Sat, Feb 07, 2009
Aero-Terms!
Aero-Terms are designed to be a daily reminder of the terms,
names, acronyms and explanations of the unique language that
populates the aviation world. Aerospace, sport aviation, fixed
wing, helo, you name it... it's all fair game.
Aero-Terms should serve as a quick but intriguing reminder of
the terms you may use every day, or an introduction to an aspects
of the Aero-World you may not yet be familiar with. ANN also
encourages readers to go beyond the FMI link, and further research
any intriguing terms.
Suggestions for future Aero-Terms are ALWAYS
welcome, as are additions or discussion of the
explanations given for each Aero-Term.
S-Duct
An S-duct is a unique type of jet engine intake duct, used only
on trijets. The S-duct is located in the tail, or empennage, of the
aircraft. As well, the shape of the S-duct is distinctive and
easily recognized. The S-duct was invented as a solution for
positioning the central engine on trijets. The S-duct was easier to
service that alternative trijet designs.[1] Most trijet designs
opted for the S-duct layout. In fact, only the DC-10 and MD-11
trijets chose not to use the S-duct and go with a straight-through
layout. The straight-through layout leaves the engine high above
the ground, making access difficult. The straight layout also
increases total aircraft drag by 2-4%. On the L-1011, engineers
were able to maintain "straight-thru" engine performance by
limiting the curve of the S-duct to less than 25% of the radius of
the engine intake diameter. The S-duct design also reduced the
total empty aircraft weight.
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