Maybe this was already posted and I missed it.

 http://www.youtube.com/watch?v=npniZ6iwo30

 Looking at the B787, It is very noticeable the flex of the wings and
 changes of dihedral. Would this be less apparent in level flight?

 What would be the effects of this changes for pitch and/or roll if
 this happens while landing (low & slow).

 Your thoughts will be appreciated.

 Alfonso

 They all flex. If you look out the window in a 747 during turbulence it
will
 scare the hell out of you :)

 Apparently this is not noticed by the pilot but I am no airline pilot by
a
 long shot :)

 Flex up and down is OK but twist that increases the angle of attack at
the
 tip is a no no for flutter reasons.

 Paul Lamar


All airplane structures flex.  Some just do it more than others..  On
the light side, sailplanes flex a lot..  Paul mentioned 747..  How
about the B52 or the C5.

My recollection is that there's a big airplane out there that has
active flex damping in the control system.  Keeps the pilot from
(inadvertently) making control inputs which increase the "flapping".
Maybe the A380?

Matt-

A lot of airplanes designers  are implementing that as it eases the
structural requirements and hence lowers the weight. It also helps in
turbulence so you can fly faster. Maneuver speed you know.

Paul Lamar


Paul,
C5's use "Stability Augmentation" but for a different reason. They use it
with accelerometers to stabilize the fusalage during air drops. Actually
loads the wings harder as the computer is reacting to dirty air and using
flight controls to keep the fuse stable at the expense of wing flex.
And to think they dreamed that up in the late 60's or early 70's. Your phone
has more computer in it than the early central air data computers.
Larry