Stealth Military Planes - Due to restricted access, it is unknown how many engines were mounted behind the B-21's intake. The B-2 has four General Electric turbofan engines, while the B-21's engines are supplied by Pratt & Whitney. Shorter wings and fewer wheels in the landing gear bogies along with a reduced footprint mean weight savings, which translates into an improved performance envelope with greater endurance/range.
The B-21 Raider is known to cost $692 million per aircraft. Over the next three decades, the program is expected to cost US taxpayers $203 billion, according to a Time exclusive (opens in new tab). The Air Force says it wants an inventory of at least 100 (opens in new tab) B-21 Raiders.
Stealth Military Planes
Source: upload.wikimedia.org
Also known as the Lockheed F-117 Nighthawk, this American aircraft was almost a secret. It first flew in 1981 and was officially inducted into the military two years later. Also known as the "stealth fighter", the Nighthawk is one of the scariest military aircraft currently in operation.
Honoring The Past
In the 1980s, the plane's existence was kept secret and companies tried to guess its specifications, sometimes building inaccurate models. The Nighthawk is designed to be reliable, easy to handle, and invisible to enemy eyes despite its insane appearance.
"The number of ice crystals depends on the number of soot particles. If we reduce them, it reduces the wake," says Dr Mark Stettler, an expert on transport emissions at University College London. The Air Force and Northrop Grumman unveiled the B-21 Raider in dramatic fashion during a live broadcast, with the plane covered in a massive shroud that was illuminated by blue light as it emerged from the bomber hangar.
Aircraft lighting hid many parts of the bomber in shadow during the ceremony, but the futuristic, saucer-like design was visible from as far away as the audience would allow. Researchers blew sulfur dioxide directly into the air intake, but this was not enough.
Dr Roger Teh, who is researching the impact of aviation on climate change at Imperial College London, says that large increases in sulfur will not have the desired effect. "Adding large amounts of sulfur resulted in very little reduction in trail formation; and could have unintended consequences," says Teoh. Teoh notes that new types of combustion engines dramatically reduce the amount of soot in the exhaust by ensuring that the fuel is completely burned before it reaches the exhaust. "The latest ICAO Aircraft Emissions
Back To Basics
Databank, a publicly available data set, shows that different types of combustors can significantly reduce the number of soot particles by up to four orders of magnitude," says Teoh. This represents a factor of ten thousand, enough to eliminate visible contrast. To evade detection in the infrared spectrum, first-generation stealth aircraft used large, heat-
Source: cdn.i-scmp.com
Production did not have afterburner engines, so they could not fly supersonic. Additionally, the shapes and structures suitable for stealth aircraft often differed from aerodynamic and operational requirements. are hot. Since all weapons had to be carried internally, ordnance loads were lower than equivalent conventional aircraft, and sophisticated artificial stabilization and control systems were required to give the stealth aircraft satisfactory flight characteristics.
Unlike the fighter, the B-2 had no vertical fin stabilizers, instead relying on flaps on the trailing edge of its notched wing to control roll, pitch and yaw. A second-generation stealth aircraft, the US Air Force's F-22 Raptor, first flown in 1997, is capable of "supercruise", reaching supersonic speeds without afterburn.
The name "Raider" was submitted by Airmen from the 337th Test and Evaluation Squadron at Eglin Air Force Base, Florida, and beat out more than 2,000 suggestions. It refers to the April 1942 Doolittle Raid, during which 80 airmen flew a retaliatory mission to bomb Japan just months after the attack on Pearl Harbor.
The First Operational Craft
Despite Defense Secretary Robert Gates' reluctance to deploy to Iraq, the F-22s later intercepted an Iranian F-4 Phantom II in 2013, protecting an MQ-1 Predator drone off the Iranian coast. In 2014-15, F-22s were deployed to Syria, dropping 270 bombs in 60 different locations and attacking pro-Assad forces in 2018.
Military aviation blog The War Zone (opens in a new tab) points out that no seams were visible on the aircraft shown at the unveiling ceremony, possibly indicating that B-21 production involved sophisticated manufacturing techniques and advanced new materials that enable sensors, communications.
Aeronautical data systems and antennas are integrated directly into the airframe (the body of the aircraft apart from its power and propulsion systems). This involves a massive revolution in terms of low visibility (stealth), making it even more difficult to detect aircraft with radars and other sensors.
