Fokker50
Topic Author
Posts: 344
Joined: Fri Jun 25, 2004 10:34 am

MD 11 Structural Problems?

Thu Jul 29, 2004 9:28 am

Hi, I was observing this photo, and I was questioning, does the nose gear of the MD is in a bad structural position??


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Photo © Europix



Fokker50
Bogota, the South american gateway!
 
Aerosvit
Posts: 109
Joined: Mon Feb 23, 2004 6:59 am

RE: MD 11 Structural Problems?

Thu Jul 29, 2004 9:32 am

prehaps its because the ground is on a slant...
Clava Ykraini
 
Klaus
Posts: 20622
Joined: Wed Jul 11, 2001 7:41 am

RE: MD 11 Structural Problems?

Thu Jul 29, 2004 9:37 am

The A320 series has the same design. The only good reason I could think of would be that it´s self-centering that way... (maybe as another level of safety in case something happens to the actuators during takeoff or landing roll, or simply for smoother control with less vibrations at higher speeds)
 
EMBQA
Posts: 7798
Joined: Sat Oct 25, 2003 3:52 am

RE: MD 11 Structural Problems?

Thu Jul 29, 2004 9:53 am

VERY common under hard turning situations and no big deal. I've seen several other airframes do that and while taxing I've done it myself.
"It's not the size of the dog in the fight, but the size of the fight in the dog"
 
b727fan
Posts: 238
Joined: Mon Apr 26, 2004 8:54 am

RE: MD 11 Structural Problems?

Thu Jul 29, 2004 11:02 am

Klaus I think you're right. In fact, German engineers have also implemented this sort of design characteristics in their cars. Turn the wheel on any German car full swing and you'll notice that wheels are slanted, thus resulting in more stability and better handling. But in case of planes, I think your explanation makes good sense.
 
ua777222
Posts: 2987
Joined: Mon Dec 22, 2003 11:23 am

RE: MD 11 Structural Problems?

Thu Jul 29, 2004 11:25 am


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Photo © Wietse de Graaf - AirTeamImages




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Photo © Carlos A. Morillo Doria



You can bend any gear if you try hard enough. Some more than others. If anything it shows that it's well designed b/c you straighten it back out and the a/c has no issues. Think of a car in the intersection. If another car comes and hits it's back or front from the side it will spin (the hitting car (force) would be the power from the thrust) but if you hit it dead on right in the middle of the car it will go forward. This is simple physics, not the a/c.

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UA777222
"It wasn't raining when Noah built the ark."
 
Max Q
Posts: 5645
Joined: Wed May 09, 2001 12:40 pm

RE: MD 11 Structural Problems?

Thu Jul 29, 2004 11:41 am

Had the same problem on the md80, for some reason best known to Douglas the nosewheel strut is mounted at a forward slant.


As a result in a tight turn the outside nosewheel will lift of the ground making steering very tricky especially on a wet or icy surface.

Turning onto a runway in boston we hit a slippery patch and nearly went off the side.

Bad design, same on the DC10 but that was the least of it's problems...
The best contribution to safety is a competent Pilot.
 
broke
Posts: 1299
Joined: Wed Apr 24, 2002 8:04 pm

RE: MD 11 Structural Problems?

Fri Jul 30, 2004 1:45 am

One advantage to a nose gear like this is that you can change a nose gear tire without having to jack the airplane. Just turn the nose gear all the way to the opposite side of the tire you need to change. The DC-9 has a similar feature and not having to jack the airplane has saved a lot of time.