CVN 78 – Gerald R. Ford - class Aircraft Carrier

 

USS Gerald R. Ford class aircraft carrier CVN

 

 

Units

in service

Builder

CVN 78 USS Gerald R. Ford

2015?

Huntington Ingalls Industries, Newport News Shipbuilding, Virginia, USA

CVN 79 USS John F. Kennedy

2020?

Huntington Ingalls Industries, Newport News Shipbuilding, Virginia, USA

CVN 80 USS Enterprise

?

Huntington Ingalls Industries, Newport News Shipbuilding, Virginia, USA

 

General Information:

(for specific information, namesake & history click on the ship’s name, above)

Displacement:

approx. 100000 tons (101600 metric tons)

Length:

337 meters

Beam:

77 meters (flight deck) / 40,80 meters (waterline)

Draft:

12 meters

Max Speed:

30+ knots (= 56+ km/h)

Propulsion:

2 A1B-reactors / 4 shafts / 4 propellers

Aircraft:

more than 75

Armament:

2 Mk-49 launchers for RIM-116 Rolling Airframe Missile (RAM) (2 x 21 missiles + reload)

2 Mk-29 launchers for RIM-162 Evolved Sea Sparrow (ESSM) missiles (2 x 8 missiles + reload)

3 Mk-15 Phalanx Close-In-Weapon-Systems (CIWS) (2 on LHD 5-8)

Complement:

ship: 4660

 

Design and development

The Nimitz-class aircraft carrier has been an integral part of United States power projection strategy since Nimitz was first commissioned. Displacing approximately 100,000 tons when fully loaded, a Nimitz-class carrier is capable of steaming faster than thirty knots, self-sustaining for up to ninety days, and launching aircraft to strike targets hundreds of miles away. The endurance of this class can be exemplified by USS Theodore Roosevelt, which spent 159 days underway in support of Operation Enduring Freedom without the need to be refueled or visit a port.


Over the lifespan of the class many new technologies have been successfully integrated into the design of this vessel. However, with the technical advances made in the past decade the ability of the US Navy to make improvements to this class of ship has been limited by hard constraints. “The biggest problems facing the Nimitz-class are the limited electrical power generation capability and the upgrade-driven increase in ship weight and erosion of the center of gravity margin needed to maintain ship stability.”

With these constraints in mind the Navy developed what was initially known as the "CVN-21" program, which ultimately evolved into CVN-78, Gerald R. Ford. Improvements were made through developing technologies and more efficient design. Major design changes include a larger flight deck, improvements in weapons and material handling, a new propulsion plant design that requires fewer personnel to operate and maintain, and a new smaller island that has been pushed aft. Technological advances in the field of electromagnetics have led to the development of an Electromagnetic Aircraft Launching System, (EMALS), and an Advanced Arresting Gear, (AAG). An integrated warfare system has been developed to support flexibility in adapting the infrastructure of the ship to future mission roles. The new Dual Band Radar (DBR) combines S-band and X-band radar in a single system. With new design and technology the Ford will have a 25% increase in sortie generation, threefold increase in electrical generating capacity, increased operational availability, and a number of quality of life improvements. Requirements for a higher sortie rate of around 160 exits a day with surges to a maximum of 220 sorties a day in times of crisis and intense air warfare activity, has led to design changes in the flight deck, which enable greater aircraft launch capabilities.


Flight deck

Changes to the flight deck are the most visible of the differences between the Nimitz and Gerald R. Ford classes. Several sections have been added to the layout of Nimitz's flight deck to improve aircraft handling, storage, and flow. Catapult number four on the Nimitz class cannot launch fully loaded aircraft because of a deficiency of wing clearance along the edge of the flight deck. CVN-78 will have no catapult specific restrictions on launching aircraft. The design changes to the flight deck are instrumental in the maximization of sortie generation.

The flow of weapons to the aircraft stops on the flight deck has been upgraded to accommodate for the higher sortie rates. The ship carries a store of missiles and cannon rounds for fighter aircraft, bombs and air-to-surface missiles for strike aircraft, and torpedoes and depth charges for anti-submarine warfare aircraft.

Another major change; a smaller, redesigned island will be pushed further back relative to the older classes of carriers. Moving the island creates deck space for a centralized re-arming and re-fueling location. This reduces the number of times that an aircraft will have to be moved after landing before it can be launched again. Fewer aircraft movements require, in turn, fewer deck hands to accomplish them, reducing the size of the ship's crew. A similar benefit is realized from altering the path and procedures for weapons movement by redshirts from storage to flight deck means that weapons are moved from storage to the flight deck; the new ship can support a higher sortie rate than the Nimitz class ship while using fewer crew members than the Nimitz requires. On Nimitz-class carriers the time that it takes to launch a plane after it has landed is defined by the time necessary to re-arm. To minimize this time, ordnance will be moved by robotic devices from storage areas to the centralized re-arming location via re-located weapons elevators. The new path that ordnance follows does not cross any areas of aircraft movement, thereby reducing traffic problems in the hangars and on the flight deck. According to Rear Admiral Dennis M. Dwyer these changes will make it possible to re-arm the airplanes in "minutes instead of hours."


