Thứ Năm, 1 tháng 12, 2011

Boeing 747-8 Exterior

05. 

Boeing named the new airliner the 747-8 because of the technology it will share with that aircraft. Before the official launch of the 747-8, Boeing had plans to develop other variants of existing 747 models under the names 747X (Experimental) and 747-400XQLR (Experimental Quiet Long-Range). These designations were dropped in favor of a "747 Advanced" program, which evolved into the 747-8.
In 2000, Boeing offered the 747X and 747X Stretch derivatives as alternatives to the Airbus A3XX.
This was a more modest proposal than the previous -500X and -600X. It would increase the 747’s wingspan to 229 ft (69.8 m) by adding a segment at the root.
After the 747X program, Boeing continued to study improvements to the 747. The 747-400XQLR (Quiet Long Range) was meant to have an increased range of 7,980 nmi (14,780 km), with better fuel efficiency and reduced noise. Changes studied included raked wingtips similar to those used on the 767-400ER and a sawtooth engine nacelle for noise reduction. Although the 747-400XQLR did not move to production, many of its features were used for the 747 Advanced.
In early 2004, Boeing announced tentative plans for the 747 advanced that were eventually adopted. Similar in nature to the 747-X, the stretched 747 Advanced used technology from the787 to modernize the design and its systems.
The 747-8 is a development of the Boeing 747, which takes advantage of improvements in technology and aerodynamics.

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