Aircraft: 757-200 Captain Pro Pack (FS9) v2.2

Is it just me? This aircraft becomes unstable on wide LNAV turns (i.e. 30-degree or more): During the turns, it has trouble maintaing ALT and speed, it descends and climbs at 500FPM+ rates trying to chase the A/P selected ALT and the engines rev up and down to try to maintain speed. I am an experienced FSimmer flying by the book. Any ideas?

Thank you,

Kerke

It's the plane problem. The only cure is to set "Bank angle" switcher from "Auto" to "20" or "25". This makes the plane more stable.

Raven wrote on Jan 8^th, 2010 at 8:01pm:

It's the plane problem. The only cure is to set "Bank angle" switcher from "Auto" to "20" or "25". This makes the plane more stable.

If I change the bank angle on the A/P panel to 20 or 25, will this bank angle be used by LNAV also, or does the panel bank angle settings only apply to "heading select" like in the LDS767?

...Or is it better to change the max bank angle to 20 in the aircraft.cfg [Autopilot] area and keep the panel setting on AUTO?


Kerke

Yep, LNAV will use it, as for aircraft.cfg I didn't change it, so I can say nothing about it. You may try and see what will happen.

Raven wrote on Jan 9^th, 2010 at 12:10am:

Yep, LNAV will use it, as for aircraft.cfg I didn't change it, so I can say nothing about it. You may try and see what will happen.

Didn't work for me, not even with bank angle set at 15 -- the the aircraft captures the ILS, even at just 30 degrees from runway heading, the A/P ingnores the panel A/P bank angle and goes into a steep turn and then the aircraft descends and climbs to try to maintain the selected ALT, engines rev up and down to keep selected speed, far from what I expected from this aircraft and certainly far from the real life 757 aircraft... Dissapointed.

Try one more thing: in "aircraft.cfg" in [custom autopilot] section change "AP_Roll_speed" to 4.70 and "AP_Roll_controlstep" to 3200. Should work.

Raven wrote on Jan 10^th, 2010 at 8:38pm:

Try one more thing: in "aircraft.cfg" in [custom autopilot] section change "AP_Roll_speed" to 4.70 and "AP_Roll_controlstep" to 3200. Should work.

OK, I will try that.

kerke wrote on Jan 12^th, 2010 at 12:26am:

Raven wrote on Jan 10th, 2010 at 8:38pm: Try one more thing: in "aircraft.cfg" in [custom autopilot] section change "AP_Roll_speed" to 4.70 and "AP_Roll_controlstep" to 3200. Should work. OK, I will try that.

I tried it, but it did not make much of a difference. Aircraft back to the hangar. A/P is simply not good.

Thanks anyway,

Kerke