Flaperons

Maximilian_Jenius

Maximilian_Jenius

Super User
To any "heavy" 767,777 pilots or anyone in the know that wants to answer. What are "flaperons" used for? Also as a pilot when would you select them or not select them for landing or takeoff.

I know that "flaperons" are high speed ailerons used in flight that can double as flaps on takeoff or landing.

In my journeys when flying commercially on 767's I have seen them selected on takeoff or landing or not selcted for both and always wondered why..care to explain?
 
On the Prowler, we used differential spoilers for roll control. Grumman called these "flaperons" although I think a more accurate description would have been "spoilerons." There are a few other aircraft out there that only use spoilers for roll control, like the MU-2 and Beechjet.

In your case (I might be mistaken) I think that maybe this refers to the low speed (outboard) and high speed(inboard) ailerons? The low speed ailerons are active to provide better roll response at low speeds but deactivated at high speeds to reduce bending loads.

Edit: what are you doing up at 0400? hehe
 
Maximillian_Jenius said:
To any "heavy" 767,777 pilots or anyone in the know that wants to answer. What are "flaperons" used for? Also as a pilot when would you select them or not select them for landing or takeoff.

I know that "flaperons" are high speed ailerons used in flight that can double as flaps on takeoff or landing.

In my journeys when flying commercially on 767's I have seen them selected on takeoff or landing or not selcted for both and always wondered why..care to explain?
Click to expand...

Flaperons are a dual purpose control device. They aid in roll control during low and high speed flight and they can move out and down with the extension of flaps.

One thing to remember with regards to ailerons is their limitations during high speed flight. Most large aircraft either lock-out or significantly reduce aileron deflection during high speed flight because the aileron creates twisting moments on the wing which can cause significant torsional deflections of the wing. At very high speeds, the torsional deflection of the wing may be so great that a rolling moment is created opposite to the direction desired ( aileron reversal ).

The Boeing 777 Flight Crew Operating Manual does not give any good information on Flaperons. It just mentions their existance and gives a brief description of their use. Here are the exerts, " Aileron and Flaperon surface deflections are proportional to control wheel displacement.....The Ailerons are locked out at high speed."

The difference you may be seeing on takeoff is probably due to the takeoff flap setting. At Flaps 5, 15, or 20 the Flaperon position will be different. The higher the takeoff flap setting the greater the flaperon displacement.


Typhoonpilot
 
Yeah, Ive been on a 767 a few times and I noticed that the out board ailerons ar not used and the inboard ailerons are used, very slightly though in high speed cruise. Ill ask my dad, hes a wizard about the 767.
 
Maximillian_Jenius said:
To any "heavy" 767,777 pilots or anyone in the know that wants to answer. What are "flaperons" used for? Also as a pilot when would you select them or not select them for landing or takeoff.

I know that "flaperons" are high speed ailerons used in flight that can double as flaps on takeoff or landing.

In my journeys when flying commercially on 767's I have seen them selected on takeoff or landing or not selcted for both and always wondered why..care to explain?
Click to expand...

I can't speak to the 796/757 or 777 models, but I don't think you can actually "select" inboard or outboard ailerons. It is usually a function of airspeed that deselects the outboard aileron, this is to prevent wing twist at high speeds (cruise). The DC8 has two equally sized ailerons in the "normal" position on the wing, below 165 knots both deflect equally, as the speed increases the outboard aileron starts to deflect less than the inboard one. At 230 knots the outboard aileron is completely "locked out".


http://www.flickr.com/photos/colouredinks/36153106/in/set-781303/
is a great picture of the inboard aileron at work while the outboard is locked, on a 767.

As far as seeing them both selected and not selected for takeoff and landing, I'm not sure, unless the crew is using more or less flaps for heavy and light takeoffs and landings.

here is a good pictuer of the 767/757 wing(s) http://www.aerospaceweb.org/question/dynamics/q0137.shtml I don't think the outboard "panel" just outside of the last set of spoiler panels, are part of the flaps or flaperons...
 
With my VERY limited Viper knowledge I want to say that on that plane anyways the whole flap surface moved as an alieron, regardless of what position the flaps are in. However, that is second hand knowledge and one of the guys that actually flies the thing may be able to clear it up.
 
All I know about flaperons is that my uncle is putting them on the ultralight he is building.... knowledge depleted.
 
Flaperons are flaps and ailerons. In the up position the act as plain old ailerons. However, as flaps are slected the ailerons move their "nuetral" position to a deflected position and the ailerons then continue to pivot as normal around this new, lowered position. You find them mainly on STOL aircraft.

The Otter has something that people confuse for flaperons but technically it does not have flaperons. It has outboard flaps to which the ailerons are conected.
 
BobDDuck said:
With my VERY limited Viper knowledge I want to say that on that plane anyways the whole flap surface moved as an alieron, regardless of what position the flaps are in. However, that is second hand knowledge and one of the guys that actually flies the thing may be able to clear it up.
Click to expand...

Your right. The F/A-18 does the samething as there both FBW aircraft. In fact I have seen video of the horizontal stabs on a F-18 acting as ailerons as well.
 
SteveC said:
they're = they are
there = that place


:)
Click to expand...

there = not only that place

For instance, can be used like this.

If there was time to go to the movies...

There isnt a place in that matter
 
Bigey said:
there = not only that place

For instance, can be used like this.

If there was time to go to the movies...

There isnt a place in that matter
Click to expand...


here is another one for you bigey.......

There is supposed to be a apostrophe in isnt. (isn't = is not)
 
JEP said:
here is another one for you bigey.......

There is supposed to be a apostrophe in isnt. (isn't = is not)
Click to expand...
And one for you:

There needs to be an apostrophe when the word following the article starts with a vowel (or an h).
 
Chris_Ford said:
And one for you:

There needs to be an apostrophe when the word following the article starts with a vowel (or an h).
Click to expand...

Actually, the correct indefinite article, a or an, is determined by the sound that begins the word it precedes, not the letter. For example, you might see a UFO (pronounced yoo eff oh), fall down and hurt yourself, and require an MRI (pronounced em ar eye) to diagnose your injury.

The rule you cite about h is also a bit more complicated. But again, it depends on the sound. It would be an honor (h is not sounded) ... Perhaps you should consult a history textbook (h is sounded) ... This will take an hour (h is not sounded) ...



:)


Do we need to change the title of this thread? ;)





.
 
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