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DC10 & L-1011: Wing And Flap Question  
User currently offlineDC10Tony From United States of America, joined May 2001, 1012 posts, RR: 0
Posted (12 years 10 months 3 weeks 4 days 2 hours ago) and read 3695 times:

On the DC-10, why are the wings almost perfectly straight, while on the L-1011 they're curving upward?

On the DC-10, why are the rear horizontal stabilizers curved upward, but on the L-1011, they're perfectly straight?

Are there any advantages or disadvantages for each design, or one plane compared to the other?

5 replies: All unread, jump to last
 
User currently offlineTEDSKI From , joined Dec 1969, posts, RR:
Reply 1, posted (12 years 10 months 3 weeks 3 days 17 hours ago) and read 3636 times:

The L-1011 has a slat locking system that the DC-10 lacks.

User currently offlineDC10Tony From United States of America, joined May 2001, 1012 posts, RR: 0
Reply 2, posted (12 years 10 months 3 weeks 3 days 15 hours ago) and read 3620 times:

Ok, but what's a slat locking system and how is it relevant to my question?

User currently offlineDC-10Tech From United States of America, joined Jun 2001, 298 posts, RR: 2
Reply 3, posted (12 years 10 months 3 weeks 3 days 14 hours ago) and read 3617 times:

The upward curving you're speaking of is call 'Dihedral'. While the DC-10 wing appears to be straight, it is actually called a dual dihedral because the wing roots actually curve up quite a bit until they meet the less-curved part of the wing near the pylons. Dihedral increases stability about the roll axis. The difference between the dihedral on the stabs of each aircraft may be due to the different configurations between the #2 engine arrangement. Just remember that the engineers designed these aircraft after a lot of wind tunnel testing, and the design of each aircraft has been found to be the best combination of aerodynamics, handling, and efficiency in the wind tunnel.




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User currently offlineBuzz From United States of America, joined Nov 1999, 697 posts, RR: 21
Reply 4, posted (12 years 10 months 3 weeks 3 days 1 hour ago) and read 3595 times:

Hi Dc10tony and Tedski, Buzz here. I'll have to disagree with Tedski, since that AA DC-10 roll-over-and-die at ORD, the DC-10 have had a lock installed on the leading edge slat drive wheel and cable. Yes, there is a big wheel that pulls cables, thumped my head on it a few times. And i like Lockheed aircraft, we only had 6 of the L1011-500's to compare with the almost 60 DC-10's we were flying.

I'm not an expert at aerodynamics, but one thought: There's a mighty downwash of air coming off the wing, sometimes the horizontal tail has a lot of dihedral to get some of it out of the downwash as you get to higher angles of attack.

g'day
Buzz Fuselsausage: Line Mechanic by night, DC-3 Crew Chief by choice


User currently offlineMirrodie From United States of America, joined Apr 2000, 7443 posts, RR: 62
Reply 5, posted (12 years 10 months 3 weeks 3 days ago) and read 3587 times:
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Can anyone show a vid or link showing Flap ops on the 1011??


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