The 747ADV is actually more efficient, as the 745 would use the conventional engines from the A380
Actually, no. 745 was designed with an all-new super-efficient wing, that was supposed to signifficantly reduce the fuel burn and make C-market 400+ passenger routes comparable in economy to those of B-market. If Boeing gave the same wing to 745 and apply the composite technology developed for 787 (which at the time of 745 was virtually non-existent at Boeing), then they would have gotten themselves an A380 killer. Unfortunately, it looks like Boeing want to settle for "updated" 35 year old wing...
I like the idea because not only would Boeing have a 450 seat 9,000 nm aircraft, but the -600 would also have a slot in the 500+ seat market. If the damn thing wasn't so expensive to develop, I think it would be put back on the front burner.
Nowhere in my post I mentioned 747-600X
. But anyway, I still think going beyond what Boeing proposes with 747ADV and re-hashing and updating a 1997 design with a XXI-century technology (the 747-500X) might do Boeing better than "just" making 747-400 all-composite. Jeez, I mean with what they know today, they might be able to give this thing nonstop SYD
range and win back Qantas (iirc one of the reasons why they went with A380 was no other alternative for their 744 replacement). Not to mention Malaysia (a VERY upset Boeing customer once they found out 745 is no more), Singapore, Cathay, Korean, JAL, ANA, British Airways, Northwest, Lufthansa, Air France...
Anyway... just my rant for the day... We could have finally gotten a nice-looking 747 (sorry, but I hate the wing on the current one - this comes from the biggest fan of the 777 gull wing) and we have to settle for A380 (yes, the fuselage is UGLY, but just take a good look at THOSE WINGS....)
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