User:Fnlayson/Boeing 7X7

From Wikipedia, the free encyclopedia

Contents

[edit] Boeing 767

Main article: Boeing 767

[edit] Development

The Boeing 767 was first offered for sale in July 1978 with an order for 30 airliners by United Airlines. It was developed at the same time as the 757, its narrowbody sister.[1] Prior to its public offering, it was referred to as the 7X7.[2] With the 707 aging, Boeing decided to offer a mid-size wide-body aircraft to fit in between the 727/737/757 and the 747. The 767 has a fuselage width of 15 ft 6 in (472.44 cm) that is midway between the two other aircraft. The first 767, a -200 was rolled out 4 August 1981 and first flew a on 26 September 1981.[1]

The 767 was designed using engines used on the 747 with wings sized to match. The wings were larger and provided longer range than the initial customers wanted. However, the larger wings only increased fuel usage slightly and provided better takeoff and landing performance. Boeing designed the 767 with enough range to fly across North America and across the north Atlantic.[3]

TEXT -200

Launched in July 1978, the 767 was developed in tandem with the narrowbody 757 with which it shares a common two crew EFIS flightdeck (with six colour CRT displays) and many systems. The 767 also features a unique width fuselage typically seating seven abreast in economy, and a new wing design with greater sweepback (compared to the 757) which was designed with high altitude cruise in mind.

Initially Boeing intended to offer two versions, the longer 767-200 and short fuselage 767100 (which was not launched as it was too close in capacity to the 757). The 767 first flew on September 26 1981, and entered service (with United) on September 26 1982 (certification with P&W engines was awarded on July 30 1982).

The longer range 767-200ER (Extended Range) version features higher weights and an additional wing centre section fuel tank. It first flew on March 6 1984, and service entry, with Ethiopian Airlines, was two months later. The 200ER accounts for 111 of the total 239 767-200s ordered.

TEXT -300

Boeing announced that it was developing a stretched development of the 767-200 in February 1982.

The resulting 767-300 features a 6.42m (21ft 1in) stretch consisting of fuselage plugs forward (3.07m/10ft 1in) and behind (3.35m/11ft) the wing centre section. The flightdeck and systems were carried directly over from the 767-200, the only other changes were minor, and related to the increased weights of the new version. Initially the max takeoff weight was the same as the later 767-200ER.

The 767-300 flew for the first time on January 30 1986, and was awarded certification and entered service in September that year. The higher weight Extended Range ER version flew on December 19 1986, while RollsRoyce RB-211-524G engines became available from 1989. The range of the 767-300ER has proven to be very popular with a number of airlines using them for long range low density flights.

In 1993 Boeing launched the 767-300F General Market Freighter. Changes include strengthened undercarriage and wing structure, a cargo handling system, no cabin windows and a main deck freight door. Capacity is 24 containers.

TEXT -400

Boeing's 767-400ER is a stretched development of the popular 767-300ER, designed to replace early A300, A310 and 767 twins used on transcontinental services and DC-10-30s and L-1011 trijets used for intercontinental work. It competes with the A330-200.

Design work on the then 767-400ERX began in late 1996 when Boeing signed a technical assistance agreement covering the program with the then independent Douglas Aircraft Company division of McDonnell Douglas. At the time Boeing suffered from a shortage of engineering talent with a number of other key programs underway while Douglas had surplus engineering capacity following the cancellation of the MD-XX (Boeing and McDonnell Douglas subsequently merged in August 1997). The program was formally launched as the 767-400ER in January 1997 when Delta Airlines ordered 21.

The most significant change with the 767-300 is the 6.4m (21ft) fuselage stretch, which increases typical three class seating capacity from 218 to 245. Because of the increased fuselage length the -400 features all new, 46cm (18in) taller landing gear to restore rotation angles for acceptable takeoff and landing speeds and distances which would otherwise have been adversely affected by the fuselage stretch. The wheels, tyres and brakes are common with the 777.

Compared to the 767-300, the 767-400ER's wing features 2.34m (7ft 8in) long raked wingtips which improve aerodynamic efficiency. Winglets were originally considered but the wingtip extensions proved more efficient. The wing is also made from increased gauge aluminium with thicker spars.

Inside, the 767-400ER features a 777 style advanced flightdeck with six colour multifunction displays, which can present information in the same format as earlier 767s, allowing a common type certificate, or as for the 777 and Next Generation 737s. The all new passenger interior is similar to that in the 777.

Other features include common engines with the 767-300, a new APU, new tailskid and increased weights.

The first flight was made 9 October 1999. Four aircraft took part in the development program.

Delta Airlines was the launch customer, and, as of December 2001, the aircraft was also ordered by Continental Airlines and Kenya Airways.

[edit] Design

The 767 is a mid-size, wide-body twinjet airliner. The 767 can carry between 181 and 245 passengers in a standard three-class configuration and has a range of 5,200 to 6,590 nautical miles (9,400 to 12,200 km) depending on variant.

The 767 offers a twin aisle configuration of 2+3+2 in economy with the most common business configuration of 2+2+2. It is possible in some charter configurations to squeeze an extra seat for a 2+4+2 configuration, however the seats are very narrow and this is not common. The 767 has a seat-to-aisle ratio in economy class of an efficient 3.5 seats per aisle, making for quicker food service and quicker exit of the plane than many other jetliners, which typically have between four and six seats per aisle in economy class.

In addition to the Boeing Signature Interior retrofit option, a simpler mod known as the "Boeing 767 Enhanced Interior" is available. This retrofit borrows styling elements from the Boeing Signature Interior; however, the outer section overhead bins are traditional-style shelf bins rather than the 777-style pivot bins.

[edit] References

  1. ^ a b Shaw, Robbie. Boeing 757 & 767, Medium Twins. Osprey Publishing, 1999, ISBN 1-85532-903-4.
  2. ^ "Boeing Gives the 7E7 Dreamliner a Model Designation", Boeing, January 28, 2005.
  3. ^ Sutter 2006, p. 241-246.
  • Sutter, Joe. 747: Creating the World's First Jumbo Jet and Other Adventures from a Life in Aviation. Washington, DC: Smithsonian Books, 2006, ISBN 0-06-088241-9.

[edit] External links

[edit] Boeing 717

Main article: Boeing 717

[edit] Design

Article needs some airframe design info.

[edit] Boeing 747

Main article: Boeing 747

[edit] Undeveloped variant links

747X/X Stretch

[1] [2] [3] [4] [5]

747-400XQLR

[6] [7] [8]