6061 alloy on most manufactures . .060 thick. Standard. .032 light weight
The beaver canoe first ran in the 1979 usca nationals . On the Wisconsin river . There was 4 of them in that race . None of them placed in the top 3 . Alumicraft 185 s beat them . Beaver ran good ,but did not dominate . The Ohi
Aluminum canoes were a step forward from the heavy wood and canvas boats that took a lot of hand work. Al boats were cheaper and lighter, but aluminum cannot be bent into complex shapes. The boats have full ends and are slow but plenty buoyant going over waves and carrying a load. They stick on rocks and are made in 2 halves held together by a keel. They can take a beating and spend the winter in a snowbank without damage.
We paddled from a lot from 1960 until around 1990 when fiberglass and other modern materials became readily available.