fgdata/Aircraft/c172p/Systems/ground-effects.xml

<?xml version="1.0" encoding="UTF-8"?>
<!-- (c) 2015, wlbragg. http://forum.flightgear.org/viewtopic.php?f=4&t=25157&start=75#p232085
Under the GPL. Used by shadows under ALS -->
<PropertyList>

	<filter>
      <type>gain</type>
      <gain>0.3048</gain>
      <input>/position/altitude-agl-ft</input>
      <reference>-.75</reference>
	  <output>/position/gear-agl-m</output>
   </filter>

   <filter>
      <type>gain</type>
      <gain>0.3048</gain>
      <input>/position/altitude-agl-ft</input>
      <reference>1.0</reference>
      <output>/position/altitude-agl-m</output>
   </filter>

    <!-- This filter is used to passthrough a value in non-replay mode.
         In replay mode, the value from the flight recorder is used.
         This filter is needed because JSBSim wins over the flight recorder.
    -->
    <filter>
        <name>Spray and Wakes Effect for Pontoons</name>
        <type>gain</type>
        <enable>
            <condition>
                <not>
                    <property>/sim/freeze/replay-state</property>
                </not>
            </condition>
        </enable>
        <input>
            <property>/fdm/jsbsim/hydro/spray-wake-speed-kt</property>
        </input>
        <output>
            <property>/fdm/jsbsim/hydro/spray-wake-speed-kt-actual</property>
        </output>
    </filter>

	<filter>
        <name>Left Ground Effect for Pontoons</name>
        <type>gain</type>
        <enable>
            <condition>
                <not>
                    <property>/sim/freeze/replay-state</property>
                </not>
            </condition>
        </enable>
        <input>
            <property>/fdm/jsbsim/hydro/left-ground-effect-speed-kt</property>
        </input>
        <output>
            <property>/fdm/jsbsim/hydro/left-ground-effect-speed-kt-actual</property>
        </output>
    </filter>

	<filter>
        <name>Right Ground Effect for Pontoons</name>
        <type>gain</type>
        <enable>
            <condition>
                <not>
                    <property>/sim/freeze/replay-state</property>
                </not>
            </condition>
        </enable>
        <input>
            <property>/fdm/jsbsim/hydro/right-ground-effect-speed-kt</property>
        </input>
        <output>
            <property>/fdm/jsbsim/hydro/right-ground-effect-speed-kt-actual</property>
        </output>
    </filter>

	<filter>
        <name>Tail Ground Effect</name>
        <type>gain</type>
        <enable>
            <condition>
                <not>
                    <property>/sim/freeze/replay-state</property>
                </not>
            </condition>
        </enable>
        <input>
            <property>/fdm/jsbsim/ground/tail-ground-effect-speed-kt</property>
        </input>
        <output>
            <property>/fdm/jsbsim/ground/tail-ground-effect-speed-kt-actual</property>
        </output>
    </filter>

	<filter>
        <name>Left Wing Ground Effect</name>
        <type>gain</type>
        <enable>
            <condition>
                <not>
                    <property>/sim/freeze/replay-state</property>
                </not>
            </condition>
        </enable>
        <input>
            <property>/fdm/jsbsim/ground/left-wing-ground-effect-speed-kt</property>
        </input>
        <output>
            <property>/fdm/jsbsim/ground/left-wing-ground-effect-speed-kt-actual</property>
        </output>
    </filter>

	<filter>
        <name>Right Wing Ground Effect</name>
        <type>gain</type>
        <enable>
            <condition>
                <not>
                    <property>/sim/freeze/replay-state</property>
                </not>
            </condition>
        </enable>
        <input>
            <property>/fdm/jsbsim/ground/right-wing-ground-effect-speed-kt</property>
        </input>
        <output>
            <property>/fdm/jsbsim/ground/right-wing-ground-effect-speed-kt-actual</property>
        </output>
    </filter>

	<filter>
        <name>Nose Gear Ground Effect</name>
        <type>gain</type>
        <enable>
            <condition>
                <not>
                    <property>/sim/freeze/replay-state</property>
                </not>
            </condition>
        </enable>
        <input>
            <property>/fdm/jsbsim/ground/nose-gear-ground-effect-speed-kt</property>
        </input>
        <output>
            <property>/fdm/jsbsim/ground/nose-gear-ground-effect-speed-kt-actual</property>
        </output>
    </filter>

	<filter>
        <name>Left Gear Ground Effect</name>
        <type>gain</type>
        <enable>
            <condition>
                <not>
                    <property>/sim/freeze/replay-state</property>
                </not>
            </condition>
        </enable>
        <input>
            <property>/fdm/jsbsim/ground/left-gear-ground-effect-speed-kt</property>
        </input>
        <output>
            <property>/fdm/jsbsim/ground/left-gear-ground-effect-speed-kt-actual</property>
        </output>
    </filter>

	<filter>
        <name>Right Gear Ground Effect</name>
        <type>gain</type>
        <enable>
            <condition>
                <not>
                    <property>/sim/freeze/replay-state</property>
                </not>
            </condition>
        </enable>
        <input>
            <property>/fdm/jsbsim/ground/right-gear-ground-effect-speed-kt</property>
        </input>
        <output>
            <property>/fdm/jsbsim/ground/right-gear-ground-effect-speed-kt-actual</property>
        </output>
    </filter>

	<filter>
        <name>Nose Off Road Tyre Smoke Ground Effect</name>
        <type>gain</type>
        <enable>
            <condition>
                <not>
                    <property>/sim/freeze/replay-state</property>
                </not>
            </condition>
        </enable>
        <input>
            <property>/fdm/jsbsim/ground/nose-tyre-smoke-ground-effect-speed-kt</property>
        </input>
        <output>
            <property>/fdm/jsbsim/ground/nose-tyre-smoke-ground-effect-speed-kt-actual</property>
        </output>
    </filter>

	<filter>
        <name>Left Off Road Tyre Smoke Ground Effect</name>
        <type>gain</type>
        <enable>
            <condition>
                <not>
                    <property>/sim/freeze/replay-state</property>
                </not>
            </condition>
        </enable>
        <input>
            <property>/fdm/jsbsim/ground/left-tyre-smoke-ground-effect-speed-kt</property>
        </input>
        <output>
            <property>/fdm/jsbsim/ground/left-tyre-smoke-ground-effect-speed-kt-actual</property>
        </output>
    </filter>

	<filter>
        <name>Right Off Road Tyre Smoke Ground Effect</name>
        <type>gain</type>
        <enable>
            <condition>
                <not>
                    <property>/sim/freeze/replay-state</property>
                </not>
            </condition>
        </enable>
        <input>
            <property>/fdm/jsbsim/ground/right-tyre-smoke-ground-effect-speed-kt</property>
        </input>
        <output>
            <property>/fdm/jsbsim/ground/right-tyre-smoke-ground-effect-speed-kt-actual</property>
        </output>
    </filter>

</PropertyList>