Katerina Swanson
Battleships are large, heavily armoured warships with immense fuel requirements. The fuel consumption of a battleship is a highly non-linear function of speed, with many variables affecting the mileage. The Iowa-class battleships, for example, carried 8,841 long tons (8,983 t) of fuel oil, which allowed for a range of 15,900 nautical miles at a speed of 17 knots. The fuel efficiency of a battleship can be improved by using one engine at maximum capacity instead of multiple engines at lower capacity. The type of fuel used also varies, with some battleships using fuel oil, diesel, or navy distillate fuel.
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What You'll Learn
USS Iowa's fuel efficiency
The Iowa-class battleship was a class of six fast battleships ordered by the United States Navy in 1939 and 1940. They were designed to meet the Second London Naval Treaty's "escalator clause" limit of 45,000 long tons (45,700 t) standard displacement. The four completed vessels, Iowa, New Jersey, Missouri, and Wisconsin, were the last battleships commissioned in the U.S. Navy.
The powerplant of the Iowas consists of eight Babcock & Wilcox boilers and four sets of double-reduction cross-compound geared turbines, with each turbine set driving a single shaft. The geared turbines on Iowa and Missouri were provided by General Electric, while those on New Jersey and Wisconsin were provided by Westinghouse. The plant produced 212,000 shp (158,000 kW) and propelled the ship to a maximum speed of 32.5 knots (60.2 km/h; 37.4 mph) at full load displacement and 33 knots (61 km/h; 38 mph) at normal displacement.
The fuel efficiency of the USS Iowa is impressive compared to earlier battleship classes. The USS Iowa and its sister ships in the Iowa class had a fuel capacity of 8,841 long tons (8,983 t) of fuel oil, which gave them a range of 15,900 nautical miles (29,400 km; 18,300 mi) at 17 knots (31 km/h; 20 mph). This fuel capacity and range were significant improvements over previous battleship classes, such as the North Carolina and South Dakota classes.
The Iowa-class battleships were also designed to be more fuel-efficient than their predecessors. They were the first US battleships to use a turbo-electric drive, which allowed for more efficient fuel usage at lower speeds. This was a significant advantage as it extended their range and reduced their fuel consumption, making them more suitable for the long-distance patrols and deployments that became common during World War II.
In addition to their fuel capacity and range, the Iowa-class battleships were also modified to burn navy distillate fuel and carry additional fuel oil. In 1954, proposals were made to convert the Iowa-class ships to BBGs, which included adding 8,600 long tons (8,700 t) of additional fuel oil to serve as ballast and for refuelling other ships. These modifications further improved the fuel efficiency and range of the Iowa-class battleships, making them versatile and adaptable to the changing needs of naval warfare.
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WWII US battleships' fuel usage
The fuel consumption of US Navy battleships during World War II is an interesting topic. The fuel consumption of ships is a highly non-linear function of speed, with many variables affecting a ship's efficiency. For example, wind and current can have a major impact on a ship's fuel efficiency.
The US Navy's fuel consumption was documented in the Hyperwar website's tables from the US Navy document FTP 218: War Service Fuel Consumption of US Navy Surface Vessels. This document contains information on the fuel consumption of the three most modern battleship classes deployed by the US during World War II: North Carolina, South Dakota, and Iowa. These ships were all in service on the morning of 7 December 1941, with the North Carolina class being the only World War II-era ships.
The fuel consumption of these ships varied greatly. The USS North Carolina was noted to be particularly inefficient compared to the other two classes, with a fuel consumption rate at 25 knots. In contrast, the USS Iowa was much more fuel-efficient, with a similar fuel consumption rate at 29 knots. This difference in fuel efficiency becomes more pronounced at higher speeds, with the USS Iowa being able to maintain higher speeds while consuming less fuel.
The USS Iowa's fuel efficiency is impressive when compared to earlier battleship classes. The fuel consumption of these ships could reach 9000+ gallons of fuel per hour. To put this into perspective, a modern Arleigh Burke-class destroyer burns a minimum of about 1,000 gallons of fuel per hour. This highlights the vast improvements in naval technology and the importance of fuel efficiency in naval warfare.
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Fuel capacity and sailing time
The fuel capacity and sailing time of battleships are influenced by various factors, including the ship's class, engine setup, speed, weight, and wave-making resistance.
Let's take the example of the Iowa-class battleships. These ships could carry 8,841 long tons (8,983 metric tons) of fuel oil, which gave them a range of 15,900 nautical miles (29,400 km; 18,300 mi) at a speed of 17 knots (31 km/h; 20 mph). At this speed, the Iowa-class battleships could sail for extended periods without refuelling.
However, the fuel consumption of a battleship increases significantly with speed. For example, a modern Arleigh Burke-class destroyer can burn a minimum of about 1,000 gallons of fuel per hour, but this figure can vary greatly depending on speed and other factors such as wind and current and engine setup.
