dany93 wrote:nickyivyca wrote:....to retune the glideslope, which seems to be unsteady with the new elevator authority. The main problem is transition now instead of the main action-it will go all the way up, then all the way down when it first is enabled. I have to fix that obviously.
(I don't remember that we have changed elevator authority, which seems correct)
I observed this, and, if we speak about the same issue, I think that's neither due to elevator authority nor autopilot.
(I make these tests at KSFO, runway 28R, approach leveled flight 2000, 3000 or 4000 ft. GS beam is catched just before San Mateo Bridge.)
For the autopilot, gs-rate-of climb is the target (reference) given by NAV1 Glideslope for vertical-speed-fps.
If we activate NAV1 glideslope before the GS beam is catched, gs-rate-of climb (Int. Properties/Instrumentation/nav/) is static (steady) and I've seen it at any value (can be 96, or -64).This drives the autopilot to climb or steeply dive. When the GS beam is catched, the gs-rate-of climb can go to 200 then -181, before stabilizing around -20 fps. The autopilot tries to make the vertical speed to follow, but it works well: the problem is gs-rate-of climb, NAV1 glideslope must not be activated before the GS beam is catched.
Are your observations due to this?
Dany
redneck wrote: but I'd have to take a look again since the scale is nonlinear
nickyivyca wrote:In my tests, on the 3 degree glideslope at KSFO it needed 55% power for an approximately 15% fuel approach (pax/cargo standard).
At 250 KIAS and fuel with wing tanks full, the autopilot seemed pretty stable
dany93 wrote:But it's rough at 450 kts (Flaps 0, Gear up), up to red / black view at transitions.
dany93 wrote:In manual control and climbing at 450kts, the aircraft seems to like going on climbing, it resists when pushing the yoke to go down. If we insist, it is rough, with the red view.
dany93 wrote:I couldn't obtain solver results like yours. It gives an error message:
C:\Program Files\FlightGear\bin\Win32>yasim.exe C:\Program Files\FlightGear\data\Aircraft\787\787.xml
XML parse error: Failed to open file
at C:\Program (SimGear XML Parser)
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