On Sun, 2003-06-08 at 18:32, Norman Vine wrote: > Tony Peden writes: > > On Sun, 2003-06-08 at 17:43, Norman Vine wrote: > > > Tony Peden writes: > > > > > > The implementation of the c172 in JSBSim is such that the elevator > > > > *does* move. It just doesn't feedback into the elevator > > > > command that's displayed on the panel. > > > > > > Exactly ! > > > > > > OK - This is what I am trying to feret out > > > > > > How should this feedback be modeled ?? > > > > > > Or asked another way given the lack of feedback should the AP be > > > operating on the Elevator Control directly rather then the elevator trim > > > And the trim left as a mechanism that allows setting the offset from the > > > 'neutral' position of the Elevator with respect to the standard > > positioning > > > > In the case of JSBSim, just look at elevator-pos rather than what's fed > > into elevator-cmd. > > Sounds simple and AFAIK we are already reading the elevator-pos from > all of the FDMs for instrument positioning but ...
I think FG reads the elevator command before it even goes to the FDM. It is *definitely* not reading the actual surface position from JSBSim. > > The problem is that it is the elevator_trim that is being adjusted by the > autopilot ... > > > There may be some details to work out, but once that's done the trim > > indicator should show the neutral (or hands-off) position of the > > elevator. > > So my guess is that my 'turnbuckle' analogy below is what is wanted > but this is a rather major, albeit relatively simple to implement, change > in the logic and am trying to make sure that this is what is wanted. My suggestion will, I believe, give the desired result. > > > Also, this would be model specific so that the indicators would once > > again be independent if the trim doesn't drive the elevator. > > :-)) > > > > i.e. if this were a mechanical linkage the 'trim' would be a > > > turnbuckle that could adjust the lenght of a piece of the linkage. > > Cheers > > Norman > > > _______________________________________________ > Flightgear-devel mailing list > [EMAIL PROTECTED] > http://mail.flightgear.org/mailman/listinfo/flightgear-devel -- Tony Peden <[EMAIL PROTECTED]> _______________________________________________ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
