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MD-80 Wings  
User currently offlineBruno From United States of America, joined Jan 2000, 853 posts, RR: 3
Posted (13 years 3 months 2 weeks 3 days 1 hour ago) and read 623 times:

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


I support the women’s movement up and down!
5 replies: All unread, jump to last
 
User currently offlineUal747 From , joined Dec 1969, posts, RR:
Reply 1, posted (13 years 3 months 2 weeks 3 days 1 hour ago) and read 547 times:

Are you talking about forward or aft of the wing?

User currently offlineDoug From United States of America, joined Jul 1999, 825 posts, RR: 0
Reply 2, posted (13 years 3 months 2 weeks 3 days 1 hour ago) and read 542 times:

no idea


User currently offlineWingnut From United Kingdom, joined Jun 2005, 0 posts, RR: 0
Reply 3, posted (13 years 3 months 2 weeks 3 days ago) and read 529 times:

They are fairings for the flap actuators and hinges

User currently offlineDash8 From New Zealand, joined Aug 2005, 1 posts, RR: 0
Reply 4, posted (13 years 3 months 2 weeks 3 days ago) and read 522 times:

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.

Sincerely,

Xander Koote

User currently offlineBuff From Australia, joined Mar 2007, 0 posts, RR: 2
Reply 5, posted (13 years 3 months 2 weeks 2 days 21 hours ago) and read 512 times:

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,

Buff
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