Little remote-controlled helicopters zip around the battle
unleashing Hellfires. Unmanned Aerial Vehicles (UAVs) play battlefield postmen
as they drop off medicine and ammunition before heading for home. These could
be scenes from a Hollywood sci-fi flick, complete with handsome actors and bad
dialogue.
But truth will be stranger than fiction as the Army prepares
to transform UAVs from dutiful reconnaissance drones into attack platforms and
transport vehicles. With the Air Force and Navy way ahead in the game with
their development of Unmanned Combat Aerial Vehicles (UCAVs), it was inevitable
that the Army would follow suit [see MAT Vol. 1, No. 5]. Mindful that the Air
Force and CIA used armed Predators in Afghanistan, its answer to the UCAV is
the Unmanned Combat Aerial Rotorcraft (UCAR), a small unmanned attack
helicopter.
At the same time, the Army is testing how to arm its
fixed-wing UAVs. “Right now we are looking at different ordnance that the Army
currently has in inventory and how we are going to adapt them to UAVs that we
already have in production and deployment,” said an Army officer familiar with
the UAV program. The Army has already launched Hellfires from another, more
primitive remote-controlled helicopter, according to an Army officer familiar
with aviation.
Recently, the Army successfully launched a Brilliant
Anti-Armor submunition (BAT), an acoustic- and infrared-guided weapon designed
to attack moving vehicles. Phase 2 of these tests will use the improved BAT P3I
(a planned product improvement of the BAT), which incorporates millimeter-wave
radar and an improved infrared guidance to attack stationary targets such as
missile launchers.
Other potential weapons include Stingers missiles (in an air-to-air
role) and the Advanced Precision Kill Weapon System, which adds laser targeting
to the low-cost HYDRA-70 2.75-inch rockets currently in service. UAVs will
eventually be armed with the Common Missile, in the planning stages as a
replacement for aging TOWs and Hellfires, said the Army official.
He noted that the Predators in Afghanistan were a useful
test, saying, “The lessons of that were the demonstration of some operational
concepts and applications of armed UAVs. What Predator has done with the Hellfire
in Afghanistan has shown how you can, in an operational situation, integrate
the UAV, the weapon, the manned aviation in the area, ground control and
targeting.”
The official sees the program operating in two phases. First
will come existing UAVs armed with weapons already in service or deployed by
2007. These are stopgap solutions that will hold the line while the UCAR
migrates from the drawing board into operational use. Defense Advanced Research
Projects Agency (DARPA) spokeswoman Jan Walker said the agency would hand off
the program to the Army for system development around 2010.
The Useful UCAR
It is easy to understand the attraction of a Vertical
Takeoff and Landing craft (VTOL). VTOLs may lack the speed and range of their
fixed-wing counterparts, but they can hover, and that is good enough. They
require little space for takeoffs and landings, and can operate from the
roughest airstrips.
The Department of Defense (DoD) is moving aggressively on
this by leapfrogging the UCAR on the progress made in the UCAV. In May, DARPA
and the Army selected four teams of contractors to participate in the first
phase of the UCAR program with each team given $3 million apiece
Each team has 12 months to conceptually design a system,
followed by a nine-month phase where one or two of the teams will be chosen to
complete a demonstration project. The plan is to use existing technology as
much as possible. Rather than employing a dedicated ground station, UCARs will
be controlled from existing platforms such as the Comanche attack helicopter,
the Army Airborne Command and Control System or ground stations already used for
other UAVs. However, the UCAR will be programmed to have great autonomy during
missions, with human controllers handling tasking and authorizing weapons
release.
Beyond sparing pilots from risking their lives in
particularly hazardous missions, the UCAR is supposed to be much cheaper than
its manned counterparts. DARPA is aiming for a 20 percent to 40 percent savings
over the Comanche flyaway cost as well as 50 percent to 80 percent reduction
over Apache operating and support costs.
The New Barnstormers
The Army official likens the current state of UAV
development to the barnstorming days of aviation in the 1920s and 1930s. It was
a time when military aircraft gradually became more sophisticated as nations
determined new roles for the infant flying machines. “In World War I planes
were strictly for artillery spotting, then we dropped things from them, then we
put machine guns on them, and now we use them for electronic surveillance and
refueling.”
He also does not believe the UCAR will solely be a combat
vehicle. “I don’t really anticipate that we will develop an aircraft that only
uses weapons. We want multi-use aircraft where the payload can accommodate
weapons or other payloads such as reconnaissance, communications relay, target
designation or some types of logistics payloads.”
