To make that work on the 747, I had to pretty much can the fuel/engine model in JSBSim and modify the control packet sending data to FG.  Basically, it works as follows:

Based on cockpit switches ( throttle, x-feed valves, boost pumps, cutoff switches) the sim calculates which tank is connected to which engine and if the line is open.  It then sends the result to FG and onto JSBSim to instruct the engine model to draw the correct amount of fuel, based on rate and dt, from the correct tank.  result is any tank can feed any engine  and any engine can draw from any tank which is how the real airplane works.  The code for JSBSim is in the tar file from MIADC or Scale.  It is not part of the CVS tree or 0.9.9, source is avaialble but not my call to put it in.

JW

Justin Smithies wrote:
For starters turning off the fuel pump , the engine should start to become 
starved of fuel and stop
I also noticed that none of the electrical systems can be switched off either.
I am trying to add as much realism i.e. switches etc to this as possible.

Justin Smithies


On Friday 03 March 2006 17:54, Berndt, Jon S wrote:
  
I noticed when running the 737-300 model if i switch off the
fuel pumps this has no effect on the engines at all.
How can i make the pumps turning off have an effect on the
engines etc.
Also i'd like to implement the crossfeeds so i can have the
switches in my cockpit too.
Anyone any ideas or working examples ?

Regards,
Justin Smithies
      
What should the effect of turning off the fuel pump be?

Jon


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