Fergus Kyle
Joined: 03 Jun 2007
Posts: 291
Location: Burlington ON Canada
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 Posted: Tue Apr 13, 2010 11:59 am Post subject: Effect of flaps and ailerons on pitch trim |
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I digress.......
I can see the cogs of a thousand minds cranking ‘round. – and I’m scared to take part.....
First of all, definition: I learned early that the angle between the wing centreline and the stabilizer centreline was called the Rigger’s Angle of Incidence. In aircraft of the day, this was fixed by the designer. Thus, the trim tab had its effect to reposition the elevator and thus change the shape of the horizontal tail. This in turn revised the up- or down-tendency of the horizontal tail section. What happened to the R’sA of I,? Nothing..
Now, put in the F86 ‘flying tail’ which we have – and its confusions, and I doubt we are all talking about the same thing.
Modern machines divine the proper trim position every second and little motors are forever humming away to keep the aircraft in permanent but adjustable trim - thus simplifying. the task for monkeys. Push on the stick and the whole argument goes out the door. I leave it to others.
One question on a qualification exam (to get promoted) said:
“You are flying the Chief of the Air Staff who is in the back seat of your Harvard (T-6, SNJ). He does not answer you. You look around and the seat is empty. What is the first thing you do?”
The ‘official’ answer was “trim for change in C of G”. I lost, like the majority, most of whom were making MayDay calls. But the correct reply was “I did that instantly when he left because my machine was always in trim”. I appealed, won my case and graduated to Flying Officer. They never did find the CAS.
Cheers, Ferg [quote][b]
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