PPRuNe Forums - View Single Post - American Airlines Flight 742 "flight control system" problems
Old 31st Mar 2013, 07:35
  #186 (permalink)  
DozyWannabe
 
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Originally Posted by Capn Bloggs
"Crucially"? You're pulling my leg, surely! Are you seriously saying that this was a consideration in the placement of engines on the wings? Quite apart from the over-sensitive reaction to a tiny bit of asymmetric power, the pitching moment of underwing engines makes them far worse in a control-by-thrust scenario than tailmounts. Desk-jockey nonsense.
Think what you like, but I'm sure it was at least one of the considerations involved. Yes, podded engines mounted under the wing give a pitch-up moment, but there's no denying that as long as that is compensated for, one can get a greater effect on the yaw axis from engines mounted in that manner - it's just basic physics.

Of course, the main reason T-tails with fuselage-mounted engines went out of fashion was the inherent problems with deep stall in that design configuration, but other considerations were undoubtedly involved.
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