5fish
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In the early days of our civil war, the union navy needed ships that where ocean-worthy with a shallow draft for coastal portals... Unadilla class ship was born...
The Unadilla class was a class of gunboat built for the Union Navy at the outbreak of the American Civil War. Ships of the class were also known as "90-day gunboats" due to their rapid construction. 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.
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. 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.
The Unadilla class was sold off quickly by the Navy at the end of the war, most of them going into merchant service. Little is known about their subsequent careers.
Snip...
The first vessel of the class, Unadilla, was launched on 17 August 1861, barely two months after the signing of the contract. The rest rapidly followed, with another three being launched in August, four in September, fourteen in October and the last one, Penobscot, in November.[3][4] Unadilla was again first to be commissioned, on 30 September, just 93 days after the laying of her keel.[9] A total of eleven were commissioned before the end of the year, and another eleven by February 1862. Marblehead was the last ship of the class to enter commission, on 8 March.[3][4]
Though popularly known as the "90-day gunboats" then, only the first four vessels of the class were commissioned in anything like 90 days.[3][4] The rest took an average of about three months just to launch. Overall, the ships averaged a little under six months from signing of the contract to commission.
Here is a link to the list of them and more details...
Unadilla-class gunboat - Wikipedia
Another link:
Snip... https://www.navalhistory.org/2018/11/28/unadilla-class-gunboats
This made me wonder: why, if the Unadilla-class was successful during the war, would the Navy allow the class to essentially go extinct? After doing some more digging, the main reasons I saw for the Unadilla-class’s undoing was the design of the vessel. The hulls of the 90-day gunboats were mainly made of wood, with iron braces only used to support and strengthen the wooden structure. Unfortunately, the success of modern artillery pieces against wooden hulls proved that iron and steel was the way of the future, and to keep outdated equipment would weaken the overall strength of the Navy.
If the wooden hull was the Achilles’ heel of the Unadilla-class, the weight of its machinery was the death knell. As with most Isherwood-designed vessels, the engines of these gunboats were more than two times the necessary weight. This hindered the gunboats’ performance immensely, especially in regards to the main purpose of their creation: to act as a blockade. While most blockade runners could reach speeds of up to 14 knots, the Unadilla-class was lucky if they could get up to 10 knots, making it near impossible for the Union ships to catch their targets.
The Unadilla class was a class of gunboat built for the Union Navy at the outbreak of the American Civil War. Ships of the class were also known as "90-day gunboats" due to their rapid construction. 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.
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. 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.
The Unadilla class was sold off quickly by the Navy at the end of the war, most of them going into merchant service. Little is known about their subsequent careers.
Snip...
The first vessel of the class, Unadilla, was launched on 17 August 1861, barely two months after the signing of the contract. The rest rapidly followed, with another three being launched in August, four in September, fourteen in October and the last one, Penobscot, in November.[3][4] Unadilla was again first to be commissioned, on 30 September, just 93 days after the laying of her keel.[9] A total of eleven were commissioned before the end of the year, and another eleven by February 1862. Marblehead was the last ship of the class to enter commission, on 8 March.[3][4]
Though popularly known as the "90-day gunboats" then, only the first four vessels of the class were commissioned in anything like 90 days.[3][4] The rest took an average of about three months just to launch. Overall, the ships averaged a little under six months from signing of the contract to commission.
Here is a link to the list of them and more details...
Unadilla-class gunboat - Wikipedia
Another link:
Snip... https://www.navalhistory.org/2018/11/28/unadilla-class-gunboats
This made me wonder: why, if the Unadilla-class was successful during the war, would the Navy allow the class to essentially go extinct? After doing some more digging, the main reasons I saw for the Unadilla-class’s undoing was the design of the vessel. The hulls of the 90-day gunboats were mainly made of wood, with iron braces only used to support and strengthen the wooden structure. Unfortunately, the success of modern artillery pieces against wooden hulls proved that iron and steel was the way of the future, and to keep outdated equipment would weaken the overall strength of the Navy.
If the wooden hull was the Achilles’ heel of the Unadilla-class, the weight of its machinery was the death knell. As with most Isherwood-designed vessels, the engines of these gunboats were more than two times the necessary weight. This hindered the gunboats’ performance immensely, especially in regards to the main purpose of their creation: to act as a blockade. While most blockade runners could reach speeds of up to 14 knots, the Unadilla-class was lucky if they could get up to 10 knots, making it near impossible for the Union ships to catch their targets.