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787 And A350 Engines And Electrical Systems  
User currently offlineMayohoo From United States of America, joined Apr 2012, 30 posts, RR: 0
Posted (2 years 3 weeks 14 hours ago) and read 3788 times:

I noticed this article /n the Boeing Aero magazine. How will the a350 differ in both engine design (RR of ocurse) and electrical architecture?

http://www.boeing.com/commercial/aeromagazine/articles/2012_q3/2/

4 replies: All unread, jump to last
 
User currently offlinetdscanuck From Canada, joined Jan 2006, 12709 posts, RR: 80
Reply 1, posted (2 years 3 weeks 8 hours ago) and read 3790 times:

Quoting Mayohoo (Thread starter):
How will the a350 differ in both engine design (RR of ocurse) and electrical architecture?

The engine architecture will be very similar; the only major difference is that the A350 will have a full bleed system on the engine.

The electrical system, on the other hand, will be quite different. Airbus elected to stick with a pneumatic system on the A350, which relieves the electrical system of considerable load requirements and takes a bunch of motors, power controllers, and power handling out of the system. In return, they have to keep the pneumatic ducts, valves, and overheat/leak detection systems. This also bleeds over to the APU; the A350 APU will need both generators and a load compressor (the 787 APU only has generators).

Tom.


User currently offlineRuscoe From Australia, joined Aug 1999, 1590 posts, RR: 2
Reply 2, posted (2 years 2 weeks 4 days 3 hours ago) and read 3790 times:

I didn't see weight mentioned.

Do we know weight of 787 v 767 engines, with and without nacelles?

Also do we know how 787 engine weights compare with 350 engine weights?

Thanks if anyone knows these figures.

Ruscoe


User currently offlineRuscoe From Australia, joined Aug 1999, 1590 posts, RR: 2
Reply 3, posted (2 years 2 weeks 3 days 23 hours ago) and read 3790 times:

I can partly answer my own question now

Dry weight Trent 1000 12,700 lbs

Dry weight Gen-x 12,800 lbs

Dry weight CF6 9000 lbs

No idea re nacelle weights

Ruscoe


User currently offlinetdscanuck From Canada, joined Jan 2006, 12709 posts, RR: 80
Reply 4, posted (2 years 2 weeks 3 days 21 hours ago) and read 3790 times:

Quoting Ruscoe (Reply 2):
Do we know weight of 787 v 767 engines, with and without nacelles?

787 is much heavier, with or without nacelles, because it's a considerably larger engine and a much larger fan (the fan and case are a disproportional amount of the overall weight).

Quoting Ruscoe (Reply 2):
Also do we know how 787 engine weights compare with 350 engine weights?

A350 is heavier, for the same reasons that the 787 is heavier than the 767. If they go to composite fan case they will recover some, but not all, of that weight.

Tom.


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