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Wing Antihedral On Falcon 2000  
User currently offlineMeister808 From United States of America, joined Jan 2000, 973 posts, RR: 1
Posted (10 years 9 months 23 hours ago) and read 2386 times:

So, in another thread about the Citation X, the fact that the Dassault Falcon 2000 has strange wings gets raised. It seems that, when on the ground, the wings are slanted down from the roots. I thought that such a configuration was really unstable, so why would they use it on a bizjet?


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-Meister


Twin Cessna 812 Victor, Minneapolis Center, we observe your operation in the immediate vicinity of extreme precipitation
10 replies: All unread, jump to last
 
User currently offlineManzoori From UK - England, joined Sep 2002, 1516 posts, RR: 34
Reply 1, posted (10 years 9 months 21 hours ago) and read 2347 times:

Personally I'd say that the wings are pretty level whilst on the ground.

Don't forget, when in flight the loads on the wing will give it a dihedral form.

Rez
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User currently offlineBio15 From Colombia, joined Mar 2001, 1089 posts, RR: 7
Reply 2, posted (10 years 9 months 19 hours ago) and read 2324 times:

Manzoori is correct, the wings are usually seen bent down because of the fuel weight and their own weight. When in flight, the aircraft is literally lifted by the wings, so they can be seen bended upwards.

A fully loaded 747 shows its wings bent down while in the ground noticeably. This picture of a 747 just prior to t/o shows it a bit:

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And this one of the aircraft just after takeoff shows the upward bending:

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The same thing happens to the Falcon.

Hope it helps
-Alfredo


User currently offlineCancidas From Poland, joined Jul 2003, 4112 posts, RR: 11
Reply 3, posted (10 years 9 months 13 hours ago) and read 2285 times:

the falcon wings are actually designed with negative dihedral (antihedral). i can't remember the reason why though...


"...cannot the kingdom of salvation take me home."
User currently offlineL-188 From United States of America, joined Jul 1999, 29786 posts, RR: 58
Reply 4, posted (10 years 9 months 13 hours ago) and read 2281 times:

All other things being equal you should have more tendency to continue to roll with antihedral, that is why high wing transports use it, since their cargo is carried below the wing (C-5, AN-124) so it acts like a pendulum.







OBAMA-WORST PRESIDENT EVER....Even SKOORB would be better.
User currently offlineCancidas From Poland, joined Jul 2003, 4112 posts, RR: 11
Reply 5, posted (10 years 8 months 4 weeks 1 day 22 hours ago) and read 2247 times:

besides, it makes the plane look unique and sexy. Big grin


"...cannot the kingdom of salvation take me home."
User currently offlineMr Spaceman From Canada, joined Mar 2001, 2787 posts, RR: 9
Reply 6, posted (10 years 8 months 4 weeks 1 day 21 hours ago) and read 2247 times:

Hi guys.

Regarding commercial airliners, the Tupolev-154 is a good example of a low wing jet with antihedral wing angles.

As mentioned above, the Tu-154's wings also bend upwards when they're creating lift, although they don't appear to me to be as flexible as American & European built airliners.

The wing tips are lower than the roots (antihedral).


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The TU-154's wings before creating lift ........


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..... and bending up after creating lift.


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Chris  Smile




"Just a minute while I re-invent myself"
User currently offlineSkyguy11 From , joined Dec 1969, posts, RR:
Reply 7, posted (10 years 8 months 4 weeks 1 day 17 hours ago) and read 2215 times:

Both wing sweep and dihedral have an effect on lateral stability. Highly swept-back wings need less dihedreal to be stable.

You don't want extreme stability because the more stable an airplane is, the more difficult it is to change it's flight path.


User currently offlineMr Spaceman From Canada, joined Mar 2001, 2787 posts, RR: 9
Reply 8, posted (10 years 8 months 4 weeks 21 hours ago) and read 2184 times:

Hello Skyguy11.

You mentioned ...."Highly swept-back wings need less dihedral to be stable."

I believe your statement explains the "extra" dihedral angle on this Yak-40 airliner. It's wings aren't really swept back at all. They're very square looking.

I've never seen jet aircraft wings with so much dihedral angle before.  Wow! They look like they're damaged!

Check out this angle.
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There's not much sweep here.
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Chris  Smile



"Just a minute while I re-invent myself"
User currently offlineSovietjet From Bulgaria, joined Mar 2003, 2550 posts, RR: 17
Reply 9, posted (10 years 8 months 4 weeks 16 hours ago) and read 2162 times:
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Actually the Tu-154 wing is one of the more flexible ones. The wing can be bent so that the tip is 14 meters from its original point before the wing breaks. Of course that doesn't happen in flight. The reason for flexibility is comfort because the flexible wing absorbs turbulence and also contributes to a very light touchdown. I'm guessing that the wing-mounted engines have something to do with the western aircrafts' wings bending more.

User currently offlineBio15 From Colombia, joined Mar 2001, 1089 posts, RR: 7
Reply 10, posted (10 years 8 months 4 weeks 14 hours ago) and read 2150 times:

Actually the Tu-154 wing is one of the more flexible ones. The wing can be bent so that the tip is 14 meters from its original point before the wing breaks.

14 meters seems incorrect to me (an aircraft won't fly with vertical wings  Smile). That's probably close to the length of a single wing! 6, or 7 meters would be quite a lot!

That's just based on impression and common sense, I'm not knowledgeable on the subject, so I may be incorrect.


-Alfredo


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