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777 "Thrust Flaperon Scoopula"  
User currently offlineUA744Flagship From , joined Dec 1969, posts, RR:
Posted (12 years 4 months 1 week 6 days 3 hours ago) and read 1966 times:

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.

8 replies: All unread, jump to last
 
User currently offlineUA744Flagship From , joined Dec 1969, posts, RR:
Reply 1, posted (12 years 4 months 1 week 6 days 2 hours ago) and read 1949 times:

Whoops! Forgot my question.

Regarding this critical and (seeming to me) advanced wing piece... what is its official name and funciton?


User currently offlineMr.BA From Singapore, joined Sep 2000, 3423 posts, RR: 22
Reply 2, posted (12 years 4 months 1 week 6 days 1 hour ago) and read 1938 times:

I can't think of anything more than the Ailerons. Are you refering to that?


Boeing747 万岁!
User currently offlineVictech From United States of America, joined Jun 2000, 546 posts, RR: 2
Reply 3, posted (12 years 4 months 1 week 5 days 21 hours ago) and read 1904 times:

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



User currently offlineCdfmxtech From United States of America, joined Jul 2000, 1341 posts, RR: 26
Reply 4, posted (12 years 4 months 1 week 5 days 19 hours ago) and read 1886 times:

Thats an inboard aileron - or flaperon. Has no function as far as directing thrust. It is for roll control.

User currently offlineUA744Flagship From , joined Dec 1969, posts, RR:
Reply 5, posted (12 years 4 months 1 week 5 days 19 hours ago) and read 1883 times:

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.


User currently offlineCdfmxtech From United States of America, joined Jul 2000, 1341 posts, RR: 26
Reply 6, posted (12 years 4 months 1 week 5 days 18 hours ago) and read 1889 times:

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/


User currently offlineWilax From United States of America, joined Jun 2002, 465 posts, RR: 3
Reply 7, posted (12 years 4 months 1 week 5 days 14 hours ago) and read 1832 times:

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.

User currently offlineSoku39 From United States of America, joined Nov 2000, 1797 posts, RR: 9
Reply 8, posted (12 years 4 months 1 week 5 days 8 hours ago) and read 1809 times:

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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