A change in elevation works because contrails form only under specific conditions of temperature and humidity. German scientist Ernst Smith took the first steps towards a scientific understanding of the process in 1941, and in 1953 Herbert Appleman of the American Meteorological Society developed a precise formula for the formation of contrails.
Source: i.pinimg.com
Stealth Technology
The so-called Smith-Appleman criterion can be expressed perfectly as a graph of temperature and humidity: to avoid contrast, avoid the area drawn in the middle of the graph. The bottom line is that we are looking at the controls, which are taking us to the plane, because they want us to.
That line in the sky is a deliberate pointer. Why it should be and what is actually hidden is another mystery. Another Lockheed design, the F-35 Lightning is a single-seat, single-engine, all-weather stealth multirole fighter jet.
It looks as complicated as the construction and concept of this aircraft. Indeed, the program drew scrutiny and criticism for its size, complexity, rising costs and long-delayed deliveries. Finally, the F-35 entered the US military fleet in 2015 and was used by Israeli forces for the first time in combat three years later.
The service named Ellsworth Air Force Base, South Dakota, home of the B-21 and headquarters of the aircraft's training program. Each aircraft cost an estimated $550 million in 2010; After adjusting for inflation this year, the cost of each aircraft, including training materials, support equipment and other bomber components, is $692 million, Stefanek said.
A Greener Reason To Prevent Contrails
The Air Force plans to buy at least 100 stealth bombers. The acid injection system was successful in making small drones invisible, but was not popular for other reasons. Chlorosulfonic acid is extremely corrosive and can damage engines, shortening their useful life in flight.
It is highly toxic and hazardous to ground equipment. But pending further developments, the US military and Sikorsky had plans to create a stealth-capable version since 1978. There is no official word on the existence of a stealth Black Hawk, but it was responsible for killing Osama during the 2011 attack.
Bin Laden, the Black Hawk crashed and revealed an interesting fact. From France to Israel and back to Europe with this secret missile corvette. The K32 is a Swedish Visby-class corvette, meaning the ship is a small frigate, adopted by the Swedish military to emphasize low visibility, radar cross-section and infrared signature.
Source: hips.hearstapps.com
Historically, the Department of Defense has not had luck with joint programs, but greater "jointness" between the services, more advanced production techniques, and more carefully refined logistics procedures make a shared warfighter worthwhile. All parties understand that the winner of the competition will enjoy great export success as many air forces around the world require the fifth generation fighter.
Stealth Technology Still Under Wraps
In short, it's the biggest deal on the defense industry's horizon since the Cold War. Boeing and Lockheed Martin each won contracts to develop two demonstrators. This method was initially used for military aircraft, but has found its way into many other military vehicles such as tanks or ships.
Tanks are among the latest vehicles to receive stealth capabilities, Popular Mechanics reports, and face detection problems because "millimeter wave radars can detect minute temperature changes through fog and infrared sensors." The B-21 was designed with that competition in mind.
Summarizing Northrop Grumman's new bomber's capabilities, adversaries "continue to invest in and develop advanced weapons," the B-21 U.S. Penetrate USA enemy air defenses and hit targets "anywhere in the world". Although things don't always go according to plan.
Throughout the development of secret military aircraft, information can be obtained through leaks, whether intentional or not. Sometimes a necessary distraction from the true intentions and sometimes a complete coincidence without the intention to occur, these 10 military aircraft were intended to be kept secret, but were revealed to the public through leaked information: manufactured by the Chengdu Aircraft Corporation for the forces of the Chinese Navy, the J-20 third stealth fighter and not built for the United States Air Force.
Of Metal And Mirrors
It's no accident: A 2009 Wall Street Journal report said the plan was compromised. The Federation of American Scientists wrote in 2016 that its explosive yield was up to 50 kilotons, or the equivalent of 50,000 tons of TNT.
It is far from the most powerful weapon in the US arsenal, but it is several times larger than the bomb dropped on Hiroshima, Japan, during World War II. The United States government announced the existence of the Stealth Program in 1980, designed to produce defense aircraft capable of radar detection at normal combat ranges.
