Tag Archives: base

Jet travels more than 13,000 mph (Mach 20) thanks to sleek aerodynamic systems

It’s amazing that this Hypersonic jet was able to travel more than 13,000 mph with heats of over 3,500 degrees.

During flight it experienced shockwaves, 100 times more powerful than expected, which caused it to spin. It then righted itself and flew for twice as long before technicians finally aborted the mission.

The full story:

In August the Pentagon’s research arm, known as DARPA, carried out a test flight of an experimental aircraft capable of traveling at 20 times the speed of sound.

The arrowhead-shaped unmanned aircraft, dubbed Falcon Hypersonic Technology Vehicle 2, blasted off from Vandenberg Air Force Base, northwest of Santa Barbara, into the upper reaches of the Earth’s atmosphere…then glided above the Pacific at 20 times the speed of sound, or Mach 20.

The plan was for the Falcon to speed westward for about 30 minutes before plunging into the ocean near Kwajalein Atoll, about 4,000 miles from Vandenberg.

But it was ended about nine minutes into flight for unknown reasons. The launch had received worldwide attention and much fanfare, but officials didn’t provide much information on why the launch failed.

via LA Times

 

Then last week, DARPA said in a statement:

The flight successfully demonstrated stable aerodynamically-controlled flight at speeds up to Mach 20 for nearly three minutes. Approximately nine minutes into the test flight, the vehicle experienced a series of shocks culminating in an anomaly, which prompted the autonomous flight safety system to use the vehicle’s aerodynamic systems to make a controlled descent and splashdown into the ocean.

“The initial shockwave disturbances experienced during second flight, from which the vehicle was able to recover and continue controlled flight, exceeded by more than 100 times what the vehicle was designed to withstand,” said DARPA Acting Director, Kaigham J. Gabriel. “That’s a major validation that we’re advancing our understanding of aerodynamic control for hypersonic flight.”

…larger than anticipated portions of the vehicle’s skin peeled from the aerostructure. The resulting gaps created strong, impulsive shock waves around the vehicle as it travelled nearly 13,000 miles per hour, causing the vehicle to roll abruptly. Based on knowledge gained from the first flight in 2010 and incorporated into the second flight, the vehicle’s aerodynamic stability allowed it to right itself successfully after several shockwave-induced rolls. Eventually, however, the severity of the continued disturbances finally exceeded the vehicle’s ability to recover.

via DARPA

Hypersonic Technology Vehicle (HTV-2)

 

The Army’s secret Arctic underground nuclear base in Greenland

No, this picture doesn’t show a black and white image of the rebel base on the ice planet Hoth. It’s part of a semi-secret, nuclear-powered U.S. Army base that was built under the Greenland ice cap only 800 miles from the North Pole. The base was officially built to conduct scientific research but the real reason was apparently to test out the feasibility of burying nuclear missiles below the ice under an effort known as Project Iceworm.

Remember, Greenland is way closer to Russia than the ICBM fields located in the continental U.S. Rumor has it that the Danish government had no idea that the U.S. was considering installing nuclear missiles on Greenland.

The base was massive, described by some as an underground city, and consisted of 21 steel-arch covered trenches; the longest of which was 1,100-feet long, 26-feet wide and 26-feet high. These tunnels contained numerous prefabricated buildings that were up to 76-feet long. The base was powered by a portable PM-2A nuclear reactor that produced two megawatts of power for the facility.

“The camp was staffed year round, with population peaking at nearly 200 over the summer months.”

via Defense Tech

The base makes sense if you look at maps with the Arctic Circle at the center, Russia is a direct shot over the ice.

 

// Thx to Dave Schroeder

China’s meteoric rise makes it the second largest app economy

Flurry recently quantified China’s meteoric adoption of iOS and Android applications. While China ranked 10th in application sessions at the beginning of 2011, it finished the year in 2nd place, only behind the United States. With its large population and rapidly emerging middle class, adoption of apps vaulted China into the position of world’s 2nd largest app economy.

This report reveals that, for the first time ever, China now leads in new smart device adoption (iOS and Android smartphones and tablets).

With China now activating more devices per month than the U.S., this means that the gap is closing between the two countries in terms of installed base.

Ten fastest growing countries in terms of app sessions:

No matter how we slice it, the application market continues to grow at unprecedented rates, and increasingly across more borders. With smart devices adoption rates more than four times greater than those witnessed during the 1980s PC revolution and twice as great as those seen during the 1990s Internet Boom, no other consumer technology has been more accessible than smart device application software. It’s literally taking over the world.

via The Flurry Blog