Am 05.03.10 16:54, schrieb Heiko Schulz: > Hello, > > Every airliner uses an Auto PitchTrim controlled by the Autopilot. > So the autopilot controls pitch (altitude) with the elevator, and the trim > mostly (dependant on type) with the stab. > > In FGFS unfortunately none of the airliners uses this autotrim; some of our > airliners even uses the elevator-trim to control pitch, wich is actually > wrong and not very practicable in reality, as a pilot told me today. > > In FGFS only the aircrafts equipped with the Century3 and the KAP140 has Auto > PitchTrim. > > I had a look into, but I coulden't figure it out how does it work, and if it > is possible to implement into other autopilots as well. > > Is this a hardcoded feature, or can be done easily for others AP? > > Can somebody help me on this question? > Hi Heiko,
the auto-pitch-trim channel moves the elevator trim to return the elevator into the neutral position while the pitch-channel moves the elevator to change attitude. Or a bit more technical: The auto-pitch-trim-channel compares the elevator-pos-norm to a reference of zero and adjusts elevator-trim The pitch-channel compares e.g. current pitch with a reference of some calculated target pitch and adjusts elevator-pos Usually the pitch-trim channel is much slower than the elevator channel. HTH, Torsten ------------------------------------------------------------------------------ Download Intel® Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
