CoolP wrote on Apr 21^st, 2011 at 3:19pm:

I was just doing some circuits around Brisbane (a bigger town on the Isle of Mark  :D) and can confirm quite some S-turn tendency. It gets better when the speeds go down, so VOR approaches as well as some <250kts SIDs and STARs shouldn't be a big problem, but when going fast, the AP really chases the needle. The turn rates are slow, so he is doing corrections for quite some time to establish a Course. I had real world weather on and felt much more confident when using the CDI for verification only, keeping all heading inputs manually (with the bug) or flying the whole thing with the AP off. As my normal enroute Nav comes from the ("sissy"  :P) Civa INS, I usually don't run into trouble with this issue. The Civa turns are smart and right on time, corrections are done fast and with close to no overshooting. If I would go VOR to VOR only, I'd tend to use the manual heading bug and get the wind readings from the Civa, to set up the wind correction course. As said, approaches aren't a problem since the plane is slower and turns better then, so the AP can throw her around way better.  :D I've tried it around 210 knots, some flaps out and 3000ft when being within 15-8nm from the station. Worked fine. Even landed later, a bit hard though, but the crew remained silent until arriving at the gate where they ran away, screaming for help. http://img850.imageshack.us/img850/9162/parkingatbrisbane.th.jpg I remember the 707 to be way better on the VOR to VOR thing, only getting distracted by the cone of silence above the stations, but coming on the right Course pretty fast in between.

Good post, thanks.  I a will take a look at the 707 autopilot section in the aircraft.cfg and compare it to the 727.  Perhaps the autopilot was improved in the 707.  I don't think I have gyro drift enabled, but I will check it out.