UA744Flagship
Topic Author
Posts: 1433
Joined: Tue Jul 13, 1999 1:55 pm

777 "Thrust Flaperon Scoopula"

Sun Jul 21, 2002 4:28 pm

Sorry for the title, that is the only phrase I can think of to describe the 777s little outboard segment that helps control the direction and power of the gigantic engine thrust... know what I'm talking about?

It's the thing that is always moving this way and that particularly when the 777 is on final approach.
no wire hangers!
 
UA744Flagship
Topic Author
Posts: 1433
Joined: Tue Jul 13, 1999 1:55 pm

RE: 777 "Thrust Flaperon Scoopula"

Sun Jul 21, 2002 4:44 pm

Whoops! Forgot my question.

Regarding this critical and (seeming to me) advanced wing piece... what is its official name and funciton?
no wire hangers!
 
Mr.BA
Posts: 3310
Joined: Sun Sep 24, 2000 12:26 pm

RE: 777 "Thrust Flaperon Scoopula"

Sun Jul 21, 2002 5:54 pm

I can't think of anything more than the Ailerons. Are you refering to that?
Boeing747 万岁!
 
victech
Posts: 541
Joined: Sun Jun 11, 2000 9:46 am

RE: 777 "Thrust Flaperon Scoopula"

Sun Jul 21, 2002 10:30 pm

Sometimes a pictures is worth 1K words...can you point it out in either of these pics?


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Photo © PolishAir42 - Chicago Aviation Photography
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Photo © Wietse de Graaf

 
cdfmxtech
Posts: 1319
Joined: Wed Jul 05, 2000 11:37 am

RE: 777 "Thrust Flaperon Scoopula"

Sun Jul 21, 2002 11:52 pm

Thats an inboard aileron - or flaperon. Has no function as far as directing thrust. It is for roll control.
 
UA744Flagship
Topic Author
Posts: 1433
Joined: Tue Jul 13, 1999 1:55 pm

RE: 777 "Thrust Flaperon Scoopula"

Mon Jul 22, 2002 12:34 am

I see... so it's just a flaperon.

The 767 and 747 also have one (if you look at the trailing edge, it's the small squarish flap/aileron "flaperon" looking thing in between the inboard flaps and outboard flaps).

However, I've noticed the 767/747 flaperon doesn't move or adjust nearly as much.

The reason why I thought it had something to do with controlling thrust was that this inboard aileron - or flaperon moves into a full down position when the thrust reversers go on. It also moves very dramatically on final approach.
no wire hangers!
 
cdfmxtech
Posts: 1319
Joined: Wed Jul 05, 2000 11:37 am

RE: 777 "Thrust Flaperon Scoopula"

Mon Jul 22, 2002 1:01 am

The B777 flight control PCUs, especially the ailerons (both inbd & outbd) have like 3 different modes that they operate in. Depending on the flight phase, the PCUs act differently. For instance on TO roll deflect full down, and then an a certain speed return to the faired position.
The deflection u see during approach is normal roll control.
The deflection u see during to roll are a function of the different logics depedngin on airpspeed and eng thrust. The deflection u see during landing roll is a function of airspeed. It has nothing to do w/thrust reversers.

Rather than write about it twice...go here:
http://airliners.net/discussions/tech_ops/read.main/26899/
 
wilax
Posts: 448
Joined: Tue Jun 18, 2002 2:39 pm

RE: 777 "Thrust Flaperon Scoopula"

Mon Jul 22, 2002 5:01 am

The reason that it seems to move more on finals is because at a sower speed, it has to deflect farther to have any effect at all. Often on final approach, there are alot of corrections to be made due to winds and turbulence to line up perfectly on the glidescope and/or the runway centerline.
 
Soku39
Posts: 1731
Joined: Fri Nov 03, 2000 7:16 am

RE: 777 "Thrust Flaperon Scoopula"

Mon Jul 22, 2002 11:35 am

Look through some of the Kai Tak pics to see the things fully extended if you still want to know what they look like.
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