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Sikorsky-Boeing SB-1 Defiant & Bell-Lockheed Martin V-280 Valor

The Bell Helicopter design, which is called the V-280 Valor, is an advanced tilt-rotor design that is based upon technology similar to the Bell-Boeing V-22 Osprey 

The Sikorsky-Boeing entry, called the SB-1 Defiant, is a compound helicopter design with co-axial rotors and a pusher-propeller. dailymail

Two teams - Sikorsky-Boeing with their Defiant, and Bell Helicopter-Lockheed Martin with their V280, are also vying for the lucractive contract to create a manned version of the  'supercopter'.

Both are set to take off for the first time next year in the final stage of the battle to replace the Black Hawk.

The two prototype aircraft will be built and flown as part of a project called the Joint Multi Role Technology Demonstrator Air Vehicle, which will then inform the Army's Future Vertical Lift (FVL) program to replace the long-serving Sikorsky UH-60 Black Hawk and Boeing AH-64E Apache.

The FVL program will also inform the US Navy's MH-XX program to replace the MH-60 Seahawk.

Bell revealed this week it believes it's entrant could enter service in 2024. 

'There's no real technology that needs to be further developed for us to be able to design and develop an aircraft that meets those requirements,' said Vince Tobin, Bell's vice president of advanced tiltrotor systems, according to DefenceOne. 

'Our big push now is that, after we fly this and prove out that we can build this aircraft, that we are ready to go into engineering and manufacturing development.'

The Sikorsky-Boeing team is also hoping to fly in 2017, said Doug Shidler, Sikorsky's program director for its Joint Multi-Role tech demonstrator.

'The intent of the JMR TD effort is to maximize the knowledge gain and risk reduction toward an anticipated Future Vertical Lift acquisition program,' said Dan Bailey, the Army's JMR/FVL program director when the two finalists were announced. 

Two other teams led by Karem Aircraft and AVX Aircraft were not selected for continued development, but the service is still interested in their technologies.

'The Army will seek to continue technology development efforts with those teams based on resources and opportunities,' the service said.

The Sikorsky-Boeing entry, called the SB-1 Defiant, is a compound helicopter design with co-axial rotors and a pusher-propeller.  

The Bell Helicopter design, which is called the V-280 Valor, is an advanced tilt-rotor design that is based upon technology similar to the Bell-Boeing V-22 Osprey. 

The new tilt-rotor is smaller, faster and much more manoeuvrable than the Osprey and has a top speed of over 300 knots.

The Future Vertical Lift (FVL) is a program to develop a family of military helicopters for the United States Armed Forces. 

The Bell Helicopter design, which is called the V-280 Valor, is an advanced tilt-rotor design that is based upon technology similar to the Bell-Boeing V-22 Osprey.

The Bell V280 program completed its final design and risk review period in August, and construction has already begun. dailymail

Four different sizes of aircraft are to be developed, and they will  share common hardware such as sensors, avionics, engines, and weapons. 

It will eventually lead to replacements for the Army's UH-60 Black Hawk, AH-64 Apache, CH-47 Chinook, and OH-58 Kiowa helicopters.

The precursor for FVL is the Joint Multi-Role (JMR) helicopter program, which will provide technology demonstrations planned for 2017. 

Chris Gehler, director of Bell Helicopter's advanced tilt-rotor systems, said the V280 program completed its final design and risk review period in August. Spirit Aerosystems has completed building the fuselage in Wichita, Kansas, and shipped it to Amarillo just before AUSA.

'This is real. The aircraft is coming together now,' Gehler told Defense News. 

Spirit Aerosystems has completed building the fuselage in Wichita, Kansas, and shipped it to Amarillo ahead of flight tests in 2017. dailymail

THE DEFIANT-1 

The Sikorsky-Boeing entry, called the SB-1 Defiant, is a compound helicopter design with co-axial rotors and a pusher-propeller.

The design will have a cruise speed of 250 kn (290 mph; 460 km/h), but less range due to using the 'old' T55 engine. 

The SB-1 will be quick and nimble, with fast acceleration and deceleration, side-to-side movement, and hovering with the tail up and nose down.

The Defiant demonstrator will be powered by the Honeywell T55, which powers the CH-47 Chinook.

It will be slightly modified to better operate at slower speeds down to 85% rpm.

