Pentagon plans ’flying submarine’
By Tom Chivers | Telegraph.co.uk
Pentagon researchers are attempting to develop a military vehicle which can travel underwater like a submarine before bursting out of the waves and flying like an aeroplane.
The manta ray-like flying submarine from The Incredibles. Photo: PIXAR
The Defense Advanced Research Projects Agency (DARPA), the US military science and technology department, has set about creating an aircraft that can fly low over the water until near its target before disappearing under the sea to avoid detection.
It would then creep closer in submarine form before attacking its target, probably a ship or coastal installation, and fly home.
New Scientist reports that the project, which has been in development since 2008, has reached design proposal stage, and several outside developers have submitted designs. DARPA could start allocating funding to developers in as little as a year.
While the principles of hydrodynamic and aerodynamic flight are similar, the technological challenges are profound. Aircraft need to be as light as possible, so that they can use a minimum of power to get airborne, while submarines need to be dense and strong to withstand water pressure. Heavier-than-air aircraft get their lift from airflow over their wings - submarines simply pump water in and out to change their buoyancy.
Lockheed Martin’s Skunk Works, famed for the U-2 and Blackbird spy planes that flew higher than anything else in the world in their day, is trying for a different altitude record: an airplane that starts and ends its mission 150 feet underwater. The Cormorant, a stealthy, jet-powered, autonomous aircraft that could be outfitted with either short-range weapons or surveillance equipment, is designed to launch out of the Trident missile tubes in some of the U.S. Navy’s gigantic Cold War era Ohio-class submarines. Source
One method of getting around the latter problem is to design a submarine that is lighter than water, but - like an upside-down aeroplane - uses lift generated by its wings to force it away from the surface. Then, after surfacing, the wings’ "angle of attack" would be changed to generate upwards lift instead, allowing it to fly.
Graham Hawkes, a submarine designer, believes that modern lightweight carbon fibre composites could be used to build a craft that is both strong enough and light enough to fly above and below the water. He has already designed and built a submersible craft called the "Super Falcon" which uses stubby wings to "fly" down to 300 metres. He says that if it were given jet engines and larger wings, it could fly at up to 900kph (560mph) in the air, while still being capable of underwater travel at around 18kph (11mph). At these speeds, the behaviour of water and air over the control surfaces is similar. "Think about it as flying under water," says Mr Hawkes. "It can be done. It just needs a lot of work."
One problem could be overcome in a dramatic fashion - in order to get the wings to start generating downward lift, the craft would have to get underwater; but a lighter-than-water vessel would struggle to do so. Mr Hawkes suggests copying birds: "You might have to put the nose down and literally dive, smack, into the water. It would certainly be spectacular."
There are a variety of other design problems to overcome. Ordinary batteries capable of giving the craft a 44km (28 mile) range - as specified by DARPA - would weigh more than the rest of the vessel, but running it on ordinary fuel would require a supply of air, meaning a snorkel and a maximum depth of just a few meters.
Also, jet engines - which run at several hundred degrees celsius - would most likely explode from the sudden change in temperature if they were rapidly submerged after airborne use, but piston engines would not survive being immersed in water. Jim McKenna, an engineer at the UK Civil Aviation Authority, says: "You can’t let cold seawater get at a hot engine because the thermal shock will blow it apart." The Pentagon’s dream of a flying submarine is still some way away yet.
Article from: Telegraph.co.uk
Russian concept flying sub.
’Flying car’ gets go-ahead
Secret X-37B Space Plane Spotted by Amateur Skywatchers
DARPA: Hacking Nature to Create Weapons of the Gods
Science fiction inspires DARPA weapon
DARPA seeks $750m for hypersonic roboplane testbed
Flying Submarine - Wikipedia
Possible to build a modern submarine aircraft carrier?
The Navy’s Swimming Spy Plane
Latest News from our Front Page
Netanyahu ‘spat in our face,’ White House officials said to say
The White House’s outrage over Prime Minister Benjamin Netanyahu’s plan to speak before Congress in March — a move he failed to coordinate with the administration — began to seep through the diplomatic cracks on Friday, with officials telling Haaretz the Israeli leader had “spat” in President Barack Obama’s face.
“We thought we’ve seen everything,” the newspaper quoted an unnamed senior ...
The Return of the Protected Jewish Minority in Europe
Contrary to the standard narratives of Jewish ‘history,’ a prominent feature of the historical presence of Jews in Europe has been their protected status. The common context for this status was a symbiotic relationship between the Jewish minority and exploitative or tyrannical elites. As agents of the feared elite, as foreigners, as exploiters in their own right, and with interests ...
Truth Revealed: McCain’s ‘Moderate Rebels’ in Syria ARE ISIS
Poor John McCain and Lindsey Graham, Washington’s real first couple. They only want to arm the ‘moderate opposition’ in Syria. Three years on, how come their master plan isn’t working, while ISIS has grown so strong?
Despite what media lauded as, “the largest demonstration in France’s history – bigger than liberation at the end of WWII!” (can you rightly compare the ...
European 'No-Go' Zones: Fact or Fiction?
Comment: This is an interesting article about Muslim no-go Zones in Europe. However, keep in mind that the focus in this piece is not addressing the root of the problem, but a symptom of the problem. Yes, there is an issue with large Islamic colonies in Europe today, but the article mentions nothing about who has changed the immigration laws ...
A Radical Traditionalist Critique of the Anti-Islam Movement
The terrorist attack against the staff at the magazine Charlie Hebdo in Paris shook an entire continent. In a European climate in which protests against the perceived Islamization of our civilizational sphere becomes ever more widespread, showing in increased electoral success for moderate nationalist parties, as well as in expressions of mass public dissent, the recent resurgence of violent Islamic ...
|More News » |