On May 6, 10:52*am, wrote:
On May 5, 1:38 pm, WingFlaps wrote:



On May 6, 4:44 am, wrote:

On May 5, 9:51 am, WingFlaps wrote:

On every elevator I've looked at the trim tab is cut out of the
elevator area. It does not ADD area.. When it is deflected it creates
a force that may oppose that produced by the main elevator. In that
way it reduces EFFECTIVE elevator area. (It is not the same as horn)..

Cheers

* * * * *And every airplane that has a trim tab has an elevator that
was designed to be big enough to give all the authority needed even if
the trim tab was deflected all the way in the "wrong" direction.

While I suspect that may be true, you have a reference for that
statemeant? What happens when the elevator runs out of authority and
stalls (as in a badly loaded plane)? Does the elevator lift force and
stall angle reflect trim setting at all?

Cheers

* * * * If the elevator runs out of authority and stalls "in a badly
loaded airplane" then there were factors outside the certification
criteria that caused the accident. Outside the forward CG, for
instance. Same stupidity as overloading the airplane and mushing into
the trees.

* * * *FAR 23.145 deals with elevator authority in the trimmed
condition: (see paragraph 5):http://www.airweb.faa.gov/REGULATORY...RY%5CRGFAR.NSF...

* * * FAR 23.161 deals with trim:http://www.airweb.faa.gov/REGULATORY...RY%5CRGFAR.NSF...

* * * *FAR 23.407 deals with trim tabs deflected in the normal
direction:http://www.airweb.faa.gov/REGULATORY...RY%5CRGFAR.NSF...

* * * *FAR 23.677 deals with runaway trim and the need for adequate
controllability in any trim tab position:http://www.airweb.faa.gov/REGULATORY...RY%5CRGFAR.NSF...


Does the elevator lift force and stall angle reflect trim setting at
all?
Cheers