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Why Were The DC-10 Wings Slightly Slanted Down...?  
User currently offlineChicago757 From United States of America, joined May 2003, 382 posts, RR: 1
Posted (11 years 3 months 1 week 1 day 4 hours ago) and read 4716 times:

I was just wondering why the DC-10 wings were slightly slanted down, whereas all other aircraft have them slightly tilted up, especially like the 777.


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20 replies: All unread, jump to last
 
User currently offlineTimz From United States of America, joined Sep 1999, 6896 posts, RR: 7
Reply 1, posted (11 years 3 months 1 week 1 day 4 hours ago) and read 4584 times:

Show us a pic that shows them slanting down.

A swept-wing aircraft with no dihedral and the wing set on the fuselage at positive incidence will (of course) have tips lower than roots-- but doesn't the DC-10 have dihedral?


User currently offlineCitationJet From United States of America, joined Mar 2003, 2457 posts, RR: 3
Reply 2, posted (11 years 3 months 1 week 1 day 3 hours ago) and read 4583 times:

Looks like dihedral to me
I am not sure what you mean by "slanted down"?

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[Edited 2003-08-22 19:55:23]


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User currently offlineHAL From United States of America, joined Jan 2002, 2568 posts, RR: 53
Reply 3, posted (11 years 3 months 1 week 1 day ago) and read 4508 times:

The DC-10 had dihedral (up-slant) like all other airliners. However if completely filled with fuel, they drooped a bit on the ground, making it look like less dihedral until they took off.

HAL



One smooth landing is skill. Two in a row is luck. Three in a row and someone is lying.
User currently offlineChicago757 From United States of America, joined May 2003, 382 posts, RR: 1
Reply 4, posted (11 years 3 months 1 week 22 hours ago) and read 4472 times:


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..............looks slightly slanted downward to me....?



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User currently offlineChicago757 From United States of America, joined May 2003, 382 posts, RR: 1
Reply 5, posted (11 years 3 months 1 week 22 hours ago) and read 4467 times:

...........and here.............i dont know....maybe its just perception.

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User currently offlineMITaero From United States of America, joined Jul 2003, 497 posts, RR: 8
Reply 6, posted (11 years 3 months 1 week 21 hours ago) and read 4466 times:

The high dihedral on the tail might make it tough to see the real angle of the wings.. also, those pics are probably of a/c loaded down with fuel.

User currently offlineHAL From United States of America, joined Jan 2002, 2568 posts, RR: 53
Reply 7, posted (11 years 3 months 1 week 21 hours ago) and read 4468 times:

Believe me - I've spent countless hours doing preflight inspections on DC-10's, and have seen them in all phases of flight. The wings have positive dihedral, and do sweep up.

The photos probably look that way because of an odd perspective from where the photo was taken, or possible using a wide angle lens that slightly distorted the lines in the picture.

Either way, I promise you that the DC-10 wings do not have a negative dihedral.

HAL



One smooth landing is skill. Two in a row is luck. Three in a row and someone is lying.
User currently offlineATA L1011 From United States of America, joined Feb 2001, 1388 posts, RR: 6
Reply 8, posted (11 years 3 months 1 week 21 hours ago) and read 4462 times:

Well on the ground the 10's wing dont slope upward like a L1011, or 767 they do have a downward/flat angle 30 feet on towards the tip, here is a perfect example of that on the KC10. even at the gate when a DC10 is parked next to a L1011,767 or 747 its wingtip sits lower than theirs does at the tip.


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See the difference between the 10, and the rest it does have a flat/Downward slope vs the upward slope of the rest from about20-30 feet on toward the tip..

[Edited 2003-08-23 02:14:02]

[Edited 2003-08-23 02:22:18]

[Edited 2003-08-23 02:27:54]


Treat others as you expect to be treated!
User currently offlineLiamksa From Australia, joined Oct 2001, 308 posts, RR: 0
Reply 9, posted (11 years 3 months 1 week 18 hours ago) and read 4416 times:

Anhedral:-


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User currently offlineChicago757 From United States of America, joined May 2003, 382 posts, RR: 1
Reply 10, posted (11 years 3 months 1 week 15 hours ago) and read 4389 times:

ATA L1011 ..................THANK YOU!!! Everyone is going against me but you've backed me up on this. I thought i stood alone on this one....Thanks!


