PPRuNe Forums - View Single Post - Pitch trim - poorly understood?
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Old 29th Mar 2016, 20:54
  #13 (permalink)  
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Join Date: Jun 2009
Location: florida
Age: 81
Posts: 1,610
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"feel" and control position

Salute!

Lemme see if I have this straight, Betwixt ( Sciol xxxx), Gotta love those cryptic/cute locations, huh?

So the 737 flcs ( flight control system) tries to provide feedback like the old, really old planes ( not fully hydraulic or hybrid systems, but more like a Moth, Chipmunk, Champ, Camel, Warhawk, etc) did with mechanical connections and you could actually "feel" the aero forces or lack thereof. Is this all the time or with only AP engaged? Does it use actual dynamic pressure and static pressure? Are pitch rates integrated? and so forth.

I have a hard time understanding why we are not using a straightforward procedure that requires one to maintain a notional attitude regardless of control pressures or seat of the pants cues. I like trim. I do not like holding "x" pounds of pressure or deflection more than I have to. I also get a good "feel" for the jet when it is trimmed and I note how far off of "normal" the surfaces are positioned.

Looking fwd to more explanations of trim implementations here.
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