Jon Berndt writes: > There are some nuances to that approach. For example, does it work *with* > the existing approach, or would it be an entirely new and separate way to > define the aero characteristics of an aircraft? If it was to augment the > current way of doing things, would it provide any aero force or moment > that was *already* provided by another set of coefficients? We would not > want to duplicate aero coefficients anywhere.
Treat the current config files as vehicles with a single pseudo-lifting surface, and you should be able to use the same code for both approaches. Gotchas include figuring out mass distribution and the effect of disturbed airflow from the props and wings, especially on the effective alpha and beta of the tail section. > Initially, I think the piecewise approach would be to augment the > full-coefficient approach. For instance, the wing could be broken up into > at least a couple 2 or 3 spanwise segments per side. Each would have its > own portion of the total area assigned to it. Each would have its own > alpha and velocity vector (and perhaps each would bias its own velocity > vector as in the case of a wing with twist towards the tip). This single > case is probably most worthwhile to model in a piecewise method, and the > benefits seem apparent right off the bat. If propeller swirl modeling is > included with this, stall and spin characteristics would be vastly > improved. YASim does this internally, but doesn't require the use to specify things that way -- instead, the user provides the incidence angle and twist (for washout), tapering, etc., and YASim calculates the segments automatically. > However, in the above approach, there would perhaps be a component > of roll damping that would then be modeled by this piecewise > approach. So, would we remove the Clp (roll damping) coefficient? I think that most of the moment coefficients would be redundant when you chose to model an aircraft his way. All the best, David -- David Megginson, [EMAIL PROTECTED], http://www.megginson.com/ _______________________________________________ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
