Make a mould First you need to make a mould for your canoe -- a positive mould where the canoe is moulded over the outside, not in a hollow. Glue the foam cubes together to create a 1m x 1m x 4m block ...

Members of a past Portland State University concrete canoe team are shown with their creation. (Portland State University) How do you make concrete float and steel bridges that withstand load stresses ...