running own aircraft

[tmy1986]

Hi all.
I am trying to create a jet and air balloon model to run in flightgear.
So far I have done both ac3d models and put that in the different Aircraft/Models file.
And the aircraft.xml and engine.xml had already created by jsbsim.
I create a set.xml but it is not working when I run it in flightgear.
Since "Could not open thruster file:direct.xml"

Can someone please give me some ideas how to modify this issue?
Is there a easy way to modifty the set.xml file?

[tmy1986]

Here is my balloon set.xml file
<?xml version="1.0"?>

<PropertyList>
<sim>

<description>balloon</description>

<flight-model>jsb</flight-model>
<aero>balloon</aero>

<model>
<path>Aircraft/balloon/Models/balloon.ac</path>
</model>

</sim>
</PropertyList>

[Hooray]

hi & welcome!

Is there a easy way to modifty the set.xml file?

XML files are just plain text files, they can be opened and edited in any text editor - you'll probably want to use a dedicated XML editor, though.
The aircraft-set.xml file is a conventional PropertyList/XML file: http://wiki.flightgear.org/PropertyList_XML_File

Otherwise, it's trivial to change/augment these files, see the following links for details: http://wiki.flightgear.org/Aircraft-set.xml


There's also a dedicated aircraft developer portal at: http://wiki.flightgear.org/Portal:Developer/Aircraft

[tmy1986]

I had read though the wiki and still not figured that out my mistake (I am really not good at programming):(
Is there a minimum way to run that jsb model?
Or please correct my mistake on the code:(

[Gijs]

Hi,

A turbine engine needs a "direct" thruster, in the form of a Engines/direct.xml file, instead of a propeller. Take a look at any JSBSim airliner (eg 747-400) for an example.

This is explained at http://wiki.flightgear.org/JSBSim_Thrusters#FGDirect (scroll up to see a table of matching engines and thrusters).

Cheers,
Gijs

[tmy1986]

Thanks for help. It can run in simulation now.
But what should I do next to make it fly?

[Hooray]

please see the links I posted, and spend some time reading the various docs.

[tmy1986]

Can you please give me some hints on it?:(
As I read through the links you posted and I want to try a simple way to fly an own aircraft but it is still too hard for a beginner I reckon.
I did add a autopilot system in set.xml but it is still not flying when I pressed S or 9. Can you please tell me which section it control the aircraft flying?

[hvengel]

Probably the easiest way to get this going is to find another JSBSim aircraft that is similar to yours and look at how it is setup. Even easier would be to copy that models configuration and then start making modifications to suit your aircraft. JSBSim can be complex depending on how advanced your aircraft is but using the copy and modify approach will allow you to get started and give you a platform to learn new stuff as you make modifications to the configuration.