'We've got all kinds of pieces and parts, different technologies and things that are yielding today and starting to flow to Amarillo.'

'About this time next year,' he said, the aircraft will look ready to fly and the team will be running pre-flight checks, ground runs, shake tests and other reliability activities.

The U.S. Army-led Joint Multi-Role Demonstrator (JMR-TD) program is the science and technology precursor to the Department of Defense's Future Vertical Lift program expected to replace 2,000 to 4,000 medium-class utility and attack helicopters. 

The U.S. Army and Department of Defense are seeking leap-ahead capabilities and have identified a speed of 230+ knots as a key discriminating capability. 

The U.S. Army's current helicopter fleet cruises at 140 knots. 

The Bell Helicopter design, which is called the V-280 Valor, is an advanced tilt-rotor design that is based upon technology similar to the Bell-Boeing V-22 Osprey. 

The new tilt-rotor is smaller, faster and much more manoeuvrable than the Osprey and has a top speed of over 300 knots.

The first flight of the next generation tiltrotor is scheduled for the second half of 2017. 

The V-280 tiltrotor will provide unmatched speed, range and payload, along with unmatched agility at the objective, Boeing says.  

The first flight of the next generation tiltrotor is scheduled for the second half of 2017. dailymail

Read more:

• Industry Hopes Army's Future Vertical Lift Program Takes Off
• The Futuristic Aircraft That May Replace the Black Hawk Will Fly Next Year - Defense One

Bell-Lockheed Martin V-280 Valor

Sikorsky-Boeing SB-1 Defiant

V-247 Vigilant: Tiltrotor drone can transform between helicopter and plane

V-247 Vigilant, Bell says it will 'combine the vertical lift capability of a helicopter with the speed and range of a conventional fixed-wing aircraft'.

Bell has unveiled a radical new tiltrotor drone that could be launched from warships to carry out attacks automatically.

Called the V-247 Vigilant, Bell says it will 'combine the vertical lift capability of a helicopter with the speed and range of a conventional fixed-wing aircraft'.

It boasts the craft could be in service by 2023, and is able to take off from anywhere - even a dangerous ship's deck. 

'The Bell V-247 Vigilant is the next leap in innovation making the future of aviation a reality today – it's a testament to the power and versatility of tiltrotor flight,' said Mitch Snyder, president and CEO at Bell Helicopter. 

'The unmanned tiltrotor is the latest example of how we are changing the way the world flies, taking our customers into the dynamic world of next-generation aircraft.' 

The aviation giant says the UAS is designed to provide 'unmatched long-endurance persistent expeditionary and surveillance capability and lethal reach, as well as runway independence to operate successfully in maritime environments and locations without secure runway availability.'

The bays on the Bell V-247 Vigilant are designed to carry high definition sensors, fuel, sonar buoys, light detection and ranging (LiDAR) modules, 360-degree surface radar modules, an MK-50 torpedo or Hellfire or JAGM missiles optimally.

 With its signature blade fold wing stow design, it will fit inside a DDG hangar space, and two can be loaded on a C-17 aircraft. 

'Leveraging lessons learned from our extensive history and experience with tiltrotors, we have found the best available solution to fulfill the Marine Corps need for a Group 5 UAS,' said Vince Tobin, vice president, advanced tiltrotor systems at Bell Helicopter. 

 'The Bell V-247 Vigilant will give military customers the capabilities needed to reduce the complexity of deployment, increase speed of employment, reduce mission times and increase response time – all critical elements to completing missions to save lives and protect our freedom.'

The aviation giant says the UAS is designed to provide 'unmatched long-endurance persistent expeditionary and surveillance capability and lethal reach, as well as runway independence to operate successfully in maritime environments and locations without secure runway availability.'

VIGILANT SPECS:

-  Single engine tiltrotor unmanned aerial system 

-  250 knots cruise speed; 180 knots endurance speed; >300 knots at maximum continuous power

-  Combat range: 450 nautical miles mission radius

-  Time on station: 11 hours 

-  Can hold a combination of fuel, armament, and sensors, up to 13,000 pounds 

Air-to-air refueling

BELL HELICOPTER/LOCKHEED MARTIN'S V280 Valor



Sikorsky-Boeing SB-1 Defiant

Radical hypersonic engine to take to the skies

Sabre engine.

