Re: An-124 and wing dihedral

Date:         18 May 98 16:03:00 
From:         psagdeo@aol.com (Psagdeo)
Organization: AOL http://www.aol.com
References:   1
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The dihedral required is a function of wing location.  All low-wing
aircraft have positive dihedral, or wing tips above the wing root when
seen in the front view.  Dihedral is required for lateral stability in
sideslip.  All mid-wing aircraft have practically no dihedral.  Most
high-wing aircraft have no dihedral.  However, some large high wing
transports such as the AN124, C-5 Galaxy and others have negative
dihedral called anhedral.  This is actually to counteract the excessive
stability in sideslip even with a zero dihedral!  For more details,
please refer to "Aircraft Design: A Conceptual Approach" by Daniel
Raymer.

Hope this helps.

Pradip Sagdeo