W85 (nuclear Warhead), W85 Warhead
W85 may refer to: * W85 (nuclear warhead) * Nonconvex great rhombicuboctahedron * W85 heavy machine gun * W85, a classification in masters athletics Masters Athletics managed by World Masters Athletics is a class of the sport of athletics (sport), athletics for athletes of 35 years of age and over organized by World Masters Athletics. The events include track and field, road running and cross ...

W85 (nuclear Warhead)
The W85 was a thermonuclear warhead developed by the United States to arm the Pershing II missile. It was a variable yield device with a selectable yield of . Overview The Pershing Ia missile was armed with a W50 warhead. By the early 1970s, it was clear that this was far too large to allow the missile to be used as a tactical nuclear weapon—at the time, 400 kilotons was larger than many strategic warheads. The Pershing II had a high-accuracy maneuverable reentry vehicle (MARV) equipped with a radar terminal guidance system, which allowed it to use the lower-yield W85 warhead. This warhead was derived from the B61 Mod 3 and utilized the same pit in the primary stage of the warhead, but it has also been described as having a nuclear design similar to that of the B61-4. The total weight of the Pershing II warhead section was , which included the reentry vehicle. In 1987 a joint Army/Department of Energy study concluded that it was technically and financially feasible to r ...
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Nonconvex Great Rhombicuboctahedron
In geometry, the nonconvex great rhombicuboctahedron is a nonconvex uniform polyhedron, indexed as U17. It has 26 faces (8 Triangle, triangles and 18 Square, squares), 48 edges, and 24 vertices. It is represented by the Schläfli symbol rr and Coxeter-Dynkin diagram of . Its vertex figure is a quadrilateral#More quadrilaterals, crossed quadrilateral. This model shares the name with the convex ''great rhombicuboctahedron'', also called the truncated cuboctahedron. An alternative name for this figure is quasirhombicuboctahedron. From that derives its Bowers acronym: querco. Orthographic projections Cartesian coordinates Cartesian coordinates for the vertices of a ''nonconvex great rhombicuboctahedron'' centered at the origin with edge length 1 are all the permutations of \Bigl(\pm \left[\sqrt 2 - 1\right],\ \pm 1,\ \pm 1\Bigr). Related polyhedra It shares the vertex arrangement with the convex truncated cube. It additionally shares its edge arrangement with the great cu ...
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W85 Heavy Machine Gun
The W85 heavy machine gun or QJC-88 vehicle mounted heavy machine gun is a gas-operated heavy machine gun designed in the People's Republic of China. It fires the Soviet-designed 12.7×108mm round. The W85 was never accepted into the PLA service in its original configuration, only adopted as a vehicle mounted machine gun as the QJC-88. Overview The W85 was designed to be as light as possible for infantry use. Its small receiver is of generally rectangular cross-section, and it has a thick gas tube below the barrel containing a conventional gas piston. In addition to iron sights, it has rails for optics or anti-aircraft sights. It fires 12.7×108mm rounds from belts and is more accurate than the Type 54 heavy machine gun, but the thinner barrel overheats faster. In trials, the W85 lost out to the Type 85 as an infantry weapon and was not accepted into PLA service for this role.
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