Description
The Allaire Iron Works of New York supplied Savannah's engine cylinder, while the rest of the engine components and running gear were manufactured by the Speedwell Ironworks of New Jersey. The 90-horsepower low-pressure engine was of the inclined direct-acting type, with a single 40-inch-diameter (100 cm) cylinder and a 5-foot stroke. Savannah's engine and machinery were unusually large for their time, and after the ship's launch, Moses Rogers had difficulty locating a suitable boiler, rejecting several before settling on a copper model by boiler specialist Daniel Dod. The ship's wrought-iron paddlewheels were 16 feet in diameter with eight buckets per wheel. For fuel, the vessel carried 75 tons of coal and 25 cords of wood.
As the ship was too small to carry much fuel, the engine was intended only for use in calm weather, when the sails were unable to provide a speed of at least four knots. In order to reduce drag and avoid damage when the engine was not in use, the paddlewheel buckets were linked by chains instead of bars, enabling the wheels to be folded up like fans and stored on deck. Similarly, the paddlewheel guards were made of canvas stretched over a metal frame which could also be packed away when not required. The whole process of retracting the wheels and guards took no more than about 15 minutes. Savannah is the only known ship to have been fitted with retractable paddlewheels.
Savannah's hull and rigging were constructed under the direction of Captain Steven Rogers, who later became the ship's Sailing Master. The ship was full rigged like a normal sailing ship, excepting the absence of royal-masts and royals. Contemporary engravings suggest that Savannah's mainmast was set further astern than in normal sailing ships, in order to accommodate the engine and boiler.
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