chicago757
Posts: 348
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Why Were The DC-10 Wings Slightly Slanted Down...?

Sat Aug 23, 2003 1:45 am

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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timz
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RE: Why Were The DC-10 Wings Slightly Slanted Down...?

Sat Aug 23, 2003 2:36 am

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?
 
citationjet
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RE: Why Were The DC-10 Wings Slightly Slanted Down...?

Sat Aug 23, 2003 2:54 am

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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HAL
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RE: Why Were The DC-10 Wings Slightly Slanted Down...?

Sat Aug 23, 2003 6:14 am

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.
 
chicago757
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RE: Why Were The DC-10 Wings Slightly Slanted Down...?

Sat Aug 23, 2003 8:30 am


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..............looks slightly slanted downward to me....?
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chicago757
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RE: Why Were The DC-10 Wings Slightly Slanted Down...?

Sat Aug 23, 2003 8:34 am

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

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MITaero
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RE: Why Were The DC-10 Wings Slightly Slanted Down...?

Sat Aug 23, 2003 8:43 am

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.
 
HAL
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RE: Why Were The DC-10 Wings Slightly Slanted Down...?

Sat Aug 23, 2003 8:44 am

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.
 
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ATA L1011
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RE: Why Were The DC-10 Wings Slightly Slanted Down...?

Sat Aug 23, 2003 9:04 am

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]
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liamksa
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RE: Why Were The DC-10 Wings Slightly Slanted Down...?

Sat Aug 23, 2003 12:29 pm

Anhedral:-


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chicago757
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RE: Why Were The DC-10 Wings Slightly Slanted Down...?

Sat Aug 23, 2003 3:16 pm

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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MITaero
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RE: Why Were The DC-10 Wings Slightly Slanted Down...?

Sat Aug 23, 2003 6:39 pm

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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Beefmoney
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RE: Why Were The DC-10 Wings Slightly Slanted Down...?

Sun Aug 24, 2003 5:09 am

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.
 
flyingbronco05
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RE: Why Were The DC-10 Wings Slightly Slanted Down...?

Sun Aug 24, 2003 12:55 pm

Anhedral:


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[Edited 2003-08-24 05:57:05]
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timz
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RE: Why Were The DC-10 Wings Slightly Slanted Down...?

Mon Aug 25, 2003 5:24 am

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?
 
musang
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RE: Why Were The DC-10 Wings Slightly Slanted Down...?

Mon Aug 25, 2003 6:37 am

This is bizarre!

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

Regards - Musang
 
jwenting
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RE: Why Were The DC-10 Wings Slightly Slanted Down...?

Mon Aug 25, 2003 1:13 pm

up

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down?

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up

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down?

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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.

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FredT
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RE: Why Were The DC-10 Wings Slightly Slanted Down...?

Mon Aug 25, 2003 3:52 pm

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
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timz
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RE: B-52/B-47 "anhedral"

Tue Aug 26, 2003 2:10 am

"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.

 
dc10hound
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RE: Why Were The DC-10 Wings Slightly Slanted Down...?

Tue Aug 26, 2003 3:27 am

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.
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MITaero
Posts: 485
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RE: Why Were The DC-10 Wings Slightly Slanted Down...?

Tue Aug 26, 2003 8:27 am

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

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