Date: 06 Jun 98 15:38:59 From: Andrew Cruickshank <email@example.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.