how heavy are the stones in olympic curling
Curling The curling stone (also sometimes called a rock in North America) is made of granite and is specified by the World Curling Federation, which requires a weight between 38 and 44 pounds (17.24 and 19.96 kg), a maximum circumference of 36 inches (914.4 mm) and a minimum height of 4.5 inches (114.3 mm).[30] The only part of the stone in contact with the ice is the running surface, a narrow, flat annulus or ring, 0.25 to 0.50 inches (6.4 to 12.7 mm) wide and about 5 inches (130 mm) in diameter; the sides of the stone bulge convex down to the ring and the inside of the ring is hollowed concave to clear the ice. This concave bottom was first proposed by J. S. Russell of Toronto, Ontario, Canada sometime after 1870, and was subsequently adopted by Scottish stone manufacturer Andrew Kay.[23]
Curling at the 2018 Winter Olympics The curling competition at the 2018 Winter Olympics was held between 8 and 25 February 2018 at the Gangneung Curling Centre.[1] This was the seventh time that curling is on the Olympic program. In each of the men's and women's competitions, ten nations competed. As decided in 2015, a third competition, mixed doubles curling, has graduated from a spectator sport to a full medal competition. Teams consisted of one woman and one man. There were eight participating countries in the mixed competition.[2]