keesje
Posts: 8591
Joined: Thu Apr 12, 2001 2:08 am

Boeing 747 Advanced Design Complications..

Tue Aug 12, 2003 11:17 pm


Observers question whether the 747 orderbook is large enough to sustain production until flight tests and deliveries of the Advanced could start in 2007-9. The 747-400 order backlog stands at 43. This is steadily diminishing, with around three years of work remaining at current build rates.

It is unclear if those carriers that have yet to decide on a future large capacity aircraft will wait until 2009. The rival Airbus A380 is due to enter service in 2006 and competitive pressure will possibly force undecided carriers such as British Airways and Cathay Pacific Airways to make a decision sooner.

Questions hang over the proposed use of 7E7 engines for the Advanced. Boeing has opted for a no-bleed-air concept for the 7E7 in a move towards a more- electric aircraft. The 747, however, requires bleed air for a range of functions, including start-up, environmental control, hydraulics and anti-icing.
Industry sources suggest it will be difficult to use the same combination of core and fan while bleeding air.

Ground clearance issues on the 747 limit engine fan diameter to just over 2.6m (100in), but engine manufacturers are looking at 2.8-2.9m fans for the 7E7.

Source: Flight International


Seems would have to be fast and modify the 747 substantially ... difficult trade-off ...
"Never mistake motion for action." Ernest Hemingway
 
cedarjet
Posts: 8101
Joined: Mon May 24, 1999 1:12 am

RE: Boeing 747 Advanced Design Complications..

Tue Aug 12, 2003 11:50 pm

I really don't think this is going to happen for Boeing. Cathay and BA are both big Airbus customers and I don't think they'll have a problem operating the big new bird from Toulouse, which the baseline machine of a design which will be in production for 20 years, as opposed to the final few 747s, whose value will plummet dramatically.

Sorry.
fly Saha Air 707s daily from Tehran's downtown Mehrabad to Mashhad, Kish Island and Ahwaz

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