An item referred to the Army and Naval Journal reporting that the building costs for the new British and American warships were about 7,5% higher as result of the coppering, but on the other hand was the average speed with a similar horsepower a mile higher. The displacement also increased, For example a ship with a displacement of 3.400 ton was the displacement enlarged with the wood doubling and the copper by around 200 ton or 6%.
