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Why Do These Wings Have Weights?  
User currently offlinejtl11968 From United States of America, joined May 2007, 41 posts, RR: 0
Posted (2 years 5 days 16 hours ago) and read 15361 times:

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/

19 replies: All unread, jump to last
 
User currently offlinejetmatt777 From United States of America, joined Jun 2005, 2779 posts, RR: 33
Reply 1, posted (2 years 5 days 16 hours ago) and read 15341 times:

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.


No info
User currently offlineBreninTW From Taiwan, joined Jul 2006, 1633 posts, RR: 1
Reply 2, posted (2 years 5 days 16 hours ago) and read 15314 times:

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.



I'm tired of the A vs. B sniping. Neither make planes that shed wings randomly!
User currently onlineAR385 From Mexico, joined Nov 2003, 6187 posts, RR: 30
Reply 3, posted (2 years 5 days 16 hours ago) and read 15284 times:
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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.



MGGS
User currently offlineblueflyer From United States of America, joined Jan 2006, 3971 posts, RR: 2
Reply 4, posted (2 years 5 days 15 hours ago) and read 15167 times:
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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.



I've got $h*t to do
User currently offlineXFSUgimpLB41X From United States of America, joined Aug 2000, 4195 posts, RR: 37
Reply 5, posted (2 years 5 days 15 hours ago) and read 15117 times:

Aren't those aircraft awaiting structural strengthening?


Chicks dig winglets.
User currently offlineFI642 From Monaco, joined Mar 2005, 1079 posts, RR: 2
Reply 6, posted (2 years 5 days 6 hours ago) and read 14372 times:

Engines provide a lot of forward CG for the aircraft. I have seem weights attached to an aircraft awaiting an engine change.


737MAX, Cool Planes for the Worlds Coolest Airline.
User currently offlineinfiniti329 From United States of America, joined Jul 2012, 652 posts, RR: 0
Reply 7, posted (2 years 5 days 6 hours ago) and read 14350 times:

The weights I would assume is the average weight of engine and nacelle?

User currently offlineDualQual From United States of America, joined Mar 2006, 765 posts, RR: 1
Reply 8, posted (2 years 5 days 5 hours ago) and read 14150 times:

Quoting XFSUgimpLB41X (Reply 5):

Aren't those aircraft awaiting structural strengthening?


Training with those weights should build the strength      

Sorry, couldn't resist!


User currently onlineStitch From United States of America, joined Jul 2005, 30902 posts, RR: 87
Reply 9, posted (2 years 5 days 5 hours ago) and read 14130 times:
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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.


User currently offline9lflyguy From United States of America, joined Jan 2010, 164 posts, RR: 0
Reply 10, posted (2 years 5 days 2 hours ago) and read 12747 times:

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.


My opinions do not represent the opinions of my company. They are solely the opinion of the poster.
User currently offlineRonaldo747 From United States of America, joined Feb 2009, 377 posts, RR: 0
Reply 11, posted (2 years 5 days 2 hours ago) and read 12178 times:

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.


User currently offlineairplanenut From United States of America, joined Sep 2001, 654 posts, RR: 0
Reply 12, posted (2 years 5 days 1 hour ago) and read 11590 times:

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.



Why yes, in fact, I am a rocket scientist...
User currently offline747-600X From United States of America, joined Jan 2000, 2789 posts, RR: 15
Reply 13, posted (2 years 4 days 19 hours ago) and read 6802 times:

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...)


"Mental health is reality at all cost." -- M. Scott Peck, 'The Road Less Traveled'
User currently offlinenomadd22 From United States of America, joined Feb 2008, 1856 posts, RR: 0
Reply 14, posted (2 years 4 days 19 hours ago) and read 6451 times:

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.



Andy Goetsch
User currently offlineadam42185 From United States of America, joined Dec 2005, 414 posts, RR: 0
Reply 15, posted (2 years 4 days 18 hours ago) and read 5809 times:

Quoting DualQual (Reply 8):

Training with those weights should build the strength

Sorry, couldn't resist!

I lift things up and put them down!


User currently offlinevaus77w From Australia, joined Aug 2011, 143 posts, RR: 0
Reply 16, posted (2 years 4 days 16 hours ago) and read 5068 times:

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


User currently offlineQANTAS747-438 From United States of America, joined Jan 2001, 1937 posts, RR: 2
Reply 17, posted (2 years 4 days 16 hours ago) and read 4828 times:

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.



My posts/replies are strictly my opinion and not that of any company, organization, or Southwest Airlines.
User currently offlinewjcandee From United States of America, joined Jun 2000, 5154 posts, RR: 22
Reply 18, posted (2 years 4 days 15 hours ago) and read 4766 times:

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


User currently offlinejustplanesmart From United States of America, joined Mar 2001, 722 posts, RR: 2
Reply 19, posted (2 years 3 days 19 hours ago) and read 4236 times:

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.



"So many planes; so little time..."
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