Source: thumbs.dreamstime.com
Attack fighter, entered service in 1983. The second was the Northrop B-2 Spirit strategic bomber, which first flew in 1989. Both aircraft have unconventional shapes designed primarily to reduce radar reflectivity. The B-2 had a flying wing design that was slightly longer than the fighter, but it gave the B-52 a wingspan, while the F-117A had a shorter, pyramid-shaped fuselage and pointed wings.
Officials of the US Air Force and aerospace company Northrop Grumman unveiled the newest aircraft in the US fleet late Friday (Dec. 2) in a ceremony broadcast live on the Internet from Edwards Air Force Base in California.
Airborne Early Warning
The new bomber, built by Northrop Grumman, will become the backbone of the Air Force's bomber fleet after entering service within a few years. It offers a first look at next-generation aerospace capabilities that will be common in the coming decades.
A toy? A submarine? Thumbnail? Despite being a military vehicle, the Mark 8 seal is small. According to the military website, the Mark 8 is "designed for specialized underwater operations, including direct action, hydrographic reconnaissance and insertion/extraction of seals."
ಪ್ಲ್ಯಾಸ್ಟಿಕ್ ಬಲವರ್ಧಿತ ಫೈಬರ್ಗ್ಲಾಸ್ ಬದಲಿಗೆ ಅಲ್ಯೂಮಿನಿಯಂನಿಂದ ಇದನ್ನು ನಿರ್ಮಿಸಲಾಗಿದೆ, ಮತ್ತು ಹೆಚ್ಚಿನ ವೈಶಿಷ್ಟ್ಯಗಳು ಸುಮಾರು ಎಂಟರಿಂದ 12 ಗಂಟೆಗಳ ಪ್ರತಿರೋಧ, ಡೈವಿಂಗ್ ಗೇರ್ನೊಂದಿಗೆ 15 ರಿಂದ 18 nmi ಅಥವಾ ಇಲ್ಲದೆ 36 nmi. ರೇಡಾರ್ ಸಹಿಯನ್ನು ಕಡಿಮೆ ಮಾಡಲು ಆಕಾರವನ್ನು ನಿಯಂತ್ರಿಸುವ ಅಗತ್ಯವಿದೆ, ವಿಶೇಷವಾಗಿ ಲಂಬ ಕೋನಗಳು, ಚೂಪಾದ ವಕ್ರಾಕೃತಿಗಳು ಮತ್ತು ದೊಡ್ಡ ಮೇಲ್ಮೈಗಳನ್ನು ತಪ್ಪಿಸುವುದು.
ರೇಡಾರ್ ಶಕ್ತಿಯನ್ನು ಕಡಿಮೆ ಬಹಿರಂಗಪಡಿಸುವ ದಿಕ್ಕುಗಳಲ್ಲಿ ನಿರ್ದೇಶಿಸಲು, ರಹಸ್ಯ ವಿಮಾನದ ಬಾಹ್ಯ ಆಕಾರವು ದೊಡ್ಡ ತ್ರಿಜ್ಯದ ಸಂಕೀರ್ಣ ಬಾಗಿದ ಮೇಲ್ಮೈಗಳ ಸರಣಿಯಾಗಿದೆ (B-2 ನಂತೆ) ಅಥವಾ ಹೆಚ್ಚಿನ ಸಂಖ್ಯೆಯ ಸಣ್ಣ, ಎಚ್ಚರಿಕೆಯಿಂದ ಯೋಜಿಸಲಾಗಿದೆ. ಆಧಾರಿತ ವಿಮಾನಗಳು (F-117A ನಲ್ಲಿರುವಂತೆ). ಇಂಧನ ಮತ್ತು ಆರ್ಡನೆನ್ಸ್ ಅನ್ನು ಆಂತರಿಕವಾಗಿ ಸಾಗಿಸಲಾಯಿತು, ಮತ್ತು ಎಂಜಿನ್ ಒಳಹರಿವು ಮತ್ತು ನಿಷ್ಕಾಸಗಳನ್ನು ಫ್ಲಶ್ ಅಥವಾ ಮೇಲ್ಮೈಗೆ ಕಡಿಮೆ ಇರಿಸಲಾಗುತ್ತದೆ.
