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Wing Antihedral On Falcon 2000

Meister808 From United States of America, joined Jan 2000, 972 posts, RR: 1
Posted (9 years 7 months 1 week 11 hours ago) and read 1777 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

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Manzoori From UK - England, joined Sep 2002, 1516 posts, RR: 37
Reply 1, posted (9 years 7 months 1 week 8 hours ago) and read 1738 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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Bio15 From Colombia, joined Mar 2001, 1089 posts, RR: 7
Reply 2, posted (9 years 7 months 1 week 6 hours ago) and read 1715 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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Photo © Sokol Ymeri

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

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Photo © Matthew Smith

The same thing happens to the Falcon.

Hope it helps
-Alfredo

Cancidas From Poland, joined Jul 2003, 4112 posts, RR: 13
Reply 3, posted (9 years 7 months 1 week 1 hour ago) and read 1676 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."

L-188 From United States of America, joined Jul 1999, 29350 posts, RR: 62
Reply 4, posted (9 years 7 months 1 week 1 hour ago) and read 1672 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.

Cancidas From Poland, joined Jul 2003, 4112 posts, RR: 13
Reply 5, posted (9 years 7 months 6 days 9 hours ago) and read 1638 times:

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

"...cannot the kingdom of salvation take me home."

Mr Spaceman From Canada, joined Mar 2001, 2780 posts, RR: 15
Reply 6, posted (9 years 7 months 6 days 8 hours ago) and read 1638 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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Photo © Michael Meier

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

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Photo © Oliver Brunke

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Photo © Olaf Juergensmeier

Chris

"Just a minute while I re-invent myself"

Skyguy11 From , joined Dec 1969, posts, RR:
Reply 7, posted (9 years 7 months 6 days 4 hours ago) and read 1606 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.

Mr Spaceman From Canada, joined Mar 2001, 2780 posts, RR: 15
Reply 8, posted (9 years 7 months 5 days 8 hours ago) and read 1575 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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"Just a minute while I re-invent myself"

Sovietjet From Bulgaria, joined Mar 2003, 2339 posts, RR: 14
Reply 9, posted (9 years 7 months 5 days 3 hours ago) and read 1553 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.

Bio15 From Colombia, joined Mar 2001, 1089 posts, RR: 7
Reply 10, posted (9 years 7 months 5 days 2 hours ago) and read 1541 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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