An extreme clipper was a clipper designed to sacrifice cargo capacity for speed. They had a bow lengthened above the water, a drawing out and sharpening of the forward body, and the greatest breadth further aft. In the United States, extreme clippers were built in the period 1845 to 1855.[1] British-built extreme clippers include vessels built over the period 1854 to 1870 (Annandale to e.g. Norman Court).[2]: 173–4, 253