Re: An-124 and wing dihedral

Date:         06 Jun 98 15:38:59 
From:         Andrew Cruickshank <andrew@openkast.com>
Organization: OpenKast Limited
References:   1 2 3
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Donald Mc Lean wrote:
> Andrew Cruickshank wrote in message ...
> >With a high wing position on a large 4 engine transport aircraft
> >like a C-5 or An124 the anhedral is used to introduce some
> >instability to counteract the high stability of the underslung
> >mass in the fuselage ...
>
> Are you sure it has anhedral in the air. There is a big weight to support
> and the wings bend as also does the C-141. Sit behind it on the runway on
> take off and watch them bend to what is probably a dihedral position. The
> B747 at max weight on take off also bends up considerably as it gets
> airborne resulting in a considerable change in the chord line and requiring
> a substantial retrim while maintaining V2.

C-141 doesn't have much anhedral and can look almost straight winged
in the air. The anhedral is more obvious on the AN-124 and C-5 and
B-52 - but yes it does appear to be more exaggerated on the ground.

On high wing military combat aircraft such as A-7, Harrier, and
Alpha-Jet the anhedral is more pronounced.

--------------
Andrew.