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787 Strives To Shed Pounds  
User currently offlineBoomBoom From , joined Dec 1969, posts, RR:
Posted (8 years 10 months 5 days 1 hour ago) and read 1826 times:

New 787 goes on diet

Quote:
A binge of design tweaks this fall had triggered a rapid weight gain. Just a month ago, Boeing was 5,800 pounds over its target weight of 222,000 pounds for the base version 787-8

Within the past fortnight, the airplane went on a diet and shed a dramatic 2,500 pounds.

"It was no single big thing," she said, "There were a lot of 1- and 2- and 10-pound savings."

http://seattletimes.nwsource.com/htm...aerospace/2002628489_boeing17.html

[Edited 2005-11-17 16:31:32]

5 replies: All unread, jump to last
 
User currently offlineJetMaster From , joined Dec 1969, posts, RR:
Reply 1, posted (8 years 10 months 5 days ago) and read 1798 times:

The link isn't the right one...

Anyways, no surprise a new design involves the need for weight savings during development. It will work out fine in the end.


Regards,
JM


User currently offlinePavlin From , joined Dec 1969, posts, RR:
Reply 2, posted (8 years 10 months 5 days ago) and read 1794 times:

Are you sure? Isn't a bit to early to weight a plane that hasn't even been built?

User currently offlineBoomBoom From , joined Dec 1969, posts, RR:
Reply 3, posted (8 years 10 months 5 days ago) and read 1745 times:

Quoting JetMaster (Reply 1):
The link isn't the right one...

Thanks, I fixed the link.

There are actually two stories in one article. The other concerned doubling production of the 787. I created another thread on that topic in an attempt to keep the discussion focused.


User currently offlineLuisca From , joined Dec 1969, posts, RR:
Reply 4, posted (8 years 10 months 5 days ago) and read 1742 times:

Quoting Pavlin (Reply 2):
Are you sure? Isn't a bit to early to weight a plane that hasn't even been built?

From what I understand, with CATIA (Boeing's computer CAD type design program) you can predict the weight of the airframe. I remember they had the same problem with the 777-200. In the design room their was a billboard with days left till initial assembly and pounds left to shed. Very funny actually. In the end they exceeded the weight target.

Its all in a series of videos about the 777 design process called 21st century jet. Unfortunately I don't have a VCR and I am sure it is not on DVD.


User currently offlineRoseFlyer From United States of America, joined Feb 2004, 9637 posts, RR: 52
Reply 5, posted (8 years 10 months 5 days ago) and read 1670 times:

Quoting Pavlin (Reply 2):
Are you sure? Isn't a bit to early to weight a plane that hasn't even been built?

If they didn't have any issues about needing to keep the weight down, then the target would have been too high. It doesn't take until the plane is built for weight considerations to be made. Boeing probably knows more accurately the weight of all components going on the plane now since most of the designs are getting finalized. If there weren't any concerns, then the projected figure would have been too high since it should be a goal to pick to lowest achievable goal. Now McDonnell Douglas on the other hand with the MD-11 went beyond the lower limit in its projection and ended up with a design that failed to meet specifications. While it is too early for us to be certain of the performance characteristic of the 787, there should be no surprises in engineering if things are done correctly.



If you have never designed an airplane part before, let the real designers do the work!
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