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June 14, 2018 | International, Aerospace

Pratt & Whitney is pitching a new version of the F-35 engine

WASHINGTON — Pratt & Whitney is developing upgrades to the F-35's engine that will give it the power and cooling necessary to make the U.S. Defense Department's most sensor-heavy fighter jet even more of a powerhouse.

The new Growth Option 2.0 upgrade for the F135 engine, launched on Tuesday, adds a more advanced power and thermal management system that could be used to help the F-35 incorporate new weapons and sensors, the company said.

It also integrates a new compressor and turbine technologies that yield greater thrust and fuel savings, which were part of the Growth Option 1.0 concept unveiled in 2017.

In a June 12 interview with Defense News, Matthew Bromberg, president of Pratt & Whitney's military engines unit, said the company decided to work on improvements to the F135's power and thermal management system, or PTMS, based on feedback from the F-35 Joint Program Office.

Pratt in 2017 tested an early version of the Growth Option 1.0 motor called the fuel burn reduction demonstrator engine, which demonstrated that the upgrade could improve thrust by up to 10 percent and reduce fuel consumption by up to 6 percent.

But while the community that flies the F-35B short-takeoff-and-vertical-landing variant was gung-ho on the thrust improvements, the JPO said that better power and cooling was what was really needed — especially as the program transitions from the development phase to modernization, also known as Block 4 or Continuous Capability Development and Delivery, Bromberg said.

Pratt has already begun testing some technologies from the Growth Option 2.0 suite in various rigs and demonstrators. Bromberg called the upgrades “relatively low risk” and said it could probably be proven out in a four-year technology demonstration program.

But he declined to talk about completed testing or to quantify the new power and cooling improvements, saying only that they were “significant.”

Although the Defense Department hasn't signed onto an upgraded F135 engine as part of the Continuous Capability Development and Delivery effort, Pratt executives have been hopeful that it will do so as it finalizes that strategy.

“As the F-35 program moves forward with the Continuous Capability Development and Delivery strategy, we strive to stay in front of propulsion advances needed to enable F-35 modernization,” Bromberg said in a statement. “We're continuously assessing customer needs and responding with technology options to keep them ahead of evolving threats.”

https://www.defensenews.com/industry/2018/06/13/pratt-whitney-is-pitching-a-new-version-of-the-f-35-engine/

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    December 4, 2020 | International, Aerospace

    This company wants to launch satellites into space via drone

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The company has yet to conduct its first test flight but is working toward airworthiness certification. Leaders hope to launch a payload for the military before the end of 2021. “We have a small launch vehicle that's more or less designed from scratch to be reusable and for responsive space access,” Skylus told C4ISRNET in an interview. “We do this by operating this sort of three stage launch vehicle stack. The first stage is an unmanned aircraft that is completely autonomous. The second and third stages are rocket systems.” Following take off, the drone rises to between 30,000 and 60,000 feet, where the rocket separates and ignites, launching the payload into orbit. Ravn X can take off and land horizontally on any airstrip at least one mile long. “The entire system is designed for a turnaround time and response time of about 180 minutes,” Skylus explained. The idea of launching satellites into space from the air isn't a new concept. For example, Northrop Grumman's Pegasus rocket ― designed to be launched into orbit from a carrier aircraft ― has been used for Defense Advanced Research Projects Agency, Air Force and NASA missions since the 1990s, with the most recent mission taking place in October 2019. A more recent entrant into the air-launch-to-orbit arena is Virgin Orbit's LauncherOne rocket. The company's first test flight, which failed to reach orbit, was conducted in May 2020. Aevum thinks of itself as taking the concept one step further by adding autonomy to the launch process. “This entire process is more or less fully autonomous, and this allows us to basically reduce the cost of labor that's required by about 90 percent,” said Skylus. Aevum's approach also gets at one of the most frustrating issues with launch: weather. In 2018, the Defense Advanced Research Projects Agency announced the DARPA Launch Challenge, where small launch companies were asked to show that they could put a payload into space within just 30 days. While about 50 companies applied, by 2019 their were only three companies remaining in the competition. By 2020, there was just one: Astra Space. The company came close to achieving its goal, ultimately failing after inclement weather forced them to scrub multiple launch attempts. Ravn X is largely impervious to those issues. “Because of the architecture, we're really not dependent on weather and those types of things. We expect to be available more than 96 percent of the year,” said Skylus. The company is already drawing attention from the Department of Defense. Ravn X's first mission will be the ASLON-45 mission for the U.S. Space Force, a $5 million contract. With that mission, the focus is on showing how the company can get a payload into orbit in 24 hours or less, said Skylus. 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Having a robust U.S. industry providing responsive launch capability is key to ensuring the U.S. Space Force can respond to future threats.” The Pentagon has been pushing industry for responsive launch solutions, ensuring that they can place payloads into orbit with little notice. Aevum's focus on software and automation gives them an edge in meeting those elusive responsive launch requirements, Skylus said. “The responsive space launch type of problem has been a problem for several decades now, and the government has been seeking a solution to this. While others, our peers, are trying to tackle this from a technology/engineering perspective, Aevum is really tackling the problem from a system level perspective,” said Skylus. That's meant taking proven hardware solutions and applying autonomous software solutions to the ground processes and mission assurance elements. “If you look at our financials and things like that, we really do look more like a software company as opposed to a launch company,” said Skylus. “Which is great, because that means we're profitable right out of the gate.” For Aevum, the focus is on being that dependable, responsive launch service, and that may come at a premium for prospective customers, including the Pentagon. “We're not looking to be the lowest cost provider. That was never something that we claimed to be,” said Skylus. “Our focus has been: How do we make sure that we can go when our customers need to go? “Our niche market is going to be composed of customers like the Department of Defense who can't afford to wait a week to gather intel ... Or a customer like a commercial constellation customer who if they're down for over a week, they're going to lose more in revenue than they would be willing to pay for a launch,” he continued. “Those are the customers that we're really targeting.” https://www.c4isrnet.com/battlefield-tech/space/2020/12/03/this-company-wants-to-launch-satellites-into-space-via-drone/

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