Detecting Contrails With Lasers
ರಾಡಾರ್ ಹೊರಸೂಸುವಿಕೆಯ ಪ್ರತಿಬಂಧವನ್ನು ತಪ್ಪಿಸಲು, ರಹಸ್ಯ ವಿಮಾನಗಳು ಜಡತ್ವ ಮಾರ್ಗದರ್ಶನ ಅಥವಾ ಇತರ ಹೊರಸೂಸುವಿಕೆ-ಮುಕ್ತ ಸಂಚರಣೆ ವ್ಯವಸ್ಥೆಗಳನ್ನು ಅವಲಂಬಿಸಬೇಕಾಗಿತ್ತು. ಇತರ ಸಾಧ್ಯತೆಗಳು ಲೇಸರ್ ರಾಡಾರ್ ಅನ್ನು ಒಳಗೊಂಡಿತ್ತು, ಇದು ತೆಳುವಾದ, ಬಹುತೇಕ ಪತ್ತೆಹಚ್ಚಲಾಗದ ಲೇಸರ್ ಕಿರಣದಿಂದ ಕ್ರಾಫ್ಟ್ನ ಮುಂದೆ ನೆಲವನ್ನು ಸ್ಕ್ಯಾನ್ ಮಾಡಿತು. ವಾಸ್ತವವಾಗಿ, B-21 ರ ವಿಸ್ತೃತ-ಶ್ರೇಣಿಯ ಸಾಮರ್ಥ್ಯವನ್ನು ರಕ್ಷಣಾ ಕಾರ್ಯದರ್ಶಿ ಲಾಯ್ಡ್ ಆಸ್ಟಿನ್ ಅವರ ಉಡಾವಣಾ ಹೇಳಿಕೆಗಳಲ್ಲಿ ಮೂಲಭೂತವಾಗಿ ದೃಢೀಕರಿಸಲಾಗಿದೆ.
Source: thumbs.dreamstime.com
ಈ ಕಾರ್ಯಕ್ಷಮತೆಯ ಲಾಭವು ಇಂಡೋ-ಪೆಸಿಫಿಕ್ ಥಿಯೇಟರ್ಗೆ ಸಂಬಂಧಿಸಿದ ದೂರದ ಕಾರ್ಯಾಚರಣೆಯ ನಮ್ಯತೆಗೆ ನಿರ್ಣಾಯಕವಾಗಿದೆ, ಇದು ಚೀನಾದ ಬಲದ ಆಧುನೀಕರಣ ಮತ್ತು ಸೇಬರ್-ರಾಟ್ಲಿಂಗ್ನಿಂದಾಗಿ ಹೆಚ್ಚುತ್ತಿರುವ ಕಾಳಜಿಯ ಪ್ರದೇಶವಾಗಿದೆ. ಕುತೂಹಲಕಾರಿಯಾಗಿ, ಏರ್ & ಸ್ಪೇಸ್ ಫೋರ್ಸಸ್ ನಿಯತಕಾಲಿಕವು ರಾಯಲ್ ಆಸ್ಟ್ರೇಲಿಯನ್ ವಾಯುಪಡೆಯ ಮುಖ್ಯಸ್ಥ ಏರ್ ಮಾರ್ಷಲ್ ರಾಬರ್ಟ್ ಚಿಪ್ಮ್ಯಾನ್ ಉಡಾವಣೆಯ ಸಮಯದಲ್ಲಿ ಪ್ರೇಕ್ಷಕರಲ್ಲಿದ್ದರು ಎಂದು ವರದಿ ಮಾಡಿದೆ.
ಮಾಜಿ ವಾಯುಪಡೆಯ ಕಾರ್ಯದರ್ಶಿ ಡೆಬೊರಾ ಲೀ ಜೇಮ್ಸ್ 2016 ರಲ್ಲಿ ಹೊಸ ಬಾಂಬರ್ನ ಹೆಸರನ್ನು ಘೋಷಿಸಿದರು, ವಿಶ್ವ ಸಮರ II ಮಿಷನ್ನಲ್ಲಿ ಹಾರಾಟ ನಡೆಸಿದ ಏರ್ಮೆನ್ಗಳಲ್ಲಿ ಒಬ್ಬರಾದ ನಿವೃತ್ತ ಲೆಫ್ಟಿನೆಂಟ್ ಕರ್ನಲ್ ರಿಚರ್ಡ್ ಕೋಲ್ ಅವರು 2019 ರಲ್ಲಿ ನಿಧನರಾದರು. ಸ್ಟೆಲ್ತ್ ತಂತ್ರಜ್ಞಾನವು ರಾಡಾರ್ನ ಸಹಿಯನ್ನು ನಾಟಕೀಯವಾಗಿ ಕಡಿಮೆ ಮಾಡಿದೆ ಮತ್ತು ವಿಮಾನದ ಅತಿಗೆಂಪು ಅವರ ಉಪಸ್ಥಿತಿಯ ವಾಯು ರಕ್ಷಣಾವನ್ನು ಎಚ್ಚರಿಸಿತು.
