"Ramapriya" wrote in message
oups.com...
During a cruise, just pressing on one of the rudders should make an
aircraft turn horizontally in that direction, when no ailerons are
used. Reducing power in the opposite engine should logically accelerate
such a turn.

Langewiesche's book "Stick and Rudder" goes into a lot of detail on this.
The basic idea is that what makes a plane turn is a combination of banking
which induces a horizontal lift vector in the direction of the turn and the
rudder inducing a weathervaning effect into the relative wind. It's actually
a rather complicated thing. Butthe easiest way to think about it is, "the
rudder does not make the plane turn." It does, but not the way most people
think. In fact, you'll hear a lot of CFIs here argue that many private
pilots trained these days don't really understand the rudder or use it
properly. Langewiesche himself argued that the rudder was a design artifact
that would be unnecessary on a properly-designed airplane. If this
discussion is at all interesting to you, I recommend buying and reading the
book. It is written for the novice and is still in print.

-cwk.