BALAD AIR BASE, Iraq — The airplane is the size of a jet fighter, powered by a turboprop engine, able to fly at 300 mph and reach 50,000 feet. It's outfitted with infrared, laser and radar targeting, and with a ton and a half of guided bombs and missiles.

The Reaper is loaded, but there's no one aboard. Its pilot, as it bombs targets in Iraq, will sit at a video console 7,000 miles away in Nevada.

The arrival of these outsized U.S. "hunter-killer" drones, in aviation history's first robot attack squadron, will be a watershed moment even in an Iraq that has seen too many innovative ways to hunt and kill.

That moment is expected "soon," says the regional U.S. air commander. How soon? "We're still working that," said Lt. Gen. Gary North.

The Reaper's first combat deployment is expected in Afghanistan, and senior Air Force officers estimate it will land in Iraq sometime between this fall and next spring.

They look forward to it.

"With more Reapers, I could send manned airplanes home," North said.

The Air Force is building a 400,000-square-foot expansion of the concrete ramp area now used for Predator drones here at Balad, the biggest U.S. air base in Iraq, 50 miles north of Baghdad. That new staging area could be turned over to Reapers.

It's another sign that the Air Force is planning for an extended stay in Iraq, supporting Iraqi government forces in any continuing conflict, even if U.S. ground troops are drawn down in the coming years.

The estimated two dozen or more unmanned Predators now doing surveillance over Iraq, as the 46th Expeditionary Reconnaissance Squadron, have become mainstays of the U.S. war effort, offering round-the-clock airborne "eyes" watching over road convoys, tracking nighttime insurgent movements via infrared sensors, and occasionally unleashing one of their two Hellfire missiles on a target.

From about 36,000 flying hours in 2005, the Predators are expected to log 66,000 hours this year over Iraq and Afghanistan.

The Reaper, when compared with the 1995-vintage Predator, represents a major evolution of the unmanned aerial vehicle, or UAV.

At 5 tons gross weight, the Reaper is four times heavier than the Predator. Its size — 36 feet long, with a 66-foot wingspan — is comparable to the profile of the Air Force's workhorse A-10 attack plane. It can fly twice as fast and twice as high as the Predator. Most significantly, it carries many more weapons.

While the Predator is armed with two Hellfire missiles, the Reaper can carry 14 of the air-to-ground weapons — or four Hellfires and two 500-pound bombs.

"It's not a recon squadron," Col. Joe Guasella, operations chief for the Central Command's air component, said of the Reapers. "It's an attack squadron, with a lot more kinetic ability."

"Kinetic" is Pentagon argot for destructive power.

"The name Reaper captures the lethal nature of this new weapon system," Gen. T. Michael Moseley, Air Force chief of staff, said in announcing the name last September.

General Atomics of San Diego has built at least nine of the Reapers thus far, at a cost of $69 million per set of four aircraft, with ground equipment.

The Air Force's 432nd Wing, a UAV unit formally established on May 1, is to eventually fly 60 Reapers and 160 Predators. The numbers to be assigned to Iraq and Afghanistan will be classified.

The Reaper is expected to be flown as the Predator is — by a two-member team of pilot and sensor operator who work at computer control stations and video screens that display what the UAV "sees." Teams at Balad, housed in a hangar beside the runways, perform the takeoffs and landings, and similar teams at Nevada's Creech Air Force Base, linked to the aircraft via satellite, take over for the long hours of overflying the Iraqi landscape.

American ground troops, equipped with laptops can download real-time video from UAVs overhead.

The new robot plane is expected to be able to stay aloft for 14 hours fully armed, watching an area and waiting for targets to emerge.