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MD-11 Flap Hinge Fairings  
User currently offlinetsugambler From United States of America, joined Jul 2010, 302 posts, RR: 0
Posted (3 years 10 months 2 weeks 2 days 19 hours ago) and read 4265 times:

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?

11 replies: All unread, jump to last
 
User currently offlineGearDownFlaps30 From Switzerland, joined Sep 2010, 25 posts, RR: 0
Reply 1, posted (3 years 10 months 2 weeks 2 days 19 hours ago) and read 4235 times:

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
User currently offlinetsugambler From United States of America, joined Jul 2010, 302 posts, RR: 0
Reply 2, posted (3 years 10 months 2 weeks 2 days 18 hours ago) and read 4223 times:

I've seen lots of pictures of Saudi Arabian Cargo MD-11s with the more aerodynamic hinge fairings, too...

User currently offlinesoon7x7 From , joined Dec 1969, posts, RR:
Reply 3, posted (3 years 10 months 2 weeks 2 days 10 hours ago) and read 4118 times:

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.

User currently offlineAA737-823 From United States of America, joined Mar 2000, 5813 posts, RR: 11
Reply 4, posted (3 years 10 months 2 weeks 2 days 3 hours ago) and read 4073 times:

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.


User currently offlinemusang From United Kingdom, joined Apr 2001, 864 posts, RR: 7
Reply 5, posted (3 years 10 months 2 weeks 1 day 23 hours ago) and read 3989 times:

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

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

Regards - musang


User currently offlineN901WA From United States of America, joined Oct 2009, 461 posts, RR: 0
Reply 6, posted (3 years 10 months 2 weeks 1 day 22 hours ago) and read 3972 times:

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

User currently offlinetsugambler From United States of America, joined Jul 2010, 302 posts, RR: 0
Reply 7, posted (3 years 10 months 2 weeks 1 day 18 hours ago) and read 3925 times:

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?


User currently offlineGearDownFlaps30 From Switzerland, joined Sep 2010, 25 posts, RR: 0
Reply 8, posted (3 years 10 months 2 weeks 1 day 18 hours ago) and read 3919 times:

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
User currently offlineN685FE From United States of America, joined Dec 2003, 451 posts, RR: 11
Reply 9, posted (3 years 10 months 2 weeks 17 hours ago) and read 3782 times:

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
User currently offlineDocLightning From United States of America, joined Nov 2005, 19688 posts, RR: 58
Reply 10, posted (3 years 10 months 1 week 6 days 16 hours ago) and read 3671 times:

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.


User currently offlineUAL747 From , joined Dec 1969, posts, RR:
Reply 11, posted (3 years 10 months 1 week 6 days 7 hours ago) and read 3609 times:

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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