0 -144"/>
+    </instance>
+    <instance length="0.2">
+      <translate xyz="0.15 0 -0.124"/>
+      <rotate rpy="0 0 -72"/>
+    </instance>
+  </tube>
+
+  <round_connector file="connector.obj" density="1170.0">
+    <instance>
+      <translate xyz="0.07 0 -0.124"/>
+    </instance>
+    <instance>
+      <translate xyz="0.07 0 -0.124"/>
+      <rotate rpy="0 0 72"/>
+    </instance>
+    <instance>
+      <translate xyz="0.07 0 -0.124"/>
+      <rotate rpy="0 0 144"/>
+    </instance>
+    <instance>
+      <translate xyz="0.07 0 -0.124"/>
+      <rotate rpy="0 0 -144"/>
+    </instance>
+    <instance>
+      <translate xyz="0.07 0 -0.124"/>
+      <rotate rpy="0 0 -72"/>
+    </instance>
+
+    <instance>
+      <translate xyz="0.23 0 -0.124"/>
+    </instance>
+    <instance>
+      <translate xyz="0.23 0 -0.124"/>
+      <rotate rpy="0 0 72"/>
+    </instance>
+    <instance>
+      <translate xyz="0.23 0 -0.124"/>
+      <rotate rpy="0 0 144"/>
+    </instance>
+    <instance>
+      <translate xyz="0.23 0 -0.124"/>
+      <rotate rpy="0 0 -144"/>
+    </instance>
+    <instance>
+      <translate xyz="0.23 0 -0.124"/>
+      <rotate rpy="0 0 -72"/>
+    </instance>
+  </round_connector>
+
+  <propeller file="propeller_10inch.obj"/>
+
+  <motor file="motor.obj" density="4833.3" measurement="motor_10inch_prop.txt"
+    propeller_height="0.019">
+    <instance spin_dir="cw">
+      <!-- Location of its parent connector. -->
+      <translate xyz="0.23 0 -0.124"/>
+      <!-- Half size of its parent connector. -->
+      <translate xyz="0 0 -0.0228"/>
+      <!-- 0.018 is the distance between the bottom surface and the center of
+           the motor. -->
+      <translate xyz="0 0 -0.018"/>
+    </instance>
+    <instance spin_dir="cw">
+      <translate xyz="0.23 0 -0.124"/>
+      <translate xyz="0 0 -0.0228"/>
+      <translate xyz="0 0 -0.018"/>
+      <rotate rpy="0 0 72"/>
+    </instance>
+    <instance spin_dir="ccw">
+      <translate xyz="0.23 0 -0.124"/>
+      <translate xyz="0 0 -0.0228"/>
+      <translate xyz="0 0 -0.018"/>
+      <rotate rpy="0 0 144"/>
+    </instance>
+    <instance spin_dir="cw">
+      <translate xyz="0.23 0 -0.124"/>
+      <translate xyz="0 0 -0.0228"/>
+      <translate xyz="0 0 -0.018"/>
+      <rotate rpy="0 0 -144"/>
+    </instance>
+    <instance spin_dir="ccw">
+      <translate xyz="0.23 0 -0.124"/>
+      <translate xyz="0 0 -0.0228"/>
+      <translate xyz="0 0 -0.018"/>
+      <rotate rpy="0 0 -72"/>
+    </instance>
+  </motor>
+
+</copter>
\ No newline at end of file
diff --git a/resources/mesh/circular_plate.obj b/resources/mesh/circular_plate.obj
new file mode 100644
index 0000000..44a21ed
--- /dev/null
+++ b/resources/mesh/circular_plate.obj
@@ -0,0 +1,882 @@
+####
+#
+# OBJ File Generated by Meshlab
+#
+####
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+#
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+#
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+
+# End of File