Yahoo! News – U. of Akron Hosts Concrete Canoe Race: “The contest gives students a chance to see engineering principles at work. The concrete canoe illustrates the rule that even extremely heavy objects float, as long as they displace more than their weight in water.
The stone boats looked like any other canoe, but ranged in weight from 130 to more than 200 pounds. A typical fiberglass or aluminum model weighs about a third of that.
The goal is to build a lighter, faster canoe, Gentner said. “