Actually if you look at all Soviet era planes ... Iluyshin .. Antonov ... for commercial use - you will see a proliferation of Anhedral regardless of size and intended use. It was literally their 'trademark'.
If you come into the west ... odd fighter / multi-role designs have used a variation where wing tips are angled down ... TSR2 for example. I live and work with Russians and what I hear from ex Military guys - is a possible reason for Soviet use of such - may have been due to construction and material limitations. We are talking relatively early days and alloys were not as tolerant of flexing as todays variants. Sit on an Airbus or later Boeinmg and watch that wing bend upwards as the plane gains lift to take-off. A way of countering in early days would be to have the wing at rest angled down. As the wing bends with increasing lift force - it compresses the spars etc. giving increased resistance and strength to that structure. The Soviets were careful not to publicise the air accident records ... but during those days Aeroflot for example had one of the worst records of all national carriers. (My Father was Senior Flight Ops and Safety for UK CAA ... was involved in not only development of Concorde, Trans Polar Flights - but also in Accident Investigation). I can remember as a child his talking about Russian incidents. Sorry to divert ... but on this theme of materials and construction : TU144 has three fundamental flaws that made it impossible to compete with Concorde. 1. The fuselage was more like a 'rolled tube' and suffered stress cracking. Concorde was different in that it could absorb such due to its modular style and also its ability to allow expansion / contraction. The metal used in the TU144 in that fuselage was sadly inferior alloy as well. 2. Engines too close together and they had to fit heat shields to the tail ... this also led to increased problems allied with 1. 3. Until the later K versions - TU144 was unable to sustain Supersonic speed without re-heat. The TU144 was relegated to primarily mail flights Moscow to Almaty - with TWO aircraft always rolled out for each flight. Its reliabiity was so poor - the second was ready to assume the flight if first failed checks. Senior Govt officials were not allowed to fly as groups on it - in fact top most officials were not allowed to fly on her. Passengers could only hold shouted conversation due to the noise level inside - another result of the tube construction and engines used. The joke was that hand written notes were the preferred communication ! Sorry to veer of there .. Back to Anhedral ... it was a standard Soviet era style ...
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