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View Diary: How Airliners Work - Weight and Balance (160 comments)

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  •  Torque on the wing (9+ / 0-)

    Long, thin wings, especially swept wings, tend to twist under load.  My impression is that those engine pylons are intended to let the engines pull the wing rather than twist it.  

    So why to they put the engines under the wing instead of embedding it inside?  Two reasons--the less crap on the wing, the more efficient it is, and those embedded engines were a fire hazard, because most modern aircraft have "wet" wings--fuel tanks inside the wing.  

    The KC-135's I flew, and presumably most other modern jets, use spoilers for roll control because it reduces the twisting forces on the wing.  Rather than making one wing rise and the other drop, like ailerons, the spoilers make one wing have more drag and less lift, causing the same result with less structural stress.  

    How many wrongs does it take to make a right?

    by pdknz on Tue May 07, 2013 at 06:08:24 PM PDT

    [ Parent ]

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