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MD-80 Wings

Wed Feb 09, 2000 10:33 am

What are those protusions on the under side of MD-80 wings for and why don't any other planes have them?
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RE: MD-80 Wings

Wed Feb 09, 2000 10:34 am

Are you talking about forward or aft of the wing?
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RE: MD-80 Wings

Wed Feb 09, 2000 10:36 am

no idea
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RE: MD-80 Wings

Wed Feb 09, 2000 11:31 am

They are fairings for the flap actuators and hinges
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RE: MD-80 Wings

Wed Feb 09, 2000 12:12 pm

I think Bruno is referring to the protrusion under the leading edge mid-length.
thos are called wing fences, and you find the on many "older" wing designs, including the 727. The design is just a little different.
See, wing fences prevent spanwise (root to tip) airflow commonly found on all wings.
Spanwise flow of air causes drag at the tip of the wing. Think of it as a "misplaced" winglet.
I think it also served another function on swept wings, but I can't seem to put my finger on it. Maybe it'll come to me. Meanwhile anyone is free to remind me.


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RE: MD-80 Wings

Wed Feb 09, 2000 2:36 pm

Wing fences, although I couldn't see from the picture provided by Doug, can also serve the same purpose as vortex generators, i.e. boundary layer rejuvenation.

I think what Doug was asking about are the flap track actuator fairings.

It's nice to see some new e-faces on the forum!

Best Regards,