4 Jun 2003 05:44
RE: Parasite drag as a function of aoa
Jon Berndt <jsb <at> hal-pc.org>
2003-06-04 03:44:29 GMT
2003-06-04 03:44:29 GMT
Hi All:I'm new to FlightGear. I had a general simulation question that I was curious about.Does jsbsim handle parasite drag changing as a function of aoa? If so, how do you go estimating how to model that? If examples would help we could use the jsbsim P-51D model you guys have created as a reference.Thanks!David
If the data was available in the
form of aerodynamic coefficients as a function of alpha, then yes, we could. The
P-51D model that JSBSim now uses is an interim model until I finish the more
detailed model. I am using Digital DATCOM to estimate coefficients for
that version of the P-51D aero model. In the simplest case, now, one
provides a minimum drag coefficient and the induced drag can be
calculated. We can also estimate drag
contributions due to flaps, gear, etc. We would of course have a much
better model if we estimated parasite drag effects due to alpha and beta.
Like I said, though, there's no reason this could not be done, as JSBSim allows
any number of aero coefficients to be
specified.
I hope that helps a little bit at
least.
Jon
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