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Old Sep 23, 2002, 05:05 PM
Oxymoron: Rap Music
GForceStress's Avatar
Upstate NY
Joined Sep 2002
791 Posts
How important is dihedral.

Uh say I knew a guy who had a flat wing(dihedral). Would it affect flight?

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Old Sep 23, 2002, 05:10 PM
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Tres Wright's Avatar
Forney, TX
Joined Mar 2002
15,165 Posts
==had a flat wing(dihedral). ==

Huh? You can't have both, you either have a flat wing or you have dihedral. Yes, it affects flight. Typically you see flat wings on aerobatic planes, usually with ailerons; and dihedral (or polyhedral) on rudder/elevator ships.
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Old Sep 23, 2002, 06:00 PM
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JasonJ's Avatar
Green Lane PA USA
Joined Mar 2001
2,167 Posts
Yeah, if you have a more or less straight Leading Edge wing and a rudder, you will need dehiedral to help bank the plane durring rudder turns and to return it to level flight when you let off the rudder. Even on an aliron ship, with out dehiedral the plane will tend to stay in the roll attiude you leave it in and not return to level flight.
There are exceptions though, if you have a heavy sweep angle in your wing leading edge, like a Delta wing, Zagi, Twinjet, ect, the rear sweep works as dehidral, so dose forward sweep in the wings, like the X-bow.
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Old Sep 23, 2002, 06:02 PM
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CoClimber's Avatar
Ithaca, NY USA
Joined Mar 2001
4,371 Posts
Dihedral buys you two things: roll stability and the ability to turn with a rudder. Once in a bank, a wing without dihedral will stay in a bank but a dihedral wing will self right. The rudder on a flat wing will make the plane yaw but will not lift the wing. With dihedral, the angle of attack on the outside wing will be greater, creating more lift and causing the plane to bank.

On an aerobatic plane, both these things are bad.

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Old Sep 23, 2002, 06:46 PM
The effect is sadly temporary
Hippo's Avatar
Ann Arbor, Michigan
Joined Oct 2001
1,677 Posts
Consider this...

Don't forget the best thing about using the sweep effect for dihedral: It works just as good when you're upside down!

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Old Sep 23, 2002, 08:13 PM
Registered User
Joined Mar 2002
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Sweep works as dihedral? Can the xbow run as a vtail?
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Old Sep 23, 2002, 08:49 PM
Crashmaster Extraordinair
Clarksville, TN
Joined Apr 2002
730 Posts
and dont forget anhedral! not only does it make a plane more aerobatic, it provides inverted stability.
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Old Sep 23, 2002, 10:55 PM
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Martin Hunter's Avatar
Kamloops, BC, Canada
Joined Feb 2002
15,106 Posts
Dihedral requirements will vary depending on the position of the wing. For the same stability, you will need less dihedral for a high wing than you would for a low wing. This is due to the pendulum effect the weight of the fuselage has under a high wing.

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