Why are the inboard and outboard spoilers going a little up there after take-off?

Question

http://www.youtube.com/watch?v=R0bUirGbyI8

Answer 1

Haven't seen the clip but if they are spoilers they work together with ailerons for roll control and are called flight spoilers. Ailerons work together to roll aircraft, one aileron moves up to decrease lift on that wing while the other moves down to increase lift. Increased lift means increased drag and that wing tends to slow down while the other wing has less lift and drag so speeds up. Flight spoilers move up on the down going wing to decrease lift with the aileron but also to increase drag slowing that wing down. Without flight spoilers, especially on swept wing aircraft, banking would introduce a dutch roll motion which is very uncomfortable for the punters.

Answer 2

This is known as high speed ailerons. If the ailerons used full movement the aircraft would bank way to much

Answer 3

You're looking at the flaps - they are extended prior to takeoff/landing, and then retracted.  You might also see the ailerons go up and down a little as the pilot turns the aircraft.

I saw no spoilers deployed.

Answer 4

The others are right.  It's the flaps partially retracting after takeoff.  Personally I am fascinated with the workings of all the wing surfaces going through their paces on airliners.  The 777 is one of the best to watch as well as the old 727.  They used to call it "the airplane who's wings come apart".

If you'd to see a lot more take offs and landings go to this free web site.

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http://www.flightlevel350.com/

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Answer 5

I agree, what you are seeing extended are flaps.  They extend them during to/landing to increase lift.  By increasing the time it takes for air to move across the top surface of the wing, it causes lift.

Answer 6

You did indeed see roll control deflection of the outboard spoilers.  The reason the one in between the two that move stayed still is, that spoiler is not fly-by-wire- it is the cable controlled backup for roll control in case of computer failure, and   has a different deflection pattern.  Spoilers are used for roll at all speeds on the 777.

Answer 7

There were no spoilers deployed in that film clip.  The control surface you see moving frequently right after takeoff is an aileron being used for precise roll control.  Also in this film clip the flaps are retracted.

Answer 8

Roll control - the spoilers on a 777 move asymmetrically (different on each wing) to assist in turning.  It's called spoilerons in most planes, but I think the 777 just calls them asymmetrical spoilers.  That little tab between the flaps also assists with roll.  It's called a flaperon.  In high speed flight, the 777's outboard ailerons are locked out because the spoilers and flaperons provide sufficient roll control.

EDIT:  I see exactly what the asker is saying.  Look at 2:52 through 3:15 of the video.  The spoilers (which ARE used for roll control in the 777) are coming up a bit in conjunction with the flaperon.  They aren't in speedbrake mode, but they are in roll control mode.

Answer 9

Spoiler float?