October 29, 2023 | International, Aerospace
Norway To Add Sikorsky MH-60R Helicopters For Critical Maritime Missions
Norway’s order marks the second MH-60R contract award in less than a month
March 10, 2020 | International, Naval
Destroyers left behind: US Navy cancels plans to extend service lives of its workhorse DDGs
By: David B. Larter
WASHINGTON — In a move with sweeping consequences for the U.S. Navy's battle force, the service is canceling plans to add 10 years to the expected service lives of its stalwart destroyer fleet, a cost-savings measure that would almost certainly hamper plans to grow the size of the fleet.
In written testimony submitted to the Senate Armed Services Committee, the Navy's Assistant Secretary for Research, Development and Acquisition James Geurts said performing service life extensions on Burkes designed to bring them up from 35-year hull lives to 45 years was not cost-effective.
“Service life extensions can be targeted, physical changes to specific hulls to gain a few more years, or a class-wide extension based on engineering analysis,” the testimony read. “The Navy has evaluated the most effective balance between costs and capability to be removing the service life extension on the DDG 51 class.”
The Navy's destroyers are the workhorses of the fleet, with sailors spending an average of one in every four days underway, the highest rate in the fleet, according a recent report from Defense News' sister publication Navy Times.
The decision to ax the service life extensions for the Arleigh Burke class comes after years of assurances from Navy leaders that the destroyers would be modernized with an eye to growing the fleet over the coming decades. Navy leaders have offered assurances that the fiscal 2021 budget continues to grow the fleet despite its significant cuts to shipbuilding and existing force structure, but it is unclear how the fleet will continue to grow past the next five years if service life extensions on the earliest Burkes don't go forward right away.
It would also seem to have significant impact on the current push from acting Secretary of the Navy Thomas Modly to grow the fleet to 355 ships in a decade.
In its FY20 30-year shipbuilding plan, the Navy said extending the lives of the Arleigh Burkes was an imperative to growing the fleet to a battle force of 355 ships. Instead, the cancellation of the service life extensions means that between 2026 and 2034, the Navy is slated to lose 27 destroyers from its battle force.
Those losses would compound the impact of cutting 10 ships from the five-year projections in the FY21 budget, including five of the 12 proposed Flight III Arleigh Burke-class destroyers from the FY20 budget and a Virginia-class attack submarine.
The Defense Department has yet to submit its FY21 30-year shipbuilding plan, which means that it's impossible to tell how the Navy thinks these cuts would affect its total ship count in the years when it would lose Burkes at a rate of more than three per year. But the Burke retirements would begin in 2026 or 2027, years just after the service completed shedding 13 cruisers from its fleet, leaving just nine of the Navy's largest combatants in the fleet.
In a statement, Capt. Danny Hernandez, spokesman for Geurts, said there are a lot of variables in getting the fleet to its goal of 355 ships, but that the Navy's top priority is keeping the recapitalization of its retiring Ohio-class ballistic missile submarines on track.
“Like Navy leaders have stated during testimony, the tradeoffs were complex to get the right balance,” Hernandez said.
Service lives
According to a Naval Sea Systems Command document obtained by Defense News in 2018, the earliest Arleigh Burke destroyers — 27 so-called Flight I and early Flight II destroyers — have an expected hull life of 35 years. The lead ship, the Arleigh Burke, was commissioned in 1991, meaning its hull life is up in 2026.
DDG-51 through DDG-78 — the Flight I destroyers — were commissioned between 1991 and 1999. Later models — Flight IIA — have 40-year hull lives.
In 2018, then-Deputy Chief of Naval Operations for Warfare Systems Vice Adm. Bill Merz told USNI News that there were distinct advantages to upgrading the entire class, and that instead of just a combat systems modernization aimed at boosting ballistic missile defense systems, the ships would get the full hull and mechanical upgrades that would extend the ships out to 45-year service lives.
“This is an HM&E [hull, mechanical and electrical] extension, but every destroyer is already in the modernization pipeline, so every destroyer will be modernized,” Merz said. “The modernization they receive that's already programmed may carry them through.
“Obviously the threat's going to get a vote on that, but one of the beauties is instead of doing an individual ship-by-ship extension and extending the entire class, now we have the visibility to actually plan for that. We can pace it, plan it, fund it efficiently instead of one-and-done, one-and-done, one-and-done. We can be a lot more deliberate about how we handle this class.”
In testimony that year, Merz said ballistic missile defense was the biggest requirement driving the retention of the DDGs to 45 years. Compounded with cuts to the Flight III destroyers, it seems likely that the Navy by 2034 will have a significantly reduced ballistic missile defense capability with at least 32 fewer ballistic missile defense-capable destroyers in the fleet, if this budget is enacted.
When asked during its FY21 budget rollout if cutting five Flight III DDGs corresponds to a reduction in demand for ballistic missile defense-capable ships, Navy budget director Rear Adm. Randy Crites told reporters it was a decision based “strictly [on] affordability.”
The Navy has in recent years declared the Arleigh Burke hull design maxed out, with the Flight III being packed to the gunwales with power and cooling to support the inclusion of Raytheon's SPY-6 air and missile defense radar. Future combatants will have to accommodate more power generations and storage to support systems such as laser weapons and rail guns.
The excess electrical power capacity in the Ford-class aircraft carrier, for example, is one of the main reasons the Navy considers the new class valuable even as aircraft carriers become more vulnerable to high-speed, anti-ship missiles.
Bryan Clark, a retired submarine officer and senior fellow at the Hudson Institute, said the cuts were a necessary step. Clark recently authored a study with the Center for Strategic and Budgetary Assessments that called for canceling the DDG service life extensions.
