tsugambler
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MD-11 Flap Hinge Fairings

Thu Nov 04, 2010 8:24 pm

I've noticed that some of the (relatively) newer MD-11s have differently-shaped flap hinge fairings than the older ones. The original MD-11s had flap hinge fairings that were essentially the same as the DC-10's, but at some point the shape was change to a longer, more pointed design that extended rearward past the trailing edge of the flaps.

1) I'm assuming this shape reduces drag--is this correct?

2) When did the new fairing design start appearing? Was it included on all of the new-build MD-11s after it was introduced, or was it on a "by-request" basis? Was it available as an upgrade to older models?
 
GearDownFlaps30
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RE: MD-11 Flap Hinge Fairings

Thu Nov 04, 2010 8:59 pm

Hi,

I assume these new flap hinge fairings were designed in order to improve aerodynamics, sounds logical, some sort of late "PIP". So far only KLM equipped their MD-11s with these special flap hinge fairings.

Sorry I can't be of more help...
Ciao, Steven
 
tsugambler
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RE: MD-11 Flap Hinge Fairings

Thu Nov 04, 2010 9:23 pm

I've seen lots of pictures of Saudi Arabian Cargo MD-11s with the more aerodynamic hinge fairings, too...
 
soon7x7
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RE: MD-11 Flap Hinge Fairings

Fri Nov 05, 2010 5:23 am

These mods were also on the MD 90 series and some earlier models. Typically a redesign whose aim was to increase fuel economy in the long run by reducing drag.
 
AA737-823
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RE: MD-11 Flap Hinge Fairings

Fri Nov 05, 2010 12:10 pm

Quoting GearDownFlaps30 (Reply 1):
I assume these new flap hinge fairings were designed in order to improve aerodynamics, sounds logical, some sort of late "PIP". So far only KLM equipped their MD-11s with these special flap hinge fairings.

EVA Taiwan Cargo also has them.

I believe they were a part of the PIP, yes, which included (among other things) changing the windscreen wipers to a vertically-stowed position, rather than horizontally-stowed. This was more aerodynamic, as you might picture.

But yes, due to the MD-11 not meeting performance guarantees, MD came up with a PIP as fast as they could.
 
musang
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RE: MD-11 Flap Hinge Fairings

Fri Nov 05, 2010 4:50 pm

http://www.airliners.net/photo/Swiss...d=9f4c266dee4d1918bc3fe3d9cc5ab6bb

This pic would suggest that Swissair had the mod. LH cargo also have some.

Regards - musang
 
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n901wa
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RE: MD-11 Flap Hinge Fairings

Fri Nov 05, 2010 5:53 pm

The Bat Plane fairings   I Know Delta had them on ship 815, and Martin Air had them on a few MD-11F's
 
tsugambler
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RE: MD-11 Flap Hinge Fairings

Fri Nov 05, 2010 9:12 pm

Quoting soon7x7 (Reply 3):
These mods were also on the MD 90 series and some earlier models.

Yeah, I noticed the fairings on the MD-90s were different from the MD-80s... but they're also quite a different shape than those on the updated MD-11s. The MD-11s flap hinge fairings have a slope leading up to the hinge joint, and then a slope back down away from it to where it joins with the flap, whereas the MD-90 has more of a "pod" of sorts at the hinge joint, making the longest section of the hinge at the joint itself, rather than where it joins the flap. Which of these is more aerodynamically efficient, I wonder?
 
GearDownFlaps30
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RE: MD-11 Flap Hinge Fairings

Fri Nov 05, 2010 9:43 pm

To all, my apologies for the wrong info I posted, I was under the impression only KLM had these new fairings installed...

I am amazed at how many customers ended up selecting these PIP, the MD-11 seemed to need them badly though I read many contradictory info regarding its economics, some saying it performed pretty well by mid-life while other saying it never met it's targets.

Anyway, efficient or not, it remains a splendid airliner, I just cannot get enough of these PW4460/4462 or CF6-80C2D1F roar, it seems that 3 of them combined produce quite an unique sound that could not be mistaken with something else.
Ciao, Steven
 
n685fe
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RE: MD-11 Flap Hinge Fairings

Sat Nov 06, 2010 10:50 pm

Quoting GearDownFlaps30 (Reply 8):
Anyway, efficient or not, it remains a splendid airliner, I just cannot get enough of these PW4460/4462 or CF6-80C2D1F roar, it seems that 3 of them combined produce quite an unique sound that could not be mistaken with something else.

I too enjoy the sound they make, three engines spooling up is quite different along with the 777 sucking in all air. Surprisingly, I think the A319/320 has a unique sound also. It sounds like a big boy, when you turn around to look for a widebody and you see the little Airbus lined up to go I think to myself, "Yeah you go little guy."   
psp. lead by example
 
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DocLightning
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RE: MD-11 Flap Hinge Fairings

Sun Nov 07, 2010 11:08 pm

I believe that these are to help the aerodynamics.

The larger, longer flap canoes are basically Whicomb antishock bodies. They soften the sudden decrease in aircraft cross-section at the trailing edge of the wing.
-Doc Lightning-

"The sky calls to us. If we do not destroy ourselves, we will one day venture to the stars."
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UAL747
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RE: MD-11 Flap Hinge Fairings

Mon Nov 08, 2010 8:12 am

They are Aerodynamic modifications made by MD on late production MD-11's (Boeing too). I personally haven't flown on an MD-11 with them, but they are the same exact hinge as the earlier MD-11's and DC-10's, just have more trailing edge that extends beyond the wing.

Personally, I think the old style looks better, but here's an EVA Air I shot the other day from an AA 757 going to LAX.

http://sphotos.ak.fbcdn.net/hphotos-ak-snc4/hs308.snc4/40755_875662143977_9609877_46117129_4736416_n.jpg

You'll notice that the inner most hinge does not have the aerodynamic addition. These are NOT canoes like the Boeings or Airbus.
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