Power generation

The propulsion and power plant of the Nimitz-class carriers was designed in the 1960s. Technological capabilities of that time did not require the same quantity of electrical power that modern technologies do. "New technologies added to the Nimitz-class ships have generated increased demands for electricity; the current base load leaves little margin to meet expanding demands for power." Increasing the capability of the U.S. Navy to improve the technological level of the carrier fleet required a larger capacity power system.

The new A1B reactor plant is a smaller, more efficient, design that provides approximately three times the electrical power of the Nimitz-class A4W reactor plant. The modernization of the plant led to a higher core energy density, lower demands for pumping power, a simpler construction, and the use of modern electronic controls and displays. These changes resulted in a two thirds reduction of watch standing requirements and a significant decrease of required maintenance.

A larger power output is a major component to the integrated warfare system. Engineers took extra steps to ensure that integrating unforeseen technological advances onto a Gerald R. Ford-class aircraft carrier would be possible. The Nimitz class will be an integral component of the fleet for a total of nearly ninety years. One lesson learned from that is for a ship design to be successful over the course of a century requires a great deal of foresight and flexibility. Integrating new technologies with the Nimitz class is becoming more difficult to do without any negative consequences. To bring the Gerald R. Ford class into dominance during the next century of naval warfare requires that the class be capable of seamlessly upgrading to more advanced systems.


Launch systems

The Nimitz-class aircraft carriers use steam-powered catapults to launch aircraft. Steam catapults were developed in the 1950s and have been exceptionally reliable. For over fifty years at least one of the four catapults has been able to launch an aircraft 99.5% of the time. However, there are a number of drawbacks. “The foremost deficiency is that the catapult operates without feedback control. With no feedback, there often occurs large transients in tow force that can damage or reduce the life of the airframe.” The steam system is massive, inefficient (4–6%), and hard to control.

Control problems with the system results in minimum and maximum weight limits. The minimum weight limit is above the weight of all UAVs. An inability to launch the latest additions to the Naval Air Forces is a restriction on operations that cannot continue into the next generation of aircraft carriers. The Electromagnetic Aircraft Launch System provides solutions to all these problems. An electromagnetic system is more efficient, smaller, lighter, more powerful, and easier to control. Increased control means that EMALS will be able to launch both heavier and lighter aircraft than the steam catapult. Also, the use of a controlled force will reduce the stress on airframes, resulting in less maintenance and a longer lifetime for the airframe. Unfortunately the power limitations for the Nimitz class make the installation of the recently developed EMALS impossible.

Electromagnetics will also be used in the new Advanced Arresting Gear system. The current system relies on hydraulics to slow and stop a landing aircraft. While effective, as demonstrated by more than fifty years of implementation, the AAG system offers a number of improvements. The current system is unable to capture UAVs without damaging them due to extreme stresses on the airframe. UAVs do not have the necessary mass to drive the large hydraulic piston used to trap heavier manned planes. By using electromagnetics the energy absorption is controlled by a turbo-electric engine. This makes the trap smoother and reduces shock on airframes. Even though the system will look the same on the flight deck it will be more flexible, safe, reliable, and require less maintenance and manning.


Communications

Another new addition to Gerald R. Ford class is an integrated search & tracking radar system. The Dual-band radar is being developed for both the DDG 1000 Zumwalt class of guided missile destroyers and the Gerald R. Ford class of aircraft carriers. The island can be kept smaller by replacing six to ten radar antennas with a single six-faced radar. The DBR works by combining the X-Band AN/SPY-3 Multi-Function Radar with the S-Band Volume Search Radar. The three faces dedicated to the X-band radar are responsible for low altitude tracking and target illumination, while the other three faces dedicated to the S-band are responsible for target search and tracking regardless of weather. “Operating simultaneously over two electromagnetic frequency ranges, the DBR marks the first time this functionality has been achieved using two frequencies coordinated by a single resource manager.” This new system has no moving parts, therefore minimizing maintenance and manning requirements for operation.


Possible upgrades

Each new technology and design feature integrated into the Ford-class aircraft carrier improves sortie generation, manning requirements, and operational capabilities. Preparing for the future is a trademark of Gerald R. Ford. New defense systems, such as free electron laser directed-energy weapons, dynamic armor, and tracking systems will require more power. “Only half of the electrical power-generation capability on CVN 78 is needed to run currently planned systems, including EMALS. CVN 78 will thus have the power reserves that the Nimitz class lacks to run lasers and dynamic armor.” The addition of new technologies, power systems, design layout, and better control systems results in an increased sortie rate of 25% over the Nimitz class and a 25% reduction in manpower required to operate.

 

images

 

cvn 79 uss john f. kennedy gerald ford class aircraft carrier us navy newport news shipbuilding

 

USS Gerald R. Ford class aircraft carrier CVN

 

USS Gerald R. Ford class aircraft carrier

 

gerald r. ford class aircraft carrier us navy cvn 78 79 john f. kennedy 80 enterprise huntington ingalls newport news shipbuilding

 

USS Gerald R. Ford class aircraft carrier CVN

(images: Northrop Grumman Shipbuilding)

 

 

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