【MRJ】三菱リージョナルジェット34【秋に完成-2】 [sc](★0)
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- 819
- 2014/07/06(日) 20:16:50.73
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>>761
の「MRJ の肌はつるつる？」の自己フォロー．
記事自体は素人くさい書き方だけど，B737,B747,B767,B777 とか
外板の段差って結構あるし，エアバス系列(A-330/340)でも同じ．
アルミ合金製の機体ではやむを得ないかと思っていたら，
MRJ はそれらの先例とは違う．
実は結構大事な所かもしれないな．
メリットとしては抵抗減少が考えられるけど，
生産時には(調整の手間が減って)コストダウンになるとか
（ただ設計には手間がかかる）
Mitsubishi Uses Precision To Cut MRJ Costs
http://aviationweek.com/awin/mitsubishi-uses-precision-cut-mrj-costs
"But it turns out that Mitsubishi Aircraft has another card up its
sleeve. The company says the MRJ has been designed to very high levels
of precision, with the aim of easing assembly and thereby cutting
production costs from the very beginning of the manufacturing
program. No cost figures are available, but evidence of high-quality
manufacturing was apparent when Aviation Week last month saw fuselage
major assemblies of the first prototype, built by airframe contractor
Mitsubishi Heavy Industries. Other cost savers will be a moving
assembly line and oven-cured composite parts. "
"From the outset, the program envisaged high costs for design and
early fabrication of detail parts in return for permanent savings in
assembly. The idea is simply to design and build the aircraft with
tighter tolerances than are normal in commercial aircraft so that
parts fit together better, greatly reducing the time taken by
adjustment, such as shimming. The tolerances of detail parts in the
MRJ are typically only half of those normally used in other
manufacturers' programs, says Hiroyuki Tatsuoka, deputy director of
MRJ manufacturing assembly at MHI, declining to give details. "
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