![]() ![]() Isherwood, had recently designed and overseen construction at the Novelty Iron Works in New York City of the engines for two similar gunboats, built for the Imperial Russian Navy, he had to hand a ready-made design suitable for the new U.S. Since the Navy's Chief Engineer, Benjamin F. ![]() Navy was faced with an urgent need for light-draft gunboats able to operate both at sea and close inshore to help enforce the Union blockade of Confederate ports. With the outbreak of the American Civil War in April 1861, the U.S. Little is known about their subsequent careers.Ĭonstruction and design Development The Unadilla class was sold off quickly by the Navy at the end of the war, most of them going into merchant service. As blockade ships, the 23 vessels of the class captured or destroyed no fewer than 146 enemy blockade runners during the war- about 10 percent of the total number of Confederate blockade runners so neutralized. Unadilla-class gunboats took part in many coastal and river operations, most notably as the bulk of the fleet which captured the vital Confederate port of New Orleans in April 1862. The class was designed to be fully oceangoing while having a light enough draft to be able to operate close inshore, for blockade duty or other operations in shallow waters. Ships of the class were also known as " 90-day gunboats" due to their rapid construction. The Unadilla class was a class of gunboat built for the Union Navy at the outbreak of the American Civil War. 1861Ģ × 200 IHP 30-in bore by 18 in stroke horizontal back-acting engines single screw Lithograph of a Unadilla-class gunboat, ca. ![]()
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