 The Oxfordshire-based firm has been developing a turbine that combines both jet and rocket technologies to achieve rates five times the speed of sound, to fly anywhere in the world in just four hours

'Fighter jet' sized 4,000mph engine that could go from New York to London in under two hours to be built

Plans for a revolutionary hypersonic propulsion system have now taken a big step toward the construction of a ground demonstrator – but at roughly a quarter the size of the original vision.

Reaction Engines Ltd has scaled back its design for the Sabre engine to bring about a demonstrator that is more affordable and better suited to early applications, including a potential X-plane.

The Oxfordshire-based firm has been developing a turbine that combines both jet and rocket technologies to achieve rates five times the speed of sound, to fly anywhere in the world in just four hours.

Rather than aiming for a demonstrator that can achieve more than 150,000 lb thrust, the firm will instead now target an engine size capable of roughly 44,000 lb thrust, according to Aviation Week Network.

In the new plans for the Sabre demonstrator, researchers will target a smaller engine similar in size to the F135 engine for the F-35 joint Strike Fighter (JSF).

Such a system, scaled back due to the slowness of funding, could be used in multistage vehicles or hypersonic craft the size of an X-plane.

‘It is now more affordable, more rapid to execute and will potentially find its first application quicker,’ Reaction CEO Mark Thomas told Aviation Week Network.

‘It’s a quarter of Sabre, effectively. In an application for something like Skylon, the engine would have four combustion chambers connecting to the single nozzle, a bypass system and the same turbomachinery, intake and heat exchanger.

In the new plans for the Sabre demonstrator, researchers will target a smaller engine similar in size to the F135 engine for the F-35 joint Strike Fighter (pictured)

FUTURE OF FLIGHT? HOW THE SABRE JET ENGINE WORKS

A model of the revolutionary Sabre engine is pictured  

The revolutionary Sabre engine could allow aircraft to take off from a runway and accelerate to five times the speed of sound, before switching to a rocket mode, propelling it into orbit.

The Sabre engine works by burning atmospheric air in combustion chambers. 

It then uses the heat to turbo-charge the engine.

At the moment, rockets have to carry liquid oxygen and liquid hydrogen to power them and the cost of carrying this heavy fuel is expensive. 

The new engine creates its own liquid oxygen by cooling air entering the engine from 1,000°C to minus 150°C in a hundredth of a second – six times faster than the blink of an eye – without creating ice blockages.

The revolutionary Sabre engine could allow aircraft to take off from a runway and accelerate to five times the speed of sound, before switching to a rocket mode, propelling it into orbit. A computer generated image of the ground demonstrator is pictured.  dailymail

This new class of aerospace engine is designed to enable aircraft to operate from standstill on the runway to speeds of over five times the speed of sound in the atmosphere. 

It can then transition to a rocket mode of operation, allowing spaceflight at speeds up to orbital velocity, equivalent to 25 times the speed of sound.

‘There is a view that you could modularize the engine to a far higher degree, so that you could have four compressors and still have a large heat exchanger. From this point onward you could go completely modular, so if you could demonstrate one element, then it is all about integration.’

Along with a JSF-sized engine for the ground demonstrator, the firm plans to solve the power gap between air-breathing and rocket engines.

While the engine is still in the design phase, the firm plans to see three main test phases stretching into the 2020s.

It’s hoped that the first test will take place within the next 12-15 months, the CEO tells AWN, with a focus on the heat exchanger and the core.

Rather than aiming for a demonstrator that can achieve more than 150,000 lb thrust, the firm will instead now target an engine size capable of roughly 44,000 lb thrust. 

Pictured, an artist's impression of the Lapcat A2 craft flying at Mach 5

Here, a concept of the Skylon spaceplane using the engine is shown. But now, Reaction Engines Ltd has scaled back its design for the Sabre engine to bring about a demonstrator that is more affordable and better suited to early applications, including a potential X-plane. dailymail

Then, the team will move on to the integrated engine tests in 2020-2021.

The system will undergo sea-level testing, and researchers will simulate high velocity air by heating the air flow. And, they will run wind tunnel tests to assess flow conditions.

In the third phase, the firm is looking toward concepts of an X-plane or flight demonstration aircraft to put it to the test.

The core will eventually be tested in the UK, meaning Reaction will need to build a test facility with a hydrogen/air breathing preburner. 