ಹಿಂದೆ, ದೀರ್ಘ-ಶ್ರೇಣಿಯ ರಾಡಾರ್ನಿಂದ ವಿಮಾನಗಳನ್ನು ಹೆಚ್ಚಾಗಿ ತೆಗೆದುಕೊಳ್ಳಲಾಗುತ್ತಿತ್ತು. ಇಂಜಿನಿಯರ್ಗಳು ವ್ಯತಿರಿಕ್ತತೆಯನ್ನು ಸಂಪೂರ್ಣವಾಗಿ ತೊಡೆದುಹಾಕಲು ವಿವಿಧ ತಂತ್ರಗಳನ್ನು ಅಭಿವೃದ್ಧಿಪಡಿಸಿದ್ದಾರೆ. ಹಾಗಾದರೆ ಕೆಲವು "ರಹಸ್ಯ" ವಿಮಾನಗಳು ಇನ್ನೂ ಅವುಗಳನ್ನು ಏಕೆ ಬಿಡುತ್ತವೆ? ಯುನೈಟೆಡ್ ಸ್ಟೇಟ್ಸ್ ಏರ್ ಫೋರ್ಸ್ಗಾಗಿ ಲಾಕ್ಹೀಡ್ ಮಾರ್ಟಿನ್ ತಯಾರಿಸಿದ, F-22 2005 ರಲ್ಲಿ ಸೇವೆಯನ್ನು ಪ್ರವೇಶಿಸಿತು. ಆ ಸಮಯದಲ್ಲಿ ಏರ್ ಫೋರ್ಸ್ ಯಾವುದೇ ತಿಳಿದಿರುವ ವಿಮಾನಕ್ಕೆ ಸಾಟಿಯಿಲ್ಲ ಎಂದು ಹೇಳಿಕೊಂಡಿತು.
Effective But Harmful Acid Injections
2007 ರಲ್ಲಿ, ಎಲ್ಮೆಂಡಾರ್ಫ್ ಏರ್ ಫೋರ್ಸ್ ಬೇಸ್ನಲ್ಲಿ ನೆಲೆಗೊಂಡಿದ್ದ ಎರಡು F-22 ಗಳು ರಷ್ಯಾದ ಬೇರ್-ಎಚ್ ಬಾಂಬರ್ಗಳನ್ನು ಪ್ರತಿಬಂಧಿಸಲು ಸ್ಕ್ರಾಂಬಲ್ ಮಾಡಲಾಯಿತು. ಇದನ್ನು ಮೊದಲು ಯುನೈಟೆಡ್ ಸ್ಟೇಟ್ಸ್ ಏರ್ ಫೋರ್ಸ್ಗಾಗಿ ಅಭಿವೃದ್ಧಿಪಡಿಸಲಾಗಿದ್ದರೂ, ಇಸ್ರೇಲಿ ವಾಯುಪಡೆಯು ಅವುಗಳನ್ನು ಯುದ್ಧದಲ್ಲಿ ಮೊದಲು ಬಳಸಿತು. 2018 ರಲ್ಲಿ, ಇರಾನ್ ತನ್ನ ಪ್ರಾಕ್ಸಿ ಯುದ್ಧದ ಭಾಗವಾಗಿ ಸಿರಿಯಾದಿಂದ 32 ರಾಕೆಟ್ಗಳನ್ನು ಉಡಾವಣೆ ಮಾಡಿದ ನಂತರ ಇಸ್ರೇಲಿ ಎಫ್ -35 ಗಳು ಸಿರಿಯಾದಲ್ಲಿ ಶಂಕಿತ ಇರಾನಿನ ಗುರಿಗಳನ್ನು ಹೊಡೆದವು.
