#md12

[maddrowe12]

md12: Appreciate the mural court. I'm pulling up next week NC.

[sentinelchicken]

This is McDonnell Douglas artwork showing the MD-12X as it appeared in late 1991 during the design phase. While it looks much like the MD-11, it's clear that it's longer, the engines are larger and the note the wings are bigger with canoe-shaped flap actuator/track fairings instead of the characteristic external flap hinge fins used on the MD-11. ⁣ ⁣ On 25 October 1991, the McDonnell Douglas board of directors gave formal approval to start offering the MD-12X to prospective airline customers. ⁣ ⁣ Canted winglets based on those used on the MD-11 would appear on again, off again during this time period. Official renderings did not have them as it was felt the wingspan increase and larger wing would make them unnecessary by late 1991, but wind tunnel models from earlier in the year show winglets present. ⁣ ⁣ It was becoming rapidly apparent to McDonnell Douglas through 1991 that the MD-12X would not meet its range and payload targets using the same engines and wing as the MD-11. With a larger wing and engines came the opportunity for capacity increases- but further stretches of the fuselage would have left the MD-12X design longer than what would have been compatible than existing airport gate infrastructure which was sized around an aircraft the size of the 747-400. ⁣ ⁣ By the spring of 1992, the MD-12X would morph into a four engine double deck airliner marketed as the MD-12. ⁣ ⁣ #McDonnellDouglas #MD12 #MD12X #MD11 #Boeing⁣ ⁣ #instagramaviation #splendid_transport #instaaviation #aviationlovers #aviationphotography #flight ⁣ ⁣ #AvGeeksAero #AvgeekSchoolofKnowledge #AvGeekNation https://www.instagram.com/sentinelchicken/p/CYDaod6rT4O/?utm_medium=tumblr

[sentinelchicken]

When the MD-12 program was first launched in 1990 as the MD-12X, it started out as an enhanced development of the MD-11. As the design was further refined through 1991, McDonnell Douglas had been focusing on a long-range trijet that was 35-39 feet longer than the MD-11 with a bigger wing and empennage. ⁣ ⁣ There were at least two iterations of main landing gear on the trijet version of the MD-12X, one with four wheel bogies with two under the fuselage and two under the wings not unlike the Boeing 747. Another iteration had six wheel main bogies under the wings and a four wheel centerline bogie- this version would have likely been used had the MD-12X proceeded as a trijet. ⁣ ⁣ Three engines were studies for the MD-12X trijet- the General Electric GE90 with a smaller fan than what is used on the Boeing 777, the Pratt & Whitney PW4484 derived from the PW4084 used on the 777, and finally the Rolls-Royce Trent 775, a slightly enlarged version of the Trent 700 used on the Airbus A330. ⁣ ⁣ The MD-12X trijet was designed for LAX-HKG, DFW-NRT, or SIN-CDG routes with approximately 377 passengers in a three class configuration. ⁣ ⁣ The first problem was that the MD-12X as a trijet would not have fit into the "box" at the gate that the Boeing 747-400 fits into. The second issue was the weight of the tail structure to accommodate the number 2 engine as big as the proposed engines. ⁣ ⁣ In 1992, McDonnell Douglas did a complete redesign of the MD-12 into an all new double deck four engine aircraft to address the growing issues with the trijet version of the design. "MD-12X" usually refers to the first design iteration as a trijet and "MD-12" refers to the double deck four engine second design iteration. ⁣ ⁣ #McDonnellDouglas #MD12 #MD12X #MD11 #Boeing⁣ ⁣ #instagramaviation #splendid_transport #instaaviation #aviationlovers #aviationphotography #flight ⁣ ⁣ #AvGeeksAero #AvgeekSchoolofKnowledge #AvGeekNation https://www.instagram.com/sentinelchicken/p/CX67NgClBqo/?utm_medium=tumblr

[sentinelchicken]