To calculate the sailing time of a battleship, one can use the formula that considers the ship's fuel consumption as a function of speed and fuel capacity. By dividing the total fuel capacity by the fuel consumption rate at a given speed, we can determine the approximate sailing time before the ship runs out of fuel.
It is important to note that fuelling beyond the radius oil capacity, or the sum of fuel oil and diesel capacities, can increase the ship's radius of operation but reduces its resistance to underwater damage. This trade-off is crucial for commanders to consider when making strategic decisions.
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Effect of speed on fuel consumption
The fuel consumption of a battleship is a highly non-linear function of speed. A ship's mileage is affected by speed in unique ways. When a ship moves quickly, it takes significantly more effort to push it through the water because it creates larger waves. Wind and current can also have a major impact on a ship's efficiency.
The Iowa-class battleship, for example, had a maximum speed of 32.5 knots (60.2 km/h or 37.4 mph) at full load displacement and 33 knots (61 km/h or 38 mph) at normal displacement. At a speed of 17 knots (31 km/h or 20 mph), it could travel 15,900 nautical miles (29,400 km or 18,300 mi) using 8,841 long tons (8,983 t) of fuel oil.
The fuel efficiency of the USS Chafee was found to be 72% higher in July than in May 2010, due to the ship primarily operating with a single engine running at maximum capacity rather than multiple engines running at lower capacities.
The fuel consumption of an Arleigh Burke-class destroyer, a hulking vessel, is estimated at a minimum of about 1,000 gallons of fuel per hour. However, this figure does not account for various factors and variables, and the Navy does not utilise it in the same way that "miles per gallon" is used for vehicles.
The impact of speed on fuel consumption is also influenced by a ship's engine setup. Arleigh Burke-class destroyers, for instance, are equipped with four gas turbine propulsion engines that are most efficient at high RPMs. Therefore, operating with a single engine at full capacity can be more efficient than dividing the workload between two engines, depending on the required speed.
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Cost of battleship fuel upgrades
The cost of fuel upgrades for battleships can vary depending on various factors, including the type of battleship, the extent of the upgrades, and the specific requirements of the naval force. Let's take a look at some examples and factors that can influence the cost of such upgrades:
Example 1: Iowa-class Battleship Fuel Upgrades
The Iowa-class battleships of the United States Navy underwent significant fuel and modernization upgrades between 1981 and 1988. These upgrades included converting the battleships to burn navy distillate fuel and equipping them with modern electronic warfare suites, close-in weapon systems for self-defense, and missiles. The Navy spent approximately $1.7 billion on these upgrades, which was comparable to the cost of building four Oliver Hazard Perry-class frigates. This example highlights how the cost of fuel upgrades can be part of a larger modernization program, and the expenses can be substantial.
Factors Influencing Cost:
- Type of Fuel: The cost of fuel upgrades will depend on the type of fuel being adopted. For example, the Iowa-class battleships transitioned from fuel oil to navy distillate fuel, which may have different procurement and storage requirements.
- Engine Modifications: Upgrading to a new type of fuel may necessitate modifications to the battleship's engines and propulsion systems. Any changes to the powerplant and associated machinery can significantly impact the cost of the upgrade.
- Additional Systems: Fuel upgrades can be coupled with the integration of new weapons, electronics, and defence systems, as seen with the Iowa-class battleships. These additional systems contribute to the overall cost.
- Size and Number of Vessels: The cost will depend on the number of battleships undergoing the fuel upgrade. Additionally, larger battleships will likely require more extensive modifications, impacting the overall expense.
- Labour and Maintenance: The labour costs for skilled workers and ongoing maintenance expenses associated with the fuel upgrade should also be considered.
Example 2: USS Chafee's Fuel Efficiency Improvements
In a different context, the USS Chafee improved its fuel efficiency by 72% in July 2010 compared to May of the same year. This improvement was achieved by primarily utilizing one engine at maximum capacity instead of multiple engines at lower capacities. While this example does not specify the financial savings, it demonstrates that fuel upgrades or operational adjustments can lead to significant efficiency gains, potentially reducing fuel costs.
In summary, the cost of battleship fuel upgrades can vary widely depending on the specific circumstances and requirements of the naval force. Fuel upgrades are often part of broader modernization programs, and costs can run into billions, comparable to the construction of new vessels. Factors such as the type of fuel, engine modifications, additional systems, the size and number of vessels, and labour contribute to the overall expense of such upgrades.
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Frequently asked questions
The fuel consumption of a battleship varied according to its class and speed. For example, an Arleigh Burke-class destroyer burns a minimum of about 1,000 gallons of fuel per hour, while the Iowa-class battleship can carry 8,841 long tons (8,983 t) of fuel oil, giving it a range of 18,300 miles at 20 mph.
Speed affects a ship's mileage in unique ways. When a ship moves quickly, "it takes an inordinately greater effort to push it through the water because it makes bigger and bigger waves."
Battleships used fuel oil and diesel.
