Add models for Skywalker X8 plane and quad-plane

config/skywalker_x8.parm

@@ -0,0 +1,33 @@
+ARMING_RUDDER    0
+ARSPD_TYPE       0
+PTCH2SRV_RLL     1.000000
+PTCH2SRV_RMAX_DN 75
+PTCH2SRV_RMAX_UP 75
+PTCH2SRV_TCONST  0.750000
+PTCH_RATE_D      0.003699
+PTCH_RATE_FF     0.403978
+PTCH_RATE_FLTD   10.000000
+PTCH_RATE_FLTE   0.000000
+PTCH_RATE_FLTT   2.122066
+PTCH_RATE_I      0.403978
+PTCH_RATE_IMAX   0.666000
+PTCH_RATE_P      0.232641
+PTCH_RATE_SMAX   150.000000
+RLL2SRV_RMAX     75
+RLL2SRV_TCONST   0.500000
+RLL_RATE_D       0.002845
+RLL_RATE_FF      0.181866
+RLL_RATE_FLTD    10.000000
+RLL_RATE_FLTE    0.000000
+RLL_RATE_FLTT    3.183099
+RLL_RATE_I       0.181866
+RLL_RATE_IMAX    0.666000
+RLL_RATE_P       0.096396
+RLL_RATE_SMAX    150.000000
+SERVO1_FUNCTION  77
+SERVO2_FUNCTION  78
+SERVO3_MAX       2000
+SERVO3_MIN       1000
+SERVO3_TRIM      1000
+WP_LOITER_RAD    30.000000
+WP_RADIUS        30.000000

config/skywalker_x8_quad.parm

@@ -0,0 +1,40 @@
+ARMING_RUDDER    0
+ARSPD_TYPE       0
+PTCH2SRV_RLL     1.000000
+PTCH2SRV_RMAX_DN 75
+PTCH2SRV_RMAX_UP 75
+PTCH2SRV_TCONST  0.750000
+PTCH_RATE_D      0.003699
+PTCH_RATE_FF     0.403978
+PTCH_RATE_FLTD   10.000000
+PTCH_RATE_FLTE   0.000000
+PTCH_RATE_FLTT   2.122066
+PTCH_RATE_I      0.403978
+PTCH_RATE_IMAX   0.666000
+PTCH_RATE_P      0.232641
+PTCH_RATE_SMAX   150.000000
+RLL2SRV_RMAX     75
+RLL2SRV_TCONST   0.500000
+RLL_RATE_D       0.002845
+RLL_RATE_FF      0.181866
+RLL_RATE_FLTD    10.000000
+RLL_RATE_FLTE    0.000000
+RLL_RATE_FLTT    3.183099
+RLL_RATE_I       0.181866
+RLL_RATE_IMAX    0.666000
+RLL_RATE_P       0.096396
+RLL_RATE_SMAX    150.000000
+SERVO1_FUNCTION  77
+SERVO2_FUNCTION  78
+SERVO3_MAX       2000
+SERVO3_MIN       1000
+SERVO3_TRIM      1000
+WP_LOITER_RAD    30.000000
+WP_RADIUS        30.000000
+WP_RADIUS        30.000000
+Q_ENABLE         1
+Q_ASSIST_SPEED   10
+Q_FRAME_CLASS    1
+Q_FRAME_TYPE     3
+Q_A_RAT_RLL_P    0.25
+Q_A_RAT_PIT_P    0.25

models/runway/model.sdf

@@ -34,7 +34,7 @@
         </material>
       </visual>
       <visual name="airfield">
-        <pose>0 0 -0.5 0 0 0</pose>
+        <pose>0 0 -0.001 0 0 0</pose>
         <cast_shadows>false</cast_shadows>
         <geometry>
           <mesh>

models/skywalker_x8/model.config

@@ -0,0 +1,20 @@
+<?xml version="1.0"?>
+<model>
+  <name>Skywalker X8</name>
+  <version>1.0</version>
+  <sdf version='1.7'>model.sdf</sdf>
+
+  <author>
+    <name>Roman Bapst</name>
+    <email>roman@px4.io</email>
+  </author>
+
+  <author>
+    <name>Rhys Mainwaring</name>
+    <email>rhys.mainwaring@me.com</email>
+  </author>
+
+  <description>
+    This is a model of a Skywalker X8 plane with ArduPilot integration.
+  </description>
+</model>