In July, it was announced that the European Space Agency has invested $11 million toward the development of the engine.

Along with this, Reaction Engines announced that it had secured over $66 million in funding from the British government, with more than $55 million from the UK Space Agency, and the ESA contribution acting as the final piece.

At the moment, rockets have to carry liquid oxygen and liquid hydrogen to power them and the cost of carrying this heavy fuel is expensive.

The new engine creates its own liquid oxygen by cooling air entering the engine from 1,000°C to minus 150°C in a hundredth of a second – six times faster than the blink of an eye – without creating ice blockages.

This allows the engine to run safely at much higher power than is currently possible, without the risk that it will overheat and break apart. dailymail

Lapcat A2 craft flying at Mach 5

The hidden horrors of Nagasaki: Confiscated photographs of the devastating effects of America's atomic bomb

The collection of poignant images taken by Yosuke Yamahata, a Japanese military photographer, show the flattened landscape, mass death and desperate plight of survivors immediately following the nuclear blast in Nagasaki, Japan

Taken 12 hours after the blast – are revealed 70 years on

Haunting photographs taken the day after the Japanese city of Nagasaki was hit with an atomic bomb have emerged 70 years after being confiscated by American forces.

The collection of poignant images taken by Yosuke Yamahata, a Japanese military photographer, show the flattened landscape, mass death and desperate plight of survivors immediately following the nuclear blast.

Yamahata was tasked with documenting the destruction for propaganda purposes and arrived at the scene just 12 hours later.

 

Haunting photographs taken the day after the Japanese city of Nagasaki 

was hit with an atomic bomb have emerged 70 years after being 

confiscated by American forces

Photographer Yosuke Yamahata, pictured in Shanghai in 1943 here, took the iconic snaps

Supreme Commander Dwight Eisenhower (left), who later became president, shaking hands with General MacArthur, who played a prominent role in the war against Japan. The photo, taken in 1946, shows a rare moment of tenderness between the two men, who are widely known to have disliked each other later on

Supreme Commander Eisenhower carrying out inspection in the historic snaps, which have not seen the light of day for 70 years

Yamahata was tasked with documenting the destruction for propaganda purposes and arrived at the scene just 12 hours later 

His haunting photographs encapsulated the devastation left behind by the atomic bomb

They were requisitioned following a direct order from General Douglas MacArthur to seize and destroy any such pictures to shield the true scale of the carnage from the public back at home

The full album contains 24 photographs developed from Yamahata's original negatives

Some of his photographs, which became iconic after featuring in a 1952 edition of Life Magazine, are considered the most complete record of the attack's aftermath. However some were confiscated by an unidentified US military policeman in the months that followed, never to be seen again until now

Some of his photographs, which became iconic after featuring in a 1952 edition of Life Magazine, are considered the most complete record of the attack's aftermath.

However some were confiscated by an unidentified US military policeman in the months that followed, never to be seen again until now.

They were requisitioned following a direct order from General Douglas MacArthur to seize and destroy any such pictures to shield the true scale of the carnage from the public back at home.

But the military policeman kept hold of the images, which have since been acquired by a collector, and are now being sold in the US by RR Auction with an estimate of £38,000.

The full album contains 24 photographs developed from Yamahata's original negatives.

And of these 12 were never published because, unbeknownst to Yamahata at the time, they were taken using a defective shutter that created small black dots on the finished product and thus made them surplus to Yamahata's requirements.

The lot also contains more than 200 photographs captured by the military policeman, including candid snaps of General MacArthur and President Dwight Eisenhower greeting troops and a personal account from Yamahata about the horrors he witnessed.

The unidentified US military policeman who confiscated the photos 

 

An eerie picture of two Nagasaki survivors

In this article, published by a Japanese magazine in 1962, he says: 'I tried climbing up onto a small hill to look - all around, the city burned with what looked like little elf-fires, and the sky was blue and full of stars.

'It was a strangely beautiful scene.

'On my way, I began to hear the voices of dying people calling out, 'Water, give me water, please'.

'I stumbled over things in my path, such as the belly of a horse that had been charred to death.

'At 2am in the morning it was pitch dark so I couldn't see anything. But after sunrise I saw that the skin had been exposed was a reddish brownish colour.

'The victims faces were horribly inflamed. They brought to mind 'watermelon ghosts'. Even their eyes were burned.

