Boeing 737-800 Wallpapers

Boeing 737-800 Aircraft - photo wallpapers: The Boeing 737 is the world's most popular medium range, narrow body airliner. With over 6,000 ordered and over 5,000 delivered, it is the most ordered and produced commercial passenger jet of all time and has been continuously manufactured by Boeing since 1967. The 737 is now so widely used that at any given time, there are over 1,250 airborne worldwide. On average, one takes off or lands every five seconds. The 737 was born out of Boeing's need to introduce a competitor in the short-range, small capacity jetliner market which had been pioneered by the Sud Aviation Caravelle, BAC 1-11 and the Douglas DC-9. While Boeing had originally planned for a 60 to 85 seat airplane, consultation with launch customer Lufthansa resulted in a change to 100 seats. Boeing was far behind its competitors when the 737 was launched, as rival aircraft were already into flight certification. To speed up the development time, Boeing reused 60 percent of the structure and systems of the existing 727, most notably the fuselage cross section, which permitted six-abreast seating compared to the rival 1-11 and DC-9's five-abreast layout. The same basic fuselage cross section was also used on the 707, and later on the 757. Significantly, the widened cross-section and short fuselage complicated the aerodynamics of the planned aft-mounted engines. As a result, engineers mounted the engines on pylons directly to the underside of the wings; which kept the aircraft low to the ground for easy ramp operations. This would become an issue later on in the 737s life, when high-bypass turbofans were fitted to the design. [br]Description: Engines on the 737 Classic series (300,400,500) and Next-Generation series (600, 700, 800, 900) appear not to have circular inlets, as most aircraft do. Engineers needed additional space to locate equipment on the more powerful engines, but because the 737 sits lower to the ground than most airplanes, the enlarged engine would sit too close to the ground. Instead, the engineers placed equipment on the engine's sides, giving the engine a somewhat triangular rounded shape. Boeing and CFM International, the engine manufacturer, claim that the shape actually yields slightly improved performance. The necessary nacelle redesign is known in the industry as "hamsterisation", because of the resemblance of the shape to the rodent. Because the engine is so close to the ground, 737-300s and later are more prone to engine foreign-object damage (FOD). 737s are not equipped with fuel dump systems. Depending upon the nature of the emergency, 737s either circle to burn-off fuel or land overweight. Also, the 737 has no full doors covering the main landing gear. The main landing gear (under the wings at mid-cabin), rotate into wells in the plane's belly, the legs being covered by partial doors, and "brush-like" seals aerodynamically smooth (or "fair") the wheels in the wells. The sides of the tires are exposed to the air in flight. "Hub caps" complete the aerodynamic profile of the wheels. It is forbidden to operate without the caps, because they are links to the ground speed sensor that interfaces with the anti-skid brake system. When observing a 737 take off, or at low altitude, the dark circles of the tires can be plainly seen. Boeing states that this design saves weight and reduces complexity. Most 737 cockpits are equipped with "eyebrow windows" positioned above the main glareshield. Eyebrow windows were a feature of the original 707. They allowed for greater visibility in turns, and offered better sky views if navigating by stars. With modern avionics, they became redundant, and many pilots actually placed newspapers or other objects in them to block out sun glare. They were eliminated from the 737 cockpit design in 2004, although they are still installed in military variants and at customer request. Blended winglets are available as retrofits and in production on newer 737 aircraft. These winglets stand approximately 8 feet tall and are installed at the wing tips. They help with reduced fuel burn (by reducing vortex drag), reduced engine wear, and less noise on takeoff.[br]Boeing 737-800: The 737-800 was a stretched version of the 737-700, and replaces the 737-400. It also filled the gap left by Boeing's discontinuation of the McDonnell Douglas MD-80 and MD-90 after Boeing's merger with McDonnell Douglas. The -800 was launched by Hapag-Lloyd Flug (now TUIfly) in 1994 and entered service in 1998. The 737-800 seats 162 passengers in a two class layout, or 189 in one class, and competes with the A320. An executive conversion is offered as the BBJ2, and the 737-800ERX ("Extended Range") is available as a military variant. For many airlines in the U.S., the 737-800 replaced aging Boeing 727-200 trijets.[br][br]

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Boeing 737-800 Wallpapers @ Mega Wallpapers (08 Edition)
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