I'd tend to pay some attention to McFarland's document, but haven't had a chance to review it with this in mind. Might get to that today.
> -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED]]On Behalf Of Tony Peden > Sent: Wednesday, October 16, 2002 8:28 AM > To: FGFS Devel > Subject: Re: [Flightgear-devel] TC ball > > > On Tue, 2002-10-15 at 20:12, Curtis L. Olson wrote: > > FWIW, the turn coordinator ball behaves *very* differently between > > JSBSim and YASim and another FDM I am playing with. All supposedly > > return accelerations in body axis in ft/sec squared. > > IMO, what we should all be aiming at providing are accels very similar > to what three body-axis aligned acclerometers mounted at the pilot > eyepoint would give. The FDMs should provide to the TC only that which > an airplane would provide, the raw forces or accels. > > > > > This means we > > can't create a single turn coordinator instrument who's ball behaves > > reasonably well for every FDM. > > Well, I tried to compare the two, but got this for the yasim c172: > > > YASim solution results: > Iterations: 404 > Drag Coefficient: 18.9992 > Lift Ratio: 87.1639 > Cruise AoA: -0.124142 > Tail Incidence: 0.440443 > Approach Elevator: -1.00013 > CG: -2.3, -0.0, 0.2 > YASim SOLUTION FAILURE: > Insufficient elevator to trim for approach > [exit] > > I just used fgfs --aircraft=c172-yasim, is anything else needed? > > > Would it be better to force the FDM's to calculate a ball deflection > > in degrees/radians, or do we need to investigate why the body axis > > accelerations are so radically different for 3 different FDM's (who > > all are trying to model a C172.) > > No and yes. > > If the FDM's do the work, then they > > all have to do the failure modeling too. It would be nicer to figure > > out what's going on ... it seems to be more than a simple coordinate > > system difference, unless JSBSim/YASim swap X/Y axes or something > > strange like that. > > > > > > Regards, > > > > Curt. > > -- > > Curtis Olson IVLab / HumanFIRST Program FlightGear Project > > Twin Cities [EMAIL PROTECTED] [EMAIL PROTECTED] > > Minnesota http://www.menet.umn.edu/~curt http://www.flightgear.org > > _______________________________________________ > Flightgear-devel mailing list > [EMAIL PROTECTED] > http://mail.flightgear.org/mailman/listinfo/flightgear-devel -- Tony Peden [EMAIL PROTECTED] We all know Linux is great ... it does infinite loops in 5 seconds. -- attributed to Linus Torvalds _______________________________________________ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
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