<!--
based on standard FG wingtip contrail example; but modified condition params
     rjh@zaretto.com
 -->
<PropertyList> 
 <particlesystem>
   <name>wingtip-condensation-trail</name>
   <texture>vapour.png</texture>
 
   <emissive type="bool">false</emissive>
   <lighting type="bool">false</lighting>
 
   <condition>
     <and>
       <less-than>
         <property>surface-positions/wing-pos-norm</property>
         <value>0.4</value>
       </less-than>

       <greater-than>
         <property>velocities/airspeed-kt</property>
         <value>120</value>
       </greater-than>
       <greater-than>
         <property>environment/relative-humidity</property>
         <value>50</value>
       </greater-than>
       <or>
         <less-than>
           <property>/position/altitude-ft</property>
           <value>33800</value>
         </less-than>
       </or>
       <less-than>
         <property>environment/temperature-degc</property>
         <value>20</value>
       </less-than>
       <greater-than>
         <property>orientation/alpha-deg</property>
         <value>15</value>
       </greater-than>
     </and>
   </condition>
 
   <attach>world</attach>
 
   <placer>
     <type>point</type> 
   </placer>
 
   <shooter>
     <theta-min-deg>-1.5</theta-min-deg>
     <theta-max-deg>1.5</theta-max-deg>
     <phi-min-deg>-1.5</phi-min-deg>
     <phi-max-deg>1.5</phi-max-deg>
     <speed-mps>
       <value>0</value>
       <spread>0</spread>
     </speed-mps>
     <rotation-speed>
       <x-min-deg-sec>0</x-min-deg-sec>
       <y-min-deg-sec>0</y-min-deg-sec>
       <z-min-deg-sec>0</z-min-deg-sec>
       <x-max-deg-sec>0</x-max-deg-sec>
       <y-max-deg-sec>0</y-max-deg-sec>
       <z-max-deg-sec>0</z-max-deg-sec>
     </rotation-speed>
   </shooter>
 
   <counter>
     <particles-per-sec>
       <value>4200</value>
       <spread>0.001</spread>
     </particles-per-sec>
   </counter>
 
   <align>billboard</align>
 
   <particle>
     <start>
       <color>
         <red><value>   0.7 </value></red>
         <green><value> 0.7 </value></green>
         <blue><value>  0.7 </value></blue>
         <alpha><value> 0.5 </value></alpha>
       </color>
       <size>
         <value>0.1655</value>
       </size>
     </start>
 
     <end>
       <color>
         <red><value>   1.0 </value></red>
         <green><value> 1.0 </value></green>
         <blue><value>  1.0 </value></blue>
         <alpha><value> 0.1 </value></alpha>
       </color>
       <size>
         <value>0.05</value>
       </size>
     </end>
 
     <life-sec>
       <value>1.9</value>
     </life-sec>
 
     <mass-kg>  0.5 </mass-kg>
     <radius-m> 0.2 </radius-m>
   </particle>
 
   <program>
     <fluid>               air  </fluid>
     <gravity type="bool"> true </gravity>
     <wind typ="bool">     true </wind>
   </program>
 
 </particlesystem>
 
 </PropertyList>
