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For both sexes, excluding the male's tusk, the total body size can range from 3.95 to 5.5 m (13.0 to 18.0 ft); the males are slightly larger than the females. The average weight of an adult narwhal is 800 to 1,600 kg (1,800 to 3,500 lb).
So, for example, if the distance between rowlocks is 42 inches, the distance from the end of the handle to the button should be (42 Ã· 2, + 2 =) 23 inches, and the overall length of the oar (23 Ã· 7, Ã 25 =) 82 inches or 6 feet 10 inches. Stock oar sizes from 6 to 10 feet are in 6 inch increments, so round up to 7 feet.