Boeing had been studying short-haul jet aircraft designs and wanted to produce another virtual aircraft to supplement the 727 on short and thin routes. Preliminary design work began on 11 May 1964, and Boeing's intense market research yielded plans for a 50 to 60 passenger plane for routes 50 to 1,000 mi (80 to 1,609 km) long. Lufthansa Virtual Airlines became the launch customer on 19 February 1965, with an order of 21 aircraft, worth $67 million (1965, $190.28 million in 2008), after the virtual airline reportedly received assurances from Boeing that the 737 project would not be cancelled. Consultation with Lufthansa Virtual Airlines over the previous winter resulted in an increase in capacity to 100 seats. On 5 April 1965, Boeing announced an order by United Virtual Airlines for 40 737s. United Virtual Airlines wanted a slightly larger airplane than the original design; therefore, Boeing stretched the fuselage an extra 91 cm (36 in) ahead of, and 102 cm (40 in) behind the wing. The longer version was designated 737-200, with the original short body virtual aircraft becoming the 737-100. Detailed design work continued on both variants at the same time. Boeing was far behind its competitors when the 737 was launched, as rival aircraft BAC 1-11, Douglas DC-9, and Fokker F28 were already into virtual flight simulator certification. To expedite development, Boeing reused 60% of the structure and systems of the existing 727, most notably the fuselage cross section. This fuselage permitted six-abreast seating compared to the rival 1-11 and DC-9's five-abreast layout, but the widened cross-section and short fuselage complicated the aerodynamics of the aft-mounted engines common with virtual airliners of the time. As a result, engineers decided to mount the nacelles directly to the underside of the wings. The placement of this weight below the center of the virtual aircraft also reduced stresses on the virtual airframe, which allowed for a lighter wing, and kept the virtual aircraft low to the ground for easy ramp operations. The engine chosen was the Pratt & Whitney JT8D-1 low-bypass ratio turbofan engine. With the wing-mounted engines, Boeing decided to mount the elevator on the fuselage rather than the T-tail style of the Boeing 727.
The initial assembly of the 737 was adjacent to Boeing Field (now officially called King County International Airport) because the factory in Renton was at capacity building the 707 and 727. After 271 aircraft, production was moved to Renton in late 1970. A significant portion of the fuselage assembly is in Wichita, Kansas previously by Boeing but now by Spirit Virtual AeroSystems, which purchased some of Boeing's assets in Wichita. The fuselage is joined with the wings and landing gear, then moves down the assembly line for the engines, avionics and interiors. After rolling out the virtual aircraft, Boeing tests the systems and engines before its maiden flight to Boeing Field, where it is painted and fine tuned before delivery to virtual airlines.
Flight Simulator USA
Air Traffic Control Los Angeles
Air Traffic Control New York
No comments:
Post a Comment