'The blacks of the eyelids were red and swollen as though they had been turned inside out, and the edges of the eyes were yellow like the fat of a chicken.

'Blinded people groped their way forward with both hands extended in front of them.'

Many of Yamahata's photographs were used in Japanese publications just a few weeks after the bombing.

He died aged 48 in 1966 of cancer, which is believed to have been caused by extensive exposure to radiation.

Soviet footage of A-bomb aftermath emerges

 

Many of Yamahata's photographs were used in Japanese publications 

just a few weeks after the bombing

He died aged 48 in 1966 of cancer, which is believed to have been caused by extensive exposure to radiation

In an article published by a Japanese magazine in 1962, the photographer said: 'I tried climbing up onto a small hill to look - all around, the city burned with what looked like little elf-fires, and the sky was blue and full of stars.'

 

Many of Yamahata's photographs were used in Japanese publications just 

a few weeks after the bombing

 

The US's nuclear strike against Nagasaki on August 9, 1945, came three

days after a similar bomb was dropped on Hiroshima. dailymail

Robert Livingston, RR Auction's executive vice president, said: 'When you hold this album in your hands you get a feel for how powerful these images are.

'These are the originals, not retouched, not fixed and have rarely been seen in public before.

'They show us just how much of a devastating weapon this was, and what the atomic bomb bomb did to the human body is pretty gruesome and disturbing to see.'

The US's nuclear strike against Nagasaki on August 9, 1945, came three days after a similar bomb was dropped on Hiroshima.

These attacks resulted in the deaths of around 120,000 people.

Japan surrendered six days later.

The lot is being sold on September 25. dailymail

US atomic bomb strike against Japan on August, 1945

Test of cannon for T-50 PAK-FA

T-50 PAK FA testing its new 9-A1-4071K cannon

Meet the B-21 Raider

Air Force Secretary Deborah Lee James announced the B-21 bomber will be called the B-21 Raider. The name represents the historically important role the new long-range stealth bomber will lead for the next 50 years.

The Air Force’s long-range strike bomber that will replace the antique B-52's developed during the cold war has officially been named the B-21 Raider. 

The all-black plane has a distinctive, zigzagging shape and a low profile designed to make it hard to spot on radar.

It is 'projected to enter service in the mid-2020s, building to a fleet of 100 aircraft.' 

The US Air Force on Friday unveiled the first image of its next-generation bomber that will replace antique B-52s first developed during the Cold War. The all-black plane has a distinctive, zigzagging shape and a low profile designed to make it hard to spot on radar 

The name was ultimately selected by James and Air Force Chief of Staff Gen. Dave Goldfein after a panel composed of staff from AFGSC and Headquarters Air Force determined the top-ranked selections from more than 2,100 unique naming submissions. 

'The B-21 is intended to operate in both conventional and nuclear roles, with the capability of penetrating and surviving in advanced air defense environments,' The Air Force said.

'It will be capable of operation by an onboard crew or piloted remotely.' 

Earlier this year the US Air Force unveiled the first image of its new stealth bomber when Air Force Secretary Deborah Lee James provided the world with the first glimpse of the project using an artist's rendering.

The rendering bears more than a passing resemblance to the Air Force's B-2 bomber, which is also made by Northrop Grumman. 

However the new document reveals it may not be that accurate.

'The released rendering shows a flying-wing design not dissimilar to the B-2, although simpler in shape. 

'It resembles early proposed designs that later evolved into the B-2.'

The report also outlines the craft,s unmanned capabilities, saying 'Initial B-21s will be manned, with unmanned operation possible several years after initial operational capability (IOC).'

Nuclear qualification will also take two years or so after IOC, the report says.

It is designed to be launch from the continental US and deliver airstrikes on any location in the world. 

At an earlier event in Orlando, James revealed the plane - previously known as the Long Range Strike Bomber - would be called the B-21 until a new name has been agreed on, and she invited air crews to help.

The designation B-21 recognises the aircraft as the military’s first bomber of the 21st century.

'This aircraft represents the future for our Airmen, and (their) voice is important to this process,' James told the Air Force Association's Air Warfare Symposium.

The new bomber is a high Air Force priority because the oldest ones in its fleet — the venerable B-52s — have far outlived their expected service life. Even the newest — the B-2 stealth bombers (pictured) — having been flying for more than two decades

The program has been shrouded in secrecy since its inception for fear of revealing military secrets to potential enemies.

