![]() If the average angle of attack measured and computed in the above manner is equal to or greater than + 15°, the slide passes this performance test. The slider's starting reactions with the slide shall be only as strong as necessary to start him moving. Except when starting, the slider shall not augment the slide trip by forcibly reacting with the slide through the use of his hands, arms, feet and/or legs. The slider's descent must be headfirst, prone, belly-down, and with arms extended in front. The angle-of-attack measurement shall be made after the slider's feet have cleared the slide, the distance between the end of the slide and his feet being less than 8 inches (20.3 cm). The slider shall wear usual swimming attire. The slider's longitudinal axis shall be located by the vertical line that passes through his center of gravity when he stands erect. Angle of attack shall be taken as the angle between the slider's longitudinal axis ( Z) and the tangent to the path of his center of gravity ( X). At least five consecutive runs with the same subject shall be made in order that an average may be computed. The path angle shall be determined by measuring the angle between a tangent to the path of the center of gravity (line X) and the horizontal taken through the center of gravity (line Y). (ii ) Measurements shall be made from the still water level as the horizontal. Other force-creating means that produce equal forces on the block (300☒lbs, 1,334 newtons) may be substituted for weights if they result in substantially identical slip-resistance measurements. If the block does not move at the point that the tangential load is equal to 105 pounds (467.1 newtons), the tread surface passes this performance test. A controlled and measured force shall be applied at the tangential load ring of the block tangent to the horizontal and increased at a rate of no more than 20 pounds (88.96 newtons) per second. ![]() The block shall be loaded symmetrically on its upper bearing surface with a weight of 300☒ pounds (136.1±.9 kg). The block shall be soaked in pool water for at least 3 minutes and placed at the midpoint of the wet step with the centroid of load of the block on the longitudinal axis of the step. The tests shall be carried out on a slide assembled and installed according to the manufacturer's instructions. It shall be covered with 1⁄ 4± 1⁄ 8 inch (.64±.32 cm) of natural or silicone rubber sponge capped with porous soft leather as shown in figure C. The contact surface area of the block shall be 8 square inches (51.61 square cm) to simulate the ball of the foot (reference (d) of § 1207.11). A wooden block shall be prepared in accordance with figure C. Do not run, dive, stand, kneel, rotate or stop in the water slide.(B ) Performance test.Torrent (Green) – Remain on your tube until you come to a stop in the shutdown lane.Abyss and Vortex (Yellow and Purple) - Do not uncross your legs or attempt to sit up until you come to a stop in the shutdown lane.Riders must wait for the attendants start signal before starting the ride.Riding this water slide improperly may cause injury. Single riders are to be seated in the rear seat, facing forward, knees bent and hands on the handles. Riders must be seated, facing forward, knees bent and hands on the handles. Torrent (Green) – Water slide must be ridden with the heaviest rider seated at the back of the tube. ![]()
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