Hello,

 

on a Frooglesim engine sound preview video, I noticed a peculiar flaperon behaviour, in that it droops with increased thrust.

 

Is this normal? I can think of two behaviours that might command this (apart from it being a little bug)

 

a) The flaperon droops to deflect the exhaust downwards, therefore helping lift

 

or

 

b) the flaperon is deflected downwards by way of an effect similar to Venturi effect created by exhaus gasses, lowering the air pressure underneath the flaperon, thereby sucking the flaperon (with actuator bypass active) down. I have read a couple of years ago, that flaperon actuators are bypassed in some conditions to lower the actuator wear.

 

 

Is either of those correct?

I believe it's the answer 'b'. If I recall correctly (from a long time ago, mind), the flaperons are in BYPASS mode until 80kts so the increased thrust does indeed 'suck' them down.

I believe it's the answer 'b'. If I recall correctly (from a long time ago, mind), the flaperons are in BYPASS mode until 80kts so the increased thrust does indeed 'suck' them down.

 

Answer B is the winner. It really impressed me first time I noticed it!

"B" is the correct one, and OF COURSE it is simulated on the B777NGX

Wow. The detail in this thing!  I didn't actually realise that was what happened.

 

If you ever fly on a real 777 and sit behind the wing, you will notice really quickly just how much the flaperons move around.

I know you're correct in that the Actuator is disabled certainly on takeoff below approx 80 knots.

 

However what I've seen (from memory) is that the flaperon will initially be down when lined up for Take Off.

 

When the thrust is increased then the actuator will disengage and the Flaperon will 'float' on the exhaust gasses and raise up above the current angle of the extended flaps.

 

Then once passing 80knots the actuator will engage, forcing the flaperon down into the exhaust gasses and to the angle of the extended flaps.

 

I'm sure someone with far more 777 knowledge than me will be along to confirm this in far greater detail than me

 

Cheers,

 

Andy

I dont have Far knowledge of the 777, but i have a youtube video to show it in action 

 

That even that is simulated is crazy!! In a good way :-)

 

Nice video!

You should see the Speedbrakes both in the air and on touchdown (-;

Hello,

 

on a Frooglesim engine sound preview video, I noticed a peculiar flaperon behaviour, in that it droops with increased thrust.

 

Is this normal? I can think of two behaviours that might command this (apart from it being a little bug)

 

a) The flaperon droops to deflect the exhaust downwards, therefore helping lift

 

or

 

b) the flaperon is deflected downwards by way of an effect similar to Venturi effect created by exhaus gasses, lowering the air pressure underneath the flaperon, thereby sucking the flaperon (with actuator bypass active) down. I have read a couple of years ago, that flaperon actuators are bypassed in some conditions to lower the actuator wear.

 

 

Is either of those correct?

I can't believe this is simulated. Where can I find this video by Froogle?

Edit:

Found here : https://www.facebook.com/Frooglesim?hc_location=stream

With all the little quirks in the NGX, why do you have such a hard time believing this isn't simulated?

With all the little quirks in the NGX, why do you have such a hard time believing this isn't simulated?

You got me there; this is PMDG after all. But I don't know. When I first saw this, I couldn't believe that even PMDG would simulate something of this depth.

I too am mightilly impressed.

Are these called high speed ailerons or flapperons? My dad used to work for BA maintenance on this particular aircraft and 747. He calls them high speed ailerons.

 

Regards,

 

Fly UK - Head of Operations

 

Jordan McTiffin

 

 

I am not really sure about the official name.

Functionally, they definitely fulfill the definition of flaperon.