The military also wanted to avoid giving the losing bidders any details before their formal protest was rejected last week.

The Air Force wants 100 of the warplanes, which will replace the ageing B-52s and the B-1 bombers that first saw action in the 1980s.

Industry news reports say that while the new plane's specific capabilities are highly secret, it likely will be equipped with high-tech communications gear and other electronics that would allow it to perform a variety of missions, not just dropping bombs. 

The new bomber is a high Air Force priority because the oldest ones in its fleet — the venerable B-52s — have far outlived their expected service life.

Even the newest — the B-2 stealth bombers — having been flying for more than two decades. 

A third bomber, the B-1, is used heavily for conventional strikes, but no longer is certified for nuclear missions.

The Pentagon in October announced Northrop as the winner of the contract to build the bomber in a decades-long program that will likely end up costing in excess of $100 billion. 

But work on the new plane was delayed for months while federal auditors reviewed a protest by Boeing and its key supplier, Lockheed Martin.

Boeing has now told senior U.S. Air Force leaders that it will not take further legal action challenging the contract, Reuters said, citing two sources familiar with the decision.

The B-21 bomber will replace Air Force B-52 bombers, which have been flying for more than half a century. Pictured is the B-52 Stratofortress entered service in the 1950s. dailymail

A pilot and co-pilot of a B-52 bomber in an image taken in 1972. These bombers are not out of date at the Air Force is looking to replace them with 100 B-21 bombers

The Air Force, under pressure from lawmakers and retired Air Force officers, has promised to release more information about the new plane in March.

And the program has now survived the legal protest process, it still faces hurdles in Congress.

Senate Armed Services Committee Chairman John McCain on Thursday said he would block the Air Force's use of a cost-plus type of contract for the long-range bomber since it holds the government responsible for cost overruns.

The Air Force says that only the engineering and development phase of the program, valued at $21.4 billion, is structured as a cost-plus contract with incentive fees.

Analysts say the program will be worth around $80 billion in total, providing a boon to Northrop and its key suppliers, but the Air Force has said only that it expects to pay $511 million per plane.

John Michael Loh, a retired four-star U.S. Air Force general, has urged the Air Force to name Northrop's suppliers to shore up support in Congress, and avoid a re-run of the B-2 bomber program, which was scaled back from 132 planes to just 21, which drove the price of each plane sharply higher. 

THE HISTORY OF THE B-2 BOMBER 

The first operational aircraft, christened Spirit of Missouri, was delivered to Whiteman Air Force Base, Missouri, where the fleet is based, on 17 December 1993.

Twenty one aircraft were built in the original B-2 fleet. 

The B-2 has demonstrated its capabilities in several combat scenarios, including Operation Allied Force in Kosovo; Operation Enduring Freedom in Afghanistan, Operation Iraqi Freedom, and most recently, in Libya, during Operation Odyssey Dawn.

The B-2 is the only U.S. aircraft that combines long range, large payload and stealth in a single platform, giving it the ability to project air power anywhere in the world. 

It can fly 6,000 nautical miles unrefueled and 10,000 nautical miles with just one aerial refueling.

The Air Force said it will buy 100 of the new bombers at a newly calculated average cost of $511 million each. Pictured is the a B-2A bomber from the 509th Bomb Wing at Whiteman Air Force Base in Missouri. dailymail

With its ability to carry more than 20 tons of conventional and nuclear ordnance and deliver it precisely under any weather conditions, the B-2 also has the ability to change the outcome of a conflict with a single mission. 

Today, the fleet consists of 20 aircraft, following the loss, in February 2008, of the Spirit of Kansas, which crashed while taking off from Andersen Air Force Base, Guam, the only such incident in the B-2's more than 20 years of operation. 

Nineteen B-2s are currently based at Whiteman Air Force Base, Mo., home of the 509th Bomb Wing, while one aircraft is assigned to flight testing at Edwards AFB, California to validate software and weapon systems upgrades.

The idea is that the latest B-21 bomber, which is still on the drawing board will replace Air Force B-52 bombers, which have been flying for more than half a century.

It will also eventually the B-1 bombers, when they retire sometime in the 2040s.

Read more:

• Report on Air Force B-21 Long Range Strike Bomber

DARPA creating disappearing drones