engine configuration

Hi,

I am an aeronautical engineering student currently spending a year in 
Sweden. Our project this year is to design and build a demonstrator UAV, 
for search and rescue missions.
I am in charge of implementing it in FlightGear in order to be able to 
assess it's flight characteristics.

I am editing the X-15 files with all our data (from Catia, Datcom and 
Matlab), because having tried to create the xml files from aeromatic, I 
was faced with a version problem and the aircraft wouldn't load.

The  question I wanted to ask concerns the number of engines on the 
aircraft. The X-15 has the XLR99 rocket and the xlr99_nozzle. When I try 
and get rid of the nozzle I get an error msg saying "number engines=1" 
and flightsim aborts.

I am using the engine file of the fokker 100, with the direct file 
associated with it (Tay-651.xml & direct.xml). How should I change the 
propulsion section in X-15.xml to change from the XLR99 rocket to the 
Tay-651 turbine?

Thanks for your help!
Sam

---------------------------------
"It was a love of the air and sky and flying... It lay beyond the 
descriptive words of men." Charles Lindbergh

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