PPRuNe Forums - View Single Post - Response of FBW aircraft in updraft
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Old 2nd Jan 2015, 21:32
  #33 (permalink)  
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Join Date: Jun 2009
Location: florida
Age: 81
Posts: 1,611
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autopilot mode on "updraft/downdraft"

Just asking, and the FCOM is no good. Gotta talk with folks that have been there and have the tee shirt.

Seems to me that the pitch correction to the basic one gee command could make for a rougher ride than a simple gee command ( not attitude command, and no correction for pitch attitude). So a severe updraft has the plane trying to reduce the gee and vice versa for a downdraft.

The "pure" gee command ( yeah, some rate and gains, but that's all) I flew with 35 years ago had the effect of dampening out the turbulence at altitude and same for the thermals we had flying real low over the desert. The tiny jet felt like it was much bigger and heavier. I had a joy ride in a 'vark one day, and that's a good comparison.

I would bet that the 'bus smooths out turbulence faster and better than we humans. Gotta get some feedback from real 'bus drivers.

PJ2???? You on here?
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