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2. Roller coaster wheel assembly - Wikipedia

   en.wikipedia.org/wiki/Roller_coaster_wheel_assembly

   Running wheels are typically the largest set of wheels in the assembly, and roll on the top of the rails. These wheels bear the weight of the train. They are typically made from a polyurethane or nylon/polyurethane blend, [1] while side friction and up-stop wheels can be made of the same materials or steel. Some older wooden roller coasters ...

3. Caster board - Wikipedia

   en.wikipedia.org/wiki/Caster_board

   The bottom of a typical casterboard. A caster board, vigorboard or waveboard is a two-wheeled, human-powered land vehicle.Other names are J-board and RipStik (sometimes written ripstick or rip stick), both of which are derived from commercial brands.

4. Caster - Wikipedia

   en.wikipedia.org/wiki/Caster

   Large diameter caster wheels are able to bridge gaps like that between the floor and an elevator car. However, the larger the diameter of a caster wheel, the higher the caster support arm must be. Either the base of a low-hanging object must be lifted higher above the wheels, or the casters must hang out to the sides straddling the low-hanging ...

5. Ship's wheel - Wikipedia

   en.wikipedia.org/wiki/Ship's_wheel

   Diagram of the steering gear of an 18th- to 19th-century sailing ship [3]: 151 Helm of TS Golden Bear. A ship's wheel is composed of eight cylindrical wooden spokes (though sometimes as few as six or as many as ten or twelve depending on the wheel's size and how much force is needed to turn it.) shaped like balusters and all joined at a central wooden hub or nave (sometimes covered with a ...

6. List of polyurethane applications - Wikipedia

   en.wikipedia.org/wiki/List_of_polyurethane...

   Industrial Insulation. Rigid polyurethane foam is used in various industries to provide thermal insulation to installations and pipes. In particular, the piping for district heating systems in Europe is primarily insulated using a pre-insulated pipes sandwich assembly composed of a steel heat service pipe, an insulating layer (polyurethane foam) and a polyethylene (PE) casing, which are bonded ...

7. Frank Nasworthy - Wikipedia

   en.wikipedia.org/wiki/Frank_Nasworthy

   Frank Nasworthy is notable in the history of skateboarding for introducing polyurethane wheel technology to the sport in the early 1970s. After graduating from Annandale High School in Northern Virginia in 1967, Nasworthy attended Virginia Tech for a year. Back with his family for the summer of 1970, he visited a plastics factory in ...