Howto:Implement aerial refueling capability

This hotwo teaches you how to implement aerial refueling capability to both tanker and/or receiver aircraft.

Receiver aircraft

Add the following blocks of code to your aircraft's -set.xml file (all after the </sim> tag). Make sure to check for pre-existing blocks/structures and leave them intact. The radar is needed to check if you are close enough from the tanker, the refuel part tell wich type of refueling you are capable of, and if your refuel system is ok to receive (use the serviceable property if you have a switch to open the refuel trap for exemple). The aar.nas check if you're close enough , if you have the same type,and if yes refuel your tanks.

<instrumentation>
 <radar>
  <range type="int" archive="y">20</range>
  <minimized type="bool" archive="y">false</minimized>
 </radar>
</instrumentation>

<systems>
 <refuel>
  <type>probe</type>
  <serviceable type="bool">true</serviceable>
 </refuel>
</systems>

<nasal>
 <aar>
  <file>Aircraft/Generic/aar.nas</file>
 </aar>
</nasal>

The aircraft can receive fuel from the KA6 with the above code. To receive fuel from the KC-135, replace 'probe' with 'boom'.

Tanker aircraft

To allow your plane to be used as a tanker by others players, you only need to add the following blocks of code to your aircraft's model .xml file (usually located in Aircraft/.../Models/):

<multiplay>
 <refuel>
  <type>probe</type>
 </refuel>
</multiplay>

Replace 'probe' with 'boom' in the files for a boom-equipped tanker, This influences what aircraft can receive fuel! Or give the two lines if the tanker get both a boom and probes (like recent kc135) in this case you will be able to refuel both type of aircrafts. You can add the refueling capability to your tanker too, with the lines above for receiver aircrafts. For the moment, flyable tankers are: KC135, victor and KC130 (in c130 folder) if you need an exemple.

Tankers with git version after the 1 september 2010

with the FG 2.0 version and before, the refueling is possible only if the tanker use a "MOBIL" callsign. The current git FG change this, allowing any callsign to be a tanker, and the tanker property is now transmitted by mp, permitting for exemple to prevent refueling if the refueling probe is not operational.

for this to work, add the following code in your aircraft's -set file (be sure not to be in another block):

<tanker type="bool">false</tanker>

and now switch this property true or false to allow following aircrafts to refuel or not.