By late 1991, it was clear that the MD-12 as a trijet evolution of the MD-11 was a dead-end as it would have been too long for airport compatibility and too heavy to meet its range/payload targets. ⁣ ⁣ In the spring of 1992, McDonnell Douglas changed course and the MD-12 morphed into a four-engined double deck design that was only 3 feet longer than the MD-11 with a wingspan only 2 feet wider than the Boeing 747-400. The planned engines would be similar to what was already in use on the MD-11 and the 747-400, which offered less risk to prospective customers, particularly if they were already MD-11 or 747 operators. ⁣ ⁣ As a larger capacity aircraft with up to 27 first class, 95 business class and 377 coach class seats, the seat-mile costs for the MD-12 redesign were much better than the trijet design and it offered growth potential for possible fuselage stretches. Compared to the typical 870,000 lb weight of the Boeing 747-400, this design iteration of the MD-12 came in at 932,000 lbs with a design range of 7300 nm at maximum takeoff weight. ⁣ ⁣ McDD was also considering a long range version of the MD-12 with a partial upper deck which might have looked a bit like the 747 as well as an all-cargo and combi versions of the MD-12. The combi version would have had passengers on the upper deck with cargo on the main deck and lower deck. The proposed MD-12F would have taken LD9s on the top deck, a dual row of M1 containers on the main deck (similar to the 747-400F) and either LD9s on the lower deck or two rows of LD3s. ⁣ ⁣ The new MD-12 was departure for McDD which had been focusing on incremental evolution of its DC-10 and DC-9 product lines, resulting in the MD-11 and the MD-80. Had it gone forward, it would have been their first all-new design in 20 years since the launch of the DC-10. ⁣ ⁣ (AWST, 13 April 1992)⁣ ⁣ #McDonnellDouglas #MD12 #Boeing⁣ #instagramaviation #splendid_transport #instaaviation #aviationlovers #aviationphotography #flight ⁣ #AvGeeksAero #AvgeekSchoolofKnowledge #AvGeekNation https://www.instagram.com/p/CYb2r0_lTWf/?utm_medium=tumblr

[miguel-garcia-rd]

The MD-11 LR – The Long Range A380 Alternative That Never Was

bySumit Singh

December 19, 2020

The Airbus A380 had several potential competitors in the years leading up its launch. Towards the end of the 20th century, there was a craze to see who could produce the next jumbo. As a result, McDonnell Douglas was planning a stretched version of the MD-11 that could have gone up against the Europeanbehemoth. Let’s take a look at the proposals.

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MD-12

Initial plans:

The MD-12 was first conceived as a trijet larger than the MD-11, then stretched to a quadjet aircraft. According to AV Geekery, McDonnell Douglas surprisingly revealed the MD-12 project in 1992. The plane would have had a similar appearance to the A380, but with a more streamlined body.

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Here is a look at how the two jumbos compare when it comes to key specifications:

MD-12:

Cockpit crew: 2

Passengers: 430 Passengers (3 class) /511 (1 class).

Engines: 4x General Electric

Range: 7,170 NM / 14,825 km

Maximum speed: Mach 0.85

Length: 208 ft 0 in (63.40 m)

Wingspan: 213 ft 0 in (64.92 m)

Height: 74 ft 0 in (22.55 m)

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A380:

Cockpit crew: 2

Passengers: 400-550 (4 class)

Engines: 4x Rolls-Royce Trent 900 or Engine Alliance (General Electric-Pratt & Whitney) GP-7200 turbofans.

Range: 8,000 NM / 14,800 km

Maximum speed: 0.89 Mach

Length: 238 ft 6 in (72.7 m)

Wingspan: 261 ft 10 in (79.8 m)

Height: 79 ft (24.1 m)

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A change of heart:

Altogether, even though some factors are close calls, the A380 edges the MD-12 in every key aspect. Had the MD-12 been introduced, Airbus would have bragging rights with its specifications.

Nonetheless, the MD-12 would not come to fruition. Remnants of the type went on to exist across the aviation industry. For instance, Boeing has been placing traces of the plane’s design into the wing of its other projects. Moreover, the aircraft’s proposed General Electric’s CF6-80C2 engines later supported variants of the 747, 767, and A330.

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Several potential competitors:

After the failure to introduce the MD-12 McDonnell Douglas went on to work on 300 to 400–seat MD-11 variants. In 1996, the manufacturer shared plans for a new trijet at the Farnborough International Air Show. The plane was at the time named the MD-XX and it was offered in two models. These were the MD-XX Stretch with a longer fuselage and MD-XX LR with a longer range.

Both designs had a 213 ft (64.9 m) wingspan, which was the same as the MD-12. However, the MD-XX Stretch design was lengthened 32 ft (9.8 m) over the MD-11. Moreover, the plane would have had a capacity for 375 passengers in a typical 3-class configuration and 515 travelers in an all-economy setup. The range for this stretched unit was planned to be 7,020 NM / 13,000 km.

Meanwhile, the LR was designed to host 309 passengers n a typical 3-class configuration, It would have also had a range of 8,320 NM / 15,400 km. However, the board of directors at McDonnell Douglas chose to end the whole program later that year.

McDonnell Douglas would soon get scooped up by Boeing amid a $13 billion stock swap in the middle of 1997. Notably, many of the carriers interested in the MD-12 went on to acquire the A380 instead.

There were some rumors that McDonnell Douglas did not actually intend to build the proposed jumbo. Some felt that the program was just a method from the firm to get Boeing to purchase it for a greater fee.

[mpessina]

#Nikon FE de 1978 + motor MD-12 de 1980. #nikonfe #nikonfemd12 #md12 (en Argentina)

[sv-werder-8]

Das ist zum Kotzen.

Fin Bartels

[silverph]

#Nikon MD-12 Motor Drive works! I was able to fix it after opening it up and using DeoxIT to clean the contacts. Sweet! #md12 #cameraporn