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737 Captain >> 737 Captain - General >> Pitch control
https://www.captainsim.org/forum/csf.pl?num=1353727925

Message started by asanal on Nov 24th, 2012 at 3:32am

Title: Re: Pitch control
Post by Dutch on Nov 25th, 2012 at 4:19am
Unfortunately, for me at least, it does work that way it just doesn't work very reliably.  I'd say 80 percent of the time it works as advertised.  Ten percent of the time it's difficult to get the nose to move at all, and 10 percent it's near impossible.

I start with gentle pressure and often that works.  But sometimes, I can hear the trim wheel clicking and feel it fighting against me.

Let's use a descent as the example.  I'm cleared to a lower altitude.  I cut back on the throttle, switch off the alt hold, and apply gentle downward pressure on the stick.  Often, it will nose down correctly and the autopilot will hold the descent rate I stop at -- more or less accurately but it's acceptable.  But sometimes I press forward and nothing happens.  The nose stays level and I feel and hear the trim wheel working overtime to counteract my pressure.  More forceful pressure will result in some downward motion but when I release the pressure it trims back to level rapidly sometimes overshooting upwards .   Heavy force will cause it to bob violently but it will not descend.  It's determined to not do it, like a stubborn child.

Sometimes I can pull up a bit and it will "release" the hold and then I can press down and it will behave normally.  But sometimes that won't work either.  Nor will operating the trim -- it will counteract my manual trimming with its own to hold its attitude.  

Also fails, say, when I'm descending and want to level off.  I pull up, nothing happens except clicking and whirring as it fights to hold its AND attitude.  More force will bring it up a bit but it will spring back down further when I let go.  I can fight with it and sometimes it will release and let me set it, sometimes it won't.

Oddly, switching off the right paddle (elevator) has NO EFFECT.  It keeps on trying to control.  The ALT HOLD is off so it's not that -- it doesn't try and hold at altitude, it tries to its attitude.

I have made four hour-long flights today and in three of them I had to switch off the autopilot and hand fly because I couldn't get it to do what I needed it to do in time to not bust altitudes.

It does work most of the time.  But somewhere in the code under some circumstances (which I'm trying to determine by experiment)  it's not sensing my pressure on the stick and so not releasing its determination to hold its nose attitude.

Dutch




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