Curtis L. Olson writes: > David, I'm starting to get nit-picky here :-) but one more thing > ... the elevator doesn't seem to be responding to elevator trim. In a > real life C172 the elevator trim is a little tab on the trailing edge > of the elevator that causes the elevator to actually change position > ... kind of like an elevator elevator.
I haven't added a tab object to the 3-D model yet, but I'd like to understand more about how it actually works first (ditto for elevator and rudder trim). >From the pilot's point of view, I think, the elevator trim tab controls the amount of pressure required to hold an elevator position on the yoke -- you just turn the wheel with your right hand until you don't have to pull or push the yoke with the left hand (or vice-versa in the co-pilot's seat). I don't think that the trim tab changes the range of the elevator movement per se, as much as it changes the lift of the elevator surface in the airstream (i.e. neutral position is different), but I could be totally confused. In JSBSim, we're just summing up the trim and elevator and clamping to the elevator range -- I don't know if that's right, but it doesn't seem to bother most people. We cannot do real trimming without force-feedback controllers (that can hold a non-neutral position). All the best, David -- David Megginson [EMAIL PROTECTED] _______________________________________________ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
