jtl11968
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Why Do These Wings Have Weights?

Fri Aug 24, 2012 4:29 am

The reason is probably obvious to many but I'm an airplane geek without much manufacturing knowledge.

Why do the aircraft in the picture have the weights hanging from the wings?

http://www.airliners.net/photo/Air-I...eing-787-837-Dreamliner/2150597/M/
 
jetmatt777
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RE: Why Do These Wings Have Weights?

Fri Aug 24, 2012 4:33 am

Just a guess, but those weights are where the engines would normally mount. I'm assuming the weights are there to prevent the wing from flexing near the wing root while there is no permanent weight hanging from the engine mounting areas.
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BreninTW
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RE: Why Do These Wings Have Weights?

Fri Aug 24, 2012 4:38 am

I believe it's mostly to stop the aircraft tipping backwards -- the engines are typically mounted forward of the center of gravity of an aircraft, and they're heavy.

Without the engines, there's a very real risk of the aircraft tipping backwards, especially in windy conditions.
 
AR385
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RE: Why Do These Wings Have Weights?

Fri Aug 24, 2012 4:47 am

I may be wrong, but extrapolating from the 747 history, that was a common sight early in the delivery schedule because although the frames were ready, the engines were behind schedule. Without those weights, the 747 tilted backwards.

I assume that is the case with these 787s.
 
blueflyer
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RE: Why Do These Wings Have Weights?

Fri Aug 24, 2012 5:25 am

Put replies #1 and #2 together and you have the answer.

The 787 delays are notorious. No need to spend money to buy engines that are not (yet) needed.
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XFSUgimpLB41X
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RE: Why Do These Wings Have Weights?

Fri Aug 24, 2012 5:40 am

Aren't those aircraft awaiting structural strengthening?
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FI642
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RE: Why Do These Wings Have Weights?

Fri Aug 24, 2012 2:29 pm

Engines provide a lot of forward CG for the aircraft. I have seem weights attached to an aircraft awaiting an engine change.
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INFINITI329
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RE: Why Do These Wings Have Weights?

Fri Aug 24, 2012 2:35 pm

The weights I would assume is the average weight of engine and nacelle?
 
DualQual
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RE: Why Do These Wings Have Weights?

Fri Aug 24, 2012 3:30 pm

Quoting XFSUgimpLB41X (Reply 5):

Aren't those aircraft awaiting structural strengthening?


Training with those weights should build the strength      

Sorry, couldn't resist!
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Stitch
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RE: Why Do These Wings Have Weights?

Fri Aug 24, 2012 3:32 pm

Quoting XFSUgimpLB41X (Reply 5):
Aren't those aircraft awaiting structural strengthening?

Assuming they're early builds, they would be in need of change incorporation and re-work.
 
9lflyguy
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RE: Why Do These Wings Have Weights?

Fri Aug 24, 2012 5:55 pm

Not to be off topic too much but since we're discussing the photo, what are the two WN jets doing at KPAE i(upper right hand corner)? Are these new deliveries or conversions from AirTran? Just want more information on those two birds.
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Ronaldo747
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RE: Why Do These Wings Have Weights?

Fri Aug 24, 2012 6:20 pm

Quoting 9lflyguy (Reply 10):

IIRC the 738 gets LifeTV or similar systems at PAE. All SWA 738 flies to PAE after delivery at first before entry intro service.
 
airplanenut
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RE: Why Do These Wings Have Weights?

Fri Aug 24, 2012 6:52 pm

Quoting 9lflyguy (Reply 10):

Not to be off topic too much but since we're discussing the photo, what are the two WN jets doing at KPAE i(upper right hand corner)? Are these new deliveries or conversions from AirTran? Just want more information on those two birds.

A good amount of maintenance is done at PAE. AS and SW both have 737s going in and out daily, and there are also some DL birds (mostly MD80s).

Quoting infiniti329 (Reply 7):
The weights I would assume is the average weight of engine and nacelle?

If memory serves correctly, those are marked around 15,000lbs each.
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747-600X
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RE: Why Do These Wings Have Weights?

Sat Aug 25, 2012 1:06 am

The risk of them tipping backwards seems to be relatively low, given that the nose gear strut appears tethered to the ground. (Although this raises the question of why there would be tie-downs in the middle of a runway...)
 
nomadd22
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RE: Why Do These Wings Have Weights?

Sat Aug 25, 2012 1:39 am

Quoting 747-600X (Reply 13):
The risk of them tipping backwards seems to be relatively low, given that the nose gear strut appears tethered to the ground. (Although this raises the question of why there would be tie-downs in the middle of a runway...)

That doesn't really follow. You don't want to hold a plane down by the nose gear.
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adam42185
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RE: Why Do These Wings Have Weights?

Sat Aug 25, 2012 2:40 am

Quoting DualQual (Reply 8):

Training with those weights should build the strength

Sorry, couldn't resist!

I lift things up and put them down!
 
vaus77w
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RE: Why Do These Wings Have Weights?

Sat Aug 25, 2012 4:08 am

Quoting AR385 (Reply 3):
I may be wrong, but extrapolating from the 747 history, that was a common sight early in the delivery schedule because although the frames were ready, the engines were behind schedule. Without those weights, the 747 tilted backwards.

This video demonstrates this:
http://www.youtube.com/watch?v=cHhZwvdRR5c
 
QANTAS747-438
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RE: Why Do These Wings Have Weights?

Sat Aug 25, 2012 4:34 am

Quoting 9lflyguy (Reply 10):
Not to be off topic too much but since we're discussing the photo, what are the two WN jets doing at KPAE i(upper right hand corner)? Are these new deliveries or conversions from AirTran? Just want more information on those two birds.

I think they are new deliveries... N8319F and N8320J, -800s.
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wjcandee
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RE: Why Do These Wings Have Weights?

Sat Aug 25, 2012 5:09 am

Quoting adam42185 (Reply 15):
I lift things up and put them down!

One of the greatest gym commercials ever. Almost joined just to reward them for that!

http://www.youtube.com/watch?v=eOSeOieLh7s
 
justplanesmart
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RE: Why Do These Wings Have Weights?

Sun Aug 26, 2012 1:01 am

Quoting QANTAS747-438 (Reply 17):
I think they are new deliveries... N8319F and N8320J, -800s.

Those two have not been delivered yet, having just made their first flights this week (August 23). Also, the aircraft toward the rear clearly has only one over-wing exit. It might be N7734H, formerly N300AT, which just flew overnight (August 25) from Paine to Sea-Tac for reentry into service.
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