WingFlaps wrote in news:d67eeb73-982b-4030-a9bc-
:

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?


Of course it's affected, but that doesn't mean that the area changes, it
does not. The flow is affected and the forces are affected but the area
doesn't change. You can look at it that way if you like, but it will
mean that you won't grow to have a deeper understanding of the way the
surfaces work. IOW, you'll be like Ken.


Bertie