F-35A ತನ್ನ ಸಂಪೂರ್ಣ ಪರಮಾಣು ಪ್ರಮಾಣೀಕರಣವನ್ನು ಯಾವಾಗ ಪಡೆಯುತ್ತದೆ ಎಂಬುದು ಇನ್ನೂ ಸ್ಪಷ್ಟವಾಗಿಲ್ಲ, ಅದು ತರಬೇತಿ ಶ್ರೇಣಿಗಳು ಮತ್ತು ಸಿಮ್ಯುಲೇಟೆಡ್ ಬಾಂಬ್ಗಳಿಂದ ನೈಜ-ಪ್ರಪಂಚದ ಯುದ್ಧಭೂಮಿಗಳಿಗೆ ಚಲಿಸಲು ಅನುವು ಮಾಡಿಕೊಡುತ್ತದೆ. ಆದರೆ ಅದು ಸಂಭವಿಸಿದಾಗ, ವಾಯುಪಡೆಯು ತನ್ನ ಫ್ಲೀಟ್ನಲ್ಲಿ ಪರಮಾಣು ಶಸ್ತ್ರಾಸ್ತ್ರಗಳನ್ನು ಸಾಗಿಸಬಲ್ಲ ಎರಡನೇ ರಹಸ್ಯ ವಿಮಾನವನ್ನು ಹೊಂದಿರುತ್ತದೆ. ಯುಎಸ್ ಪೂರ್ವನಿದರ್ಶನವನ್ನು ಮುರಿಯಲು ಸಿದ್ಧವಾಗಿದೆ ಮತ್ತು ಮಿತ್ರರಾಷ್ಟ್ರಗಳಿಗೆ ಸ್ಟೆಲ್ತ್ ಬಾಂಬರ್ಗಳನ್ನು ಮಾರಾಟ ಮಾಡಲು ಅಥವಾ ಗುತ್ತಿಗೆ ನೀಡಲು ಪ್ರಾರಂಭಿಸಬಹುದು ಎಂಬ ದೃಷ್ಟಿಕೋನಕ್ಕೆ ಇದು ವಿಶ್ವಾಸಾರ್ಹತೆಯನ್ನು ನೀಡುತ್ತದೆ.
ಯುದ್ಧಮಾಡುತ್ತಿರುವ ಚೀನಾದ ಬಗ್ಗೆ US ಕಳವಳವನ್ನು ಆಸ್ಟ್ರೇಲಿಯಾ ಹಂಚಿಕೊಳ್ಳುತ್ತದೆ ಮತ್ತು ಅಂತಹ ಮಾರಾಟ ಅಥವಾ ಗುತ್ತಿಗೆ ಒಪ್ಪಂದವು 2022 ರ ಸೆಪ್ಟೆಂಬರ್ ಮಧ್ಯದಲ್ಲಿ ಘೋಷಿಸಲಾದ AUKUS (ಆಸ್ಟ್ರೇಲಿಯಾ-UK-US) ಒಪ್ಪಂದಕ್ಕೆ ಸರಿಹೊಂದುತ್ತದೆ, ಅದರ ಅಡಿಯಲ್ಲಿ US ಮತ್ತು UK ಜಲಾಂತರ್ಗಾಮಿ ತಂತ್ರಜ್ಞಾನ ಪರಮಾಣುವನ್ನು ಯುನೈಟೆಡ್ ಸ್ಟೇಟ್ಸ್ನೊಂದಿಗೆ ಹಂಚಿಕೊಳ್ಳುತ್ತವೆ. ಆಸ್ಟ್ರೇಲಿಯನ್ನರು ಬಹುಶಃ ಕಾಕತಾಳೀಯವಲ್ಲ, ಬ್ರಿಟಿಷ್ ರಾಯಲ್ ಏರ್ ಫೋರ್ಸ್ನ ಏರ್ ಚೀಫ್ ಮಾರ್ಷಲ್ ಮೈಕ್ ವಿಗ್ಸ್ಟನ್ ಕೂಡ ಉಪಸ್ಥಿತರಿದ್ದರು.
ವಿದೇಶಿ ಮಾರಾಟದ ಸಾಧ್ಯತೆಯನ್ನು ಈ ಸರಣಿಯ ನಂತರದ ಭಾಗಗಳಲ್ಲಿ ಚರ್ಚಿಸಲಾಗಿದೆ.
new us stealth aircraft, us stealth fighter planes, american ww2 bomber planes, military stealth technology, new us military stealth planes, military stealth jets, us stealth planes, stealth fighter planes