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The working face of the suction cup is made of elastic, flexible material and has a curved surface. [3] When the center of the suction cup is pressed against a flat, non-porous surface, the volume of the space between the suction cup and the flat surface is reduced, which causes the air or water between the cup and the surface to be expelled past the rim of the circular cup.
Based on this result, they built 40 such cups, attached to a steel frame that would be lifted by a crane. They set up their equipment on Treasure Island, placing the cups (total area 1,880 square inches (1.21 m 2)) on the hood, roof, and trunk of a 2,800-pound (1,300 kg) car. When they started the vacuum and began to lift the frame, the car ...
Adam's suction cups were able to hold his weight as well and were relatively much quieter than Jamie's magnets, but the climb was still clearly audible. Furthermore, the mechanisms Adam used to control the vacuums often failed, which caused him to slip and fall down the vent, blowing his cover.
Grant's device, consisting of long-handled pincers operated by a compressed-air tank on his back, proved unwieldy and difficult to aim; he took nearly 4 minutes to complete the task. Tory attached two suction cups to a vacuum-cleaner backpack, but was unable to get a strong enough grip to hold on to the pig within 5 minutes.
Adam and Jamie resorted to using a shoulder mounted air cannon Jamie built, but they still could not hit the windshield accurately enough. With one windshield left, the MythBusters instead fired at the windshield at point-blank range, "killing" Buster. However, since the cup lacked the power to harm Buster, the myth was declared busted.
A centrifugal fan is a mechanical device for moving air or other gases in a direction at an angle to the incoming fluid. Centrifugal fans often contain a ducted housing to direct outgoing air in a specific direction or across a heat sink; such a fan is also called a blower, blower fan, or squirrel-cage fan (because it looks like a hamster wheel).