> From: Martin Spott [mailto:martin.sp...@mgras.net] > > This one shows the nose wheel _velocity_ over a timespan, the other > three diagrams are showing the slip _angle_. To draw a reasonable > conclusion it would be interesting to see the same measurand, say the > slip velocity for all of the involved cases and not only for the nose > wheel but for for the main gear as well.
Oh, blast it. I printed the wrong chart. Well, it was very late ... :-( > BUT, basically, I'd say this is not the point at all - these are > interesting theoretical approaches to the problem, but for the 'real' > user who's getting veered off the apron while he is simply doing a > proper run-up at a windy location, this is entirely irrelevant. If this is truly the case, and if it is due to a gear modeling fidelity issue, then I agree. But, the kind of problem you describe would be a different issue. Since wind effects are only ramped in as velocity increases, the example you describe above should not happen with JSBSim. > I'll tell you that quite a bunch of users is unsatisfied but many of > them take the current situation as given because they didn't know that > a proper solution had been available. It's vitally important that we see such problem reports. I've helped people tune their gear models successfully. If I don't see the error reports, I can't help. There is a bug reporting page at the JSBSim web site that should be used for this: http://sourceforge.net/tracker/?atid=119399&group_id=19399&func=browse You may have to try loading this page twice, since it seems SourceForge is having problems with its web site, periodically. > Just for the sake of completeness: Think of a scenario on the carrier, > you're approaching the catapult from behind .... oh, too far, you're > idling the engine, letting the wind blow you backwards while you're > slowly manoeuvering your aircraft right into the catapult position > solely by nose wheel steering. That's what I call proper simulation of > tire ground reactions. FlightGear _could_ do that - it they didn't > depend decisions made at JSBSim. > > Cheers, > Martin. JSBSim also does not (quite yet) do blade element modeling, so it's not easy to do a proper snap roll. Nor do we model multiple articulated landing gear struts. Nor do we ... As with any FDM, there are caveats and limitations. Your last paragraph is a good example of something I hadn't considered - that one would actually want to use the wind to do something while at almost zero velocity on the ground. I can look into that. Apart from that, do you have a specific proposal in mind? We should move this to a new thread. Jon ------------------------------------------------------------------------------ Create and Deploy Rich Internet Apps outside the browser with Adobe(R)AIR(TM) software. With Adobe AIR, Ajax developers can use existing skills and code to build responsive, highly engaging applications that combine the power of local resources and data with the reach of the web. Download the Adobe AIR SDK and Ajax docs to start building applications today-http://p.sf.net/sfu/adobe-com _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
