"Ice boating: Winter sailors call frozen lakes ""hard water"" and take boats fitted with runners instead of a keel sailing across solid bodies of water. The idea is the same, but the physics are slightly different. Lake Winnipesaukee in New Hampshire and Lake Minnetonka in Minnesota are popular spots for the sport. Ice boaters have recorded speeds of upwards of 100 miles, but more commonly they sail in the 55 mph range."
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