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Soldier launching a Raven
The Air Force and Army continue to rely heavily on UAVs

Unmanned aerial vehicles (UAVs) remain a reliable staple in the U.S. Military's winged arsenal. The use of remote drones not only puts less expensive machinery in the air, but it also takes American pilots out of harm's way.

According to the Associated Press, the Air Force's use of UAVs doubled between the months of January and October. During that same time period, the Air Force’s use of the Predator drone increased from 2,000 hours per month to 4,300 hours per month.

The Army also saw its UAV usage increase during the past year. The Army's 361 unmanned Ravens, Shadows and Hunters combined for a total of over 300,000 hours of service through the first ten months of 2007. The Raven, the Army's air surveillance workhorse, is expected to rack up more than 300,000 hours of flying time during 2008 alone -- more than double the figure from 2007.

"I think right now the demand for the capability that the unmanned system provides is only increasing," remarked Army Col. Bob Quackenbush, deputy director for Army Aviation. "Even as the surge ends, I suspect the deployment of the unmanned systems will not go down, particularly for larger systems."

"The demand far exceeds all of the Defense Department's ability to provide (these) assets," added Air Force Lt. Col. Larry Gurgainous of the Air Force's unmanned aircraft task force. "And as we buy and field more systems, you will see it continue to go up."

UAVs saw extensive action in both Afghanistan and Iraq during 2007. A Hunter MQ-5B/C UAV dropped a bomb on two suspected enemy insurgents in early September. The Hunter MQ-5B/C has the ability to loiter in the air for 15 hours and can carry up to 260 pounds of ammunition.

Boeing also gave UAVs a boost with the announcement of the High Altitude Long Endurance (HALE) UAV. The HALE uses a hydrogen-based Duratec 23 four-cylinder engine to power the aircraft to 65,000 feet and stay aloft for up to one week.



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By FastLaneTX on 1/3/2008 1:23:00 PM , Rating: 2
All ICEs produce NOx and SOx if they use atmospheric air instead of pure O2. An ICE doesn't just burn the fuel; it also burns (some of) the non-oxygen molecules in the air it takes in -- and N2 molecules far outnumber O2 molecules.

The compression and heat of that air in the ICE's cylinders causes those other gases to react with some of the O2 to form NOx, SOx, etc. The particular fuel that the ICE is burning has little effect on this problem, since the fuel is not the source of those gases.


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