trex8
Posts: 4657
Joined: Sat Nov 02, 2002 9:04 am

A350 Weight

Thu Mar 24, 2005 9:14 am

In Flight Intl a month or two back they had an article about the A350 and IIRC they said that with the use of composites etc etc in the airframe they would reduce the A350s weight by x compared to the a330. But because of something to do with the new generation engines being heavier or needing a heavier pylon, actual weight reduction would be less than x by a certain amount (IIRC it was maybe 1 or 2 metric tons per plane).

In AWST this week, they have a whole article (well, actually more like an advert) on the 787 suppliers and the GenX engine etc is supposed to save 350kg in weight vs a similar engine without composite casing, blades etc.

So whats with the A350 engines or the pylon (supposedly the same basic engine as the 787s but with bleed air) being heavy. Is it all related to the associated bleed air systems?? Or is there something else I am missing or misunderstood?


(Interestingly, if I read the AWST article correctly, the 20% fuel savings that the 787 will have over present planes (presumably the 767) is something like 13% from composite airframe structure, 3% from bleedless systems, 3% from improved aerodynamics.)
 
QFA001
Posts: 651
Joined: Sat May 27, 2000 6:47 am

RE: A350 Weight

Thu Mar 24, 2005 9:31 am

Quoting Trex8 (Thread starter):
So whats with the A350 engines or the pylon (supposedly the same basic engine as the 787s but with bleed air) being heavy. Is it all related to the associated bleed air systems?? Or is there something else I am missing or misunderstood?

The GEnx and T1000 engines are much heavier than the engines currently used by the A330, such as the CF6-80 and T700. In addition to this extra weight, relative to the A330, Airbus needs to beef the pylon, main spar and flaps to accommodate those heavier engines.

Here is an Orders post on this subject that might help.
 
Rj111
Posts: 3007
Joined: Wed Sep 08, 2004 9:02 am

RE: A350 Weight

Thu Mar 24, 2005 9:38 am

I've read somewhere on this site they're looking at the A358 and A359 to weigh 119.2t and 122.3t respectively.

The A332 and A333 weigh 122t and 124t IIRC off the top of my head.
 
trex8
Posts: 4657
Joined: Sat Nov 02, 2002 9:04 am

RE: A350 Weight

Thu Mar 24, 2005 9:54 am

aren't the new engines of similar thrust to the CF6-80E and Trent 700s??? Why are they that much heavier??
 
QFA001
Posts: 651
Joined: Sat May 27, 2000 6:47 am

RE: A350 Weight

Thu Mar 24, 2005 10:45 am

Quoting Trex8 (Reply 3):
aren't the new engines of similar thrust to the CF6-80E and Trent 700s??? Why are they that much heavier??

They have larger, wider chord fans. That also drives the size and weight of the shroud. The off-set, of course, is reduced specific fuel consumption (SFC) and better noise characteristics due to higher bypass-ratio (BPR).

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