On Tue, Sep 16, 2003 at 10:02:56PM -0400, David Megginson wrote:
> Manuel Bessler writes:
> 
>  > Sure, if a model flies 'by the numbers' is a good start, but there
>  > are other properties that need to be simulated well for a good
>  > model, esp.  outside of cruise (cruise is probably the simplest
>  > part).
> 
> It's all numbers, of course: it's just that the numbers for the
> moments, etc., are not as easily available.

Yes, exactly. 

How are these usually derived/calculated/guessed ?

All I've found was a formula for approximation in a pdf document
on MSFS SDK. I'm not even sure if it was an MS official document.

I've reproduced this formula in my 717.xml jsbsim config.

Regards,
Manuel

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