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User currently offlineMITaero From United States of America, joined Jul 2003, 497 posts, RR: 8
Reply 11, posted (11 years 3 months 1 week 12 hours ago) and read 4370 times:

Dude, we're just talking about facts here.. no opinions, so no one can or should back you up unless what you say is a fact.  Smile

ATA was just saying that the dihedral on a DC-10 is just less pronounced than on other a/c (I agree). The DC-10 definitely does not have anhedral. Especially when it takes off, the lift distribution pushes the wings upward even further.


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User currently offlineBeefmoney From United States of America, joined Oct 2000, 1118 posts, RR: 4
Reply 12, posted (11 years 3 months 1 week 1 hour ago) and read 4332 times:

OK, once and for all, the DC-10 DOES NOT have "down sloped" wings. They just appear to droop when on the ground because of the weight of the wings, fuel, engines, etc...

I dont know why the drooping is more pronounced on the DC-10, but it most certainly is not anhedral that you are seeing.


User currently offlineFlyingbronco05 From United States of America, joined May 2002, 3840 posts, RR: 2
Reply 13, posted (11 years 3 months 6 days 17 hours ago) and read 4258 times:

Anhedral:


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 Laugh out loud

[Edited 2003-08-24 05:57:05]


Never Trust Your Fuel Gauge
User currently offlineTimz From United States of America, joined Sep 1999, 6896 posts, RR: 7
Reply 14, posted (11 years 3 months 6 days 1 hour ago) and read 4191 times:

The B-52 doesn't have anhedral, does it? It's just a good example of a swept-wing aircraft with a positive-incidence wing?

User currently offlineMusang From United Kingdom, joined Apr 2001, 872 posts, RR: 7
Reply 15, posted (11 years 3 months 6 days ago) and read 4169 times:

This is bizarre!

Just find a three way profile drawing of the aircraft and look at the head on view!!

Regards - Musang


User currently offlineJwenting From Netherlands, joined Apr 2001, 10213 posts, RR: 19
Reply 16, posted (11 years 3 months 5 days 17 hours ago) and read 4122 times:

up

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down?

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up

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down?

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Photo © J.T. Wenting



yes, DC-10 wings do seem to have a slight anhedral sometimes and slight dihedral at other times.
Maybe it's because they have neither and we're so used to seeing strong dihedral that it looks like they have an anhedral instead.

B-52 wings when sitting on the ground droop down strongly, when flying (especially loaded with fuel) they bend up more than just about any other wing. They are AFAIK the most flexible wings out there with the possible exception of the U-2.




I wish I were flying
User currently offlineFredT From United Kingdom, joined Feb 2002, 2185 posts, RR: 26
Reply 17, posted (11 years 3 months 5 days 14 hours ago) and read 4094 times:

It was quite apparent on the DC10s and MD11 that they came in with dihedral, ended up with a slight anhedral of sorts (drooping wings) when refuelled and again had dihedral when they took to the air.

An impressive difference in height of the wingtip when fuelled vs when empty!

But aerodynamically speaking, it is dihedral.

Cheers,
Fred



I thought I was doing good trying to avoid those airport hotels... and look at me now.
User currently offlineTimz From United States of America, joined Sep 1999, 6896 posts, RR: 7
Reply 18, posted (11 years 3 months 5 days 4 hours ago) and read 4070 times:

"This is bizarre!"

Which way?

The B-47 and B-52 have bicycle landing gear, which means they can't rotate on takeoff, which means the wing must have a positive incidence. Looking at the usual sort of three-view of the B-52, where the view is along the axis of the fuselage, you're getting an angled view of the bottom of the wing. Dunno if the B-52's wing has twist, but if it doesn't, I'm guessing the leading and trailing edges are all in one plane. And I'm guessing the B-47 is the same. I guess you could define anhedral to include the B-47/B-52, but I suspect the "official" definition is that the plane of the left wing doesn't coincide with the plane of the right.



User currently offlineDc10hound From United States of America, joined Dec 2000, 463 posts, RR: 5
Reply 19, posted (11 years 3 months 5 days 3 hours ago) and read 4033 times:

An impressive difference in height of the wingtip when fuelled vs when empty!

During normal operations of a DC-10, the outboard compartments of tanks 1 and 3 are always full of fuel. The fuel in the "tip" tanks is the last to burn. Most large airliners operate like that.

It reduces the bending moment on the wing.



"Eagles soar. But weasels never get sucked into jet intakes.."
User currently offlineMITaero From United States of America, joined Jul 2003, 497 posts, RR: 8
Reply 20, posted (11 years 3 months 4 days 22 hours ago) and read 4017 times:

Good point Dc10hound.. that would help internal bending moment near the wing root.

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