“It's crazy to throw good money after bad for a bunch of ships you say you don't need,” Clark said. “I think the Navy is coming to grips with the fiscal realities; the unsustainable nature of their current plan; and the recognition it is going to have a need for fewer large surface combatants in the future and needs to husband its resources to build a larger fleet of smaller surface combatants. Those are going to be the bulk of the distributed force they intend to have.”
On the same subject
-
-
May 13, 2019 | International, Aerospace
In row with Turkey, US searching for alternative F-35 component vendors
Ashley Roque, Washington, DC - Jane's Defence Weekly Pentagon leaders are searching for alternative vendors to manufacture several F-35 Joint Strike Fighter components in the case Washington and Ankara are unable to resolve their dispute over latter's plan to field the S-400 air defence system. Ellen Lord, the US Department of Defense's undersecretary of defence for acquisition and sustainment, spoke with reporters on 10 May about a host of topics including the ongoing quarrel with Turkey stemming from its plan to field the Russian-built S-400 system over the US-built Patriot system. "We have been very clear that the F-35 and the S-400 are incompatible," Lord told reporters. "We have, for some time now, been working to look at alternative sources of supply for the F-35 supply chain that is inside Turkey right now," she later added. https://www.janes.com/article/88442/in-row-with-turkey-us-searching-for-alternative-f-35-component-vendors
-
August 14, 2019 | International, Aerospace
Precooler Technology Could Bring Advantages To Fighter Engines
By Tony Osborne Technology developed by Britain's Reaction Engines for its SABRE (Synergistic Air-Breathing Rocket Engine) hypersonic powerplant is to be fitted on the Eurojet EJ200 engine from a Eurofighter Typhoon to understand if the technology can help transform the powerplant's operating envelope. The £10 million ($12 million) project announced by the Royal Air Force (RAF) Rapid Capability Office (RCO) in July will see BAE Systems, Reaction Engines and Rolls-Royce engineers work to better comprehend Reaction's precooler technology and how it could be integrated for use on a jet engine—perhaps even the powerplant for Britain's future combat aircraft, the Tempest. Two-year project will scope integration to better understand precooler potential benefits Heat exchanger is an enabler for Reaction Engines' SABRE technology The trials represent the first acknowledged application of the precooler technology At high speed, jet engines struggle with a thermal challenge as air entering the intake becomes too hot, reducing thrust and limiting the ability to reach speeds beyond Mach 3. Reaction's precooler, essentially a highly efficient heat exchanger, already has proven its ability to quench megawatts of heat energy from the incoming air. Trials in the U.S. have shown the precooler technology to cool intake airflow from more than 800F (426C) to around 212F in just 1/20th of a second, helping to maximize performance. Applied to a fighter engine, the precooler could allow it to work more efficiently at high speeds but also enable manufacturers to be less reliant on exotic, expensive and heat-resistant materials such as titanium. This could lead to lower costs in terms of purchase and maintenance, which are both key focuses of Britain's Future Combat Air System Technology Initiative (FCAS TI). The goal of the FCAS TI is to research and develop new technologies that can be spiraled into Britain's Eurofighter Typhoons and Lockheed Martin F-35s, but also potentially featured in a combat aircraft to replace the Typhoon in the 2030s. “This is Phase 1 of something more,” Air Vice Marshal, Simon “Rocky” Rochelle, chief of staff for capability and the brainchild behind the RAF's RCO, said at the Royal International Air Tattoo, where the contract was signed. “There is something here that needs to be explored, investigated, tested and tried.” Over the next two years, engineers will study how the precooler can be integrated onto the EJ200. Once this is established, the engine and precooler will be ground-tested together. “This isn't about a new market for EJ200. We are using existing assets to try and address that heat challenge,” Conrad Banks, Rolls-Royce's chief engineer for future defense programs, tells Aviation Week. “If you can cool the intake air down, suddenly you can expand the flight envelope of your gas turbine and it introduces some exciting supersonic and hypersonic applications.” There is no suggestion the UK is looking for a hypersonic fighter, especially with the high costs associated with the airframe alone. Nonetheless, the technology could enable higher supercruise performance—sustained supersonic flight without the use of afterburner, or more simply better fuel economy. “What we will do on the testbed is assess the drop in temperature and then see how that affects the core of the engine, that then validates our model. . . . This is not about massively changing the engine,” Banks explains. How the precooler could be fitted to the engine is also part of the scope of the study. One option could be a donut-like configuration around the intake, Banks suggests. The work also will consider how the introduction of a precooler affects the rest of the airframe and whether such an installation is affordable. The precooler fitted to the EJ200 will be “designed and scaled to the engine to match its performance,” says Banks. As Banks describes it, the technology will not change the low-observability aspects of the platform such as the engine's infrared signature, pointing out that will depend on what is done on the back end of the engine. However, officials note such a heat exchanger also could be mounted to the rear of the engine. For Reaction Engines, the trials build on its lightweight heat exchanger (HTX) experiments, which were conducted in Colorado and used a J79 engine from an F-4 Phantom to feed the precooler. The technology is key to the company's SABRE concept, which is targeted at air-breathing hypersonic and space access vehicles. In this role, the engine is designed to efficiently extract oxygen from the atmosphere for rocket combustion. In the fully integrated SABRE, the chilled air will be passed from the HTX to a turbo-compressor and into the rocket thrust chamber, where it will be burned with sub-cooled liquid hydrogen fuel. Reaction Engines has raised over £100 million in the last three years from public and private sources. In addition, the UK government in 2013 announced a £60 million commitment to assist with the demonstrator engines. Strategic investments also have been made at BAE Systems in 2015 and more recently in 2018 by Rolls-Royce and by Boeing's capital venture arm, HorizonX. https://aviationweek.com/defense/precooler-technology-could-bring-advantages-fighter-engines