Isambard Kingdom Brunel, following his success in…
May 1853 CE
Isambard Kingdom Brunel, following his success in pioneering steam travel to North America with Great Western and Great Britain, had turned his attention to longer voyages as far as Australia and realized the potential of a ship that could travel round the world without the need of refueling.
On March 25, 1852, Brunel made a sketch of a steamship in his diary and wrote beneath it: "Say 600 ft x 65 ft x 30 ft" (180 m x 20 m x 9.1 m).
These measurements were six times larger by volume than any ship afloat; such a large vessel would benefit from economies of scale and would be both fast and economical, requiring fewer crew than the equivalent tonnage made up of smaller ships.
Brunel had realized that the ship would need more than one propulsion system; since twin screws were still very much experimental, he has settled on a combination of a single screw and paddle wheels, with auxiliary sail power.
Using paddle wheels means that the ship will be able to reach Calcutta, where the Hooghly River is too shallow for screws.
Brunel shows his idea to John Scott Russell, an experienced naval architect and ship builder whom he had first met at the Great Exhibition.
Scott Russell examines Brunel's plan and makes his own calculations as to the ship's feasibility.
He calculates that it will have a displacement of 20,000 tons and will require 8,500 horsepower (6,300 kW) to achieve 14 knots (26 km/h), but believes it is possible.