> > As for myself I would be very nervous using any altitude control system > > that didn't return elevator trim to 'neutral'(1) on disengagment because > > as you say it is a potential killer
Tony wrote: > Whose to say that neutral trim is better? And aside from that, there > really is no such thing as neutral trim for aircraft that trim with > the entire stabilizer. > > Also there is one real practical problem with "resetting" the trim: > trim systems tend to be fairly low rate devices, so returning them to > some "safe" position could actually take some time, say 10-20 seconds. Tony is exactly right. In the F-16, to the best of my recollection, the autopilot and trim commands are summed. This means that when the autopilot is on, if there has been some trim already put in, the autopilot adds to that setting. If the trim is activated during autopiloted flight, the autopilot will correct for that in holding altitude (for instance), so the net effect is zero. If the autopilot is turned off, the trim is NOT returned to any neutral setting - it remains the same. However, there are "sumps" (washouts) in the FCS to temper any transients that might be seen. Jon _______________________________________________ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
