Howto:Implement pushback: Difference between revisions

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Howto:Implement pushback (view source)

Revision as of 12:48, 23 April 2009

569 bytes removed ,  23 April 2009
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Currently, pushback is only used on [[JSBSim]] planes.
Currently, pushback is only used on [[JSBSim]] planes.


Within a short period, some generic pushback models will be available in the <tt>$FG_ROOT/Models</tt> directory. These models can be used at any plane, in a process that is described below.
'''Within a short period, some generic pushback models will be available in the <tt>$FG_ROOT/Models</tt> directory. These models can be used at any plane, in a process that is described below.'''


===Systems/pushback.xml===
===Systems/pushback.xml===
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     <default value="0"/>
     <default value="0"/>
     <test  logic="AND" value="1">
     <test  logic="AND" value="1">
       /sim/model/pushback/linked == 1
       /sim/model/pushback/position-norm == 1
      fcs/cutoff-switch == 0
       /gear/gear/wow == 1
       /gear/gear[0]/compression-norm gt 0.15
     </test>
     </test>
   </switch>
   </switch>
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   <system file="pushback"/>
   <system file="pushback"/>
And at the end of the FDM, the following is needed to attach the forces of the pushback to the aircraft:
<external_reactions>
  <force name="pushback" frame="BODY">
  <location unit="IN">
    <x>  -139 </x>
    <y>    0.0 </y>
    <z>  -71.0 </z>
  </location>
  <direction>
    <x>1</x>
    <y>0</y>
    <z>0</z>
  </direction>
  </force>
</external_reactions>


===-set.xml===
===-set.xml===
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   <magnitude>0</magnitude>
   <magnitude>0</magnitude>
   <linked>0</linked>
   <linked>0</linked>
  <position-norm>0</position-norm>
   </pushback>
   </pushback>
  </model>
  </model>
Below the </sim> tag we add our keyboard bindings:
<keyboard>
  <key n="43">
  <name>+</name>
  <desc>Pushback Magnitude increase</desc>
  <repeatable type="bool">true</repeatable>
  <binding>
    <command>property-adjust</command>
    <property>/sim/model/pushback/magnitude</property>
    <max type="double">40000</max>
    <step type="double">20000</step>
  </binding>
  </key>
  <key n="45">
  <name>-</name>
  <desc>Pushback Magnitude decrease</desc>
  <repeatable type="bool">true</repeatable>
  <binding>
    <command>property-adjust</command>
    <property>/sim/model/pushback/magnitude</property>
    <min type="double">-40000</min>
    <step type="double">-20000</step>
  </binding>
  </key>
  <key n="109">
  <name>m</name>
  <desc>Pushback Linked</desc>
  <binding>
    <command>property-toggle</command>
    <property>/sim/model/pushback/linked</property>
  </binding>
  <binding>
    <command>property-assign</command>
    <property>/sim/model/pushback/magnitude</property>
    <value type="double">0</value>
  </binding>
  </key>
</keyboard>


===Models/ .xml===
===Models/ .xml===
In your planes model file, we add a reference to one of the generic pushback models, or a custom made, shipped with your plane.
In your planes model file, we add a reference to one of the generic pushback models, or a custom made truck, shipped with your plane. Edit the offsets to fit your plane. The nosegear of the aircraft should be between the rear gear of the pushback, when it is connected.


  <model>
  <model>
Retrieved from "https://wiki.flightgear.org/Special:MobileDiff/12300"

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