From: "P. Wezeman" <firstname.lastname@example.org> Organization: The University of Iowa Date: 21 Oct 96 02:29:18 References: 1 2 Followups: 1
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On 12 Oct 1996, Jim Young wrote: > > The really big reason is aerodynamics. A little things called area rule > (look it up in any basic aero book or email me if you want an explanation) > plays a big part in the drag of an airplane. When Boeing originally > streched the 747-200 to the longer upper deck on the -300, the drag of the > airplane actually went down, even though there was more fuselage. Would this mean that if, say, the Boing 757 were to be enlarged to carry more passengers that there would be less drag if instead of extending the fuselage fore and aft with the existing cross section, the fuselage was made double deck in front of the wings and extended single deck aft of the wings so as to maintain weight and aerodynamic balance? In other words, would the drag reduction from improved area ruling make up for the increased cross sectional area? I realize that the complexity of doing this and getting it certified compared to a simple stretch job could easily make it impractical even if there were performance advantages. Also, the ratio of passenger seats to cargo space would be changed, although if cargo space were important, a carrier would probably not be using a B757. Peter Wezeman, anti-social Darwinist "Carpe Cyprinidae"