Re: Parameter Estimation

> > I'm not completely clear on it, but I've been told that X-Plane can
> > calculate some of the derivatives for you.  It calculates those
> > depending on shape and design of your aircraft.  How it does it is by
> > magic.
> 
> Pffft!  Hype. :-\
> 
> If you want stability derivatives, you can also go to the NASA Dryden Flight Research
> Center tech report server as well as the NASA Langley tech report server and search on
> "Stability Control" or "dynamics" or "derivatives" and you will find loads of reports with
> that info. If you want specific aircraft aero coefficients, etc. you will have to spend
> some time getting those. There is a real art to that. If you know performance data and
> aircraft geometry and you want a model up and running quickly you could try YASim.
> 
> IIRC, there's an article in one of the JSBSim newsletters about authoring an aerodynamic
> model for JSBSim. You could try looking here:
> 
> www.jsbsim.org
> 
> Also look at the references page.
> 
> Jon
> 

lol!  I just meant to be a little sarcastic about how X-Plane works...
the fact that not everything  it does is crystal clear, thats all.  I
remember a story about someone who used X-Plane to simulate a re-entry
vehicle, which when it hit the surface bounced and went back out to
space.  All these little bells and whistles which are real cool, it
was modeling elasticity I think... but the simple truth is the vehicle
should have been destroyed.  I wonder why that didn't happen.

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