Tue . 18 Sep 2018

McDonnell Douglas MD-12

mcdonnell douglas md-12, mcdonald douglas md-12
The McDonnell Douglas MD-12 was an aircraft design study undertaken by the McDonnell Douglas company in the 1990s for a "superjumbo" aircraft, first conceived as a larger trijet, then stretched to a 4-engine airliner It was to be similar in size to the Boeing 747, but with greater passenger capacity However, the MD-12 received no orders and was canceled McDonnell Douglas then studied larger MD-11 derivatives named MD-XX without proceeding

Contents

  • 1 Design and development
    • 11 Background
    • 12 MD-12
    • 13 MD-XX
  • 2 Variants
  • 3 Specifications MD-12 High Capacity design
  • 4 See also
  • 5 References
  • 6 External links

Design and developmentedit

Backgroundedit

McDonnell Douglas studied improved, stretched versions of the trijet MD-11, named MD-12X1 with a possible lower-front passenger deck with panoramic windows23 The MDC board of directors agreed in October 1991 to offer the MD-12X design to airlines MD-12X had a length of 237 ft 11 in 725 m and wingspan of 212 ft 6 in 648 m In November 1991, McDonnell Douglas and Taiwan Aerospace Corporation signed a Memorandum of Understanding to form a company to produce the new design The new company would have McDonnell Douglas as the majority shareholder 51% with Taiwan Aerospace 40% and other Asian companies 9% having the remaining shares3

MD-12edit

Artist's impression of the aircraft

In late 1991, McDonnell Douglas made a move to separate its civil and military divisions in a bid to raise the estimated $4 billion development costs needed to develop the MD-12X trijet Separating the costly military C-17 airlifter development, which had been a drain on the company's resources, from the profit-making production of the MD-80 and MD-11 airliners would make it easier to attract foreign investors for the MD-12X4

The design grew into the much larger MD-12 with four engines and two passenger decks extending the length of the fuselage The length of the main MD-12 variants was 208 ft 634 m with a wingspan of 213 ft 649 m The fuselage was 24 ft 3 in 739 m wide by 27 ft 11 in 851 m high3

McDonnell Douglas unveiled its MD-12 design in April 19923 The design was similar in concept to the Airbus A3XX and Boeing NLA, and it would have been larger than the Boeing 747 with which it would have directly competed Douglas Aircraft had also studied a smaller double-decker design in the 1960s56

The first flight of the MD-12 was to take place in late 1995, with delivery in 19973 Despite aggressive marketing and initial excitement, especially in the aviation press, no orders were placed for the aircraft MDC lacked the resources after Taiwan Aerospace left the project3 Some sceptics believed MDC launched the project to lure Boeing into paying a higher price for the company78better source needed A new double deck widebody has proved to be extremely expensive and complex to develop, even for the remaining aerospace giants Boeing and Airbus, although the massive Airbus A380, a similar concept to the MD-12, was later brought to fruition910

MD-XXedit

With the MD-12 program over, McDonnell Douglas focused on 300 to 400–seat MD-11 derivatives At the 1996 Farnborough International Air Show, the company presented plans for a new trijet with high-seating and long-range named "MD-XX"11 The MD-XX was offered in two variants; MD-XX Stretch with a longer fuselage and MD-XX LR for longer range Both MD-XX variant designs had 213 ft 649 m wingspan, the same as MD-12 The MD-XX Stretch was lengthened 32 ft 98 m over the MD-11 and had seating for 375 in a typical 3-class arrangement and 515 in all-economy seating Its range was to be 7,020 nmi 8,080 mi; 13,000 km The MD-XX LR was the same length as the MD-11, had seating for 309 in a typical 3-class arrangement and featured a range of 8,320 nmi 9,570 mi; 15,400 km However, the MDC board of directors decided to end the MD-XX program in October 1996, stating the financial investment for the program was too large for the company3

Variantsedit

The MD-12 was offered in a few proposed variants listed below3

  • MD-12 HC High Capacity
  • MD-12 LR Long Range
  • MD-12 ST Stretch
  • MD-12 Twin two engine version

Specifications MD-12 High Capacity designedit

Data from McDonnell Douglas promotional materials1

General characteristics

  • Crew: 2 pilot and co-pilot
  • Capacity: Long range: 430 passengers 3-class / High-capacity: 511 passengers 3-class
  • Length: 208 ft 0 in 6340 m
  • Wingspan: 213 ft 0 in 6492 m
  • Height: 74 ft 0 in 2255 m
  • Wing area: 5,846 ft² 5431 m²
  • Empty weight: 402,700 lb 187,650 kg
  • Max takeoff weight: 949,000 lb 430,500 kg
  • Powerplant: 4 × General Electric CF6-80C2 high-bypass turbofans, 61,500 lbf 274 kN each

Performance

  • Maximum speed: Mach 085 565 knots, 1,050 km/h
  • Range: 7,170 nmi 9,200 mi, 14,825 km
  • Wing loading: 1623 lb/ft² 7927 kg/m²

See alsoedit

Related development
  • McDonnell Douglas MD-11
Aircraft of comparable role, configuration and era
  • Airbus A380
  • Boeing NLA
  • Boeing 747X
  • Sukhoi KR-860

Referencesedit

Notes
  1. ^ a b "MDC brochures for undeveloped versions of the MD-11 and MD-12" md-elevennet Retrieved: April 14, 2008
  2. ^ "MD-11 page" Airlinersnet Retrieved: October 18, 2007
  3. ^ a b c d e f g h Steffen, Arthur 2002, McDonnell Douglas MD-11: A Long Beach Swansong, UK: Midland: Hinckley, pp 92–94, ISBN 1-85780-117-2 
  4. ^ "MD-12 divides Douglas" Flight International, November 13–19, 1991
  5. ^ Berek, D "Proposed double deck DC-10 design in 1965" webshotscom, April 4, 2004 Retrieved: July 15, 2011
  6. ^ Waddington, Terry McDonnell Douglas DC-10 Miami, Florida: World Transport Press, 2000 ISBN 1-892437-04-X
  7. ^ Knowlton, Brian; International Herald Tribune "Boeing to Buy McDonnell Douglas" New York Times Arthur Ochs Sulzberger, Jr Retrieved 23 March 2017 
  8. ^ Bean, Bransom "FAILURE TO LAUNCH: THE LEGACY OF THE MCDONNELL DOUGLAS MD-12 PROGRAM" AV Geekery AV Geekery Retrieved 23 March 2017 
  9. ^ "Airbus will lose €48bn because of A380 delays" Times Online, October 4, 2006
  10. ^ Schwartz, Nelson D March 5, 2007, "Big plane, big problems", CNN 
  11. ^ "McDonnell Douglas Unveils New MD-XX Trijet Design" Archived 2011-11-06 at the Wayback Machine McDonnell Douglas, September 4, 1996

External linksedit

  • Undeveloped MD-11/MD-12 models page on MD-Elevennet
  • "McDonnell May Build A Larger Jet", The New York Times, March 16, 1992

mcdonald douglas md-12, mcdonnell douglas md 12 aircraft, mcdonnell douglas md-12


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McDonnell Douglas MD-12


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