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Aircraft Wiki
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====747-500X, -600X and -700X==== Boeing announced the 747-500X and -600X at the 1996 Farnborough Airshow.<ref name="boe_1996" /> The proposed models would have combined the 747's fuselage with a new 251 ft (77 m) span wing derived from the [[Boeing 777|777]]. Other changes included adding more powerful engines and increasing the number of tires from two to four on the nose landing gear and from 16 to 20 on the main landing gear.<ref name="faa_nla">Patterson, James W. [http://www.tc.faa.gov/its/worldpac/techrpt/ar97-26.pdf "Impact of New Large Aircraft on Airport Design" (PDF)], [[Federal Aviation Administration]], March 1998. Retrieved: 17 December 2007.</ref> [[File:BI44778.jpg|thumb|331x331px|Rendering Concepts of the Boeing 747-500X and -600X flying together with the Boeing 747-400.]] The 747-500X concept featured an 18 ft (5.5 m) stretch to 250 ft (76.2 m) long, and the aircraft was to carry 462 passengers over a range up to 8,700 nautical miles (10,000 mi, 16,100 km), with a gross weight of over 1.0 Mlb (450 Mg).<ref name="faa_nla" /> The 747-600X concept featured a greater stretch to 279 ft (85 m) with seating for 548 passengers, a range of up to 7,700 nmi (8,900 mi, 14,300 km), and a gross weight of 1.2 Mlb (540 Mg).<ref name="faa_nla" /> A third study concept, the 747-700X, would have combined the wing of the 747-600X with a widened fuselage, allowing it to carry 650 passengers over the same range as a 747-400.<ref name="boe_1996" /> The cost of the changes from previous 747 models, in particular the new wing for the 747-500X and -600X, was estimated to be more than $5 billion.<ref name="boe_1996" /> Boeing was not able to attract enough interest to launch the aircraft.<ref name="FI_500X" />
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