Hi John,

I ran into the same problem with using generic instruments when 
developing the bluebird over 2 years ago. Some instruments rely on 
properties that are only updated by the FDM, and the ufo doesn't.
So I wrote my own nasal to fill in those gaps, and/or I made my own 
instruments by modifying a line or two from the generic version.

In another case, the instrument(s) look to the property
systems/electrical/outputs
and so does not work because the ufo does not have an electrical bus. :)

Another property the ufo fdm does not update is
altitude-agl

etc. etc. So you can't change the FDM and expect everything that rely on 
a specific FDM, to keep working.

Stewart



John Denker wrote:
> Here's a mystery for you: Please take a look at
>   http://www.av8n.com/fly/fgfs/img48/null-fdm-instruments.png
>
> Most of the instruments are working, but the rate-of-turn 
> indicator and the Nav 1 CDI/GS needles are frozen.  You 
> can see from the property browser that the Nav receiver is
> properly tuned up and is trying to drive the needles.
>
> This is observed during playback using the null FDM.  The
> same sort of frozen instruments are observed using the UFO
> FDM.
>
>
> I have debugged this as far as I can.  I'm stuck.  I don't
> have any good hypotheses as to why some instruments are
> working while some parts of other instruments are not 
> working.
>   


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