For example, what if one night the weather is so bad or the
flak so thick that resupply helicopters just cannot get through to a
beleaguered Ranger platoon? UAVs could potentially do the job. “What we’re
looking at in some simulations is how you would use the UAV with GPS and
precision guidance to coordinate an airdrop of payload into a designated area
and return to base,” the officer said.
UAVs are also integral to the Army’s Future Combat System
(FCS) concept, which specifies a long-endurance UAV as well a short-range,
low-altitude aircraft. A draft of the Force Capabilities assessment calls for
reconnaissance UAVs to be organic assets down to the brigade and battalion
level. Unmanned aircraft, typically working in tandem with manned Comanche
attack helicopters or controlled by ground stations, will target hostile forces
artillery and air strikes or engage the enemy with their own weapons.
The FCS envisions using UAVs as relay stations when
communications are disrupted by long distances or restricted line-of-sight.
Other missions include reconnaissance to assist in taking urban areas,
supporting isolated American forces, or interdicting enemy reinforcements. With
the FCS also envisioning unmanned ground vehicles for attack and observation,
the image of a battlefield where unmanned craft dominate the land and sky is
not farfetched.
In the days of Lindbergh, ground commanders only slowly
learned to accept and exploit the capabilities of aviation. Will today’s land
warriors be comfortable with armed UAVs or remote-controlled attack
helicopters? There is a perception that rotorcraft technology is harder to make
mature and that the craft are less mechanically reliable, according to Daryl
Davidson, executive director of the Association for Unmanned Vehicle Systems
International, Arlington, VA. “The number of things that can go wrong is
greater than with a fixed-wing system. I think there is more comfort with a
fixed-wing system, even though conceptually there are a quite few things that a
VTOL system can give you that fixed-wing aircraft can’t.”
The Army expert believes that UAVs are in a situation like
the barnstorming days of aviation. “Just like in the 1920s and 30s, you are
looking for a balance. And then eventually, the confidence in the unmanned
systems to be used independently of the manned systems for aviation missions
will take place,” he predicted. “In the next 10 years, we are going to see
manned/unmanned teaming in the aviation area and air-ground synchronization for
unmanned systems operating autonomously without manned escort.”
Armed UAVs are here to stay, agrees Davidson, who points to
the absence of public criticism of using armed Predators in Afghanistan. “They
may not be a perfect solution yet, but they have been identified as a valuable
asset. And especially with mobile weapon systems that we are trying to track
down, you can minimize the time to target and strike it.”
Like the Air Force and DARPA, the Army is sensitive to the
political hot potato of using the word “autonomous” in conjunction with armed
UAVs. For now, it is political fantasy that the craft will be able to fire
without human intervention. “You read Popular Science and you get the idea that
we’re going to send these things out into somebody else’s country and they are
to going to root around like something out of Jurassic Park,” complained the
Army official.
But efforts are underway to define just what “autonomy”
means, said Davidson. “A lot of labs and organizations within the government
can’t even agree on what that word means.”
For the foreseeable future, UAVs will team up with manned
helicopters such as the Apache. “One of the things that we have done so far,
where we have been very successful, is where you have a UAV that is out
somewhere in front of a manned aircraft and is providing surveillance and
reconnaissance, such as sending video back to an Apache Longbow, for instance,”
the Army official. The Army is equipping its UAVs with DoD’s Standard Tactical
Control Data Link.
Special operations forces are taking advantage of small
UAVs. “We’re also doing some things with the light infantry type units where
they are using the UAVs that belong to the intelligence community to do route
recon and surveillance,” said the official.
Army UAVs will perform the “dull, dirty and dangerous” tasks
that would endanger or waste manned aircraft. A dangerous mission might be
suppressing enemy air defenses, while dirty would be flying in chemically
contaminated areas. A dull task would be loitering for hours as a communications
relay station. “You have a whole bunch of missions that are not
aviation-specific, such as rapid medical resupply, logistics missions, comm
relay missions, chemical detection, and mine detection. Those missions will be
done by the ground operators.”
As with the other services, the Army is working out the
kinks in using UAVs in the busy airspace of a battlefield. “Right now we’re
working on airspace deconfliction, ingress and egress routes, airspace command
and control, said the official. “The Army is in many ways the lead on this
because we have done manned/unmanned teaming.”
The Little Hummingbird That Could
Weapons and cargo canisters are great, but UAVs and manned
helicopters must be on the battlefield to use them. Long range has not been a
feature of rotary-wing aircraft, but even as DARPA develops the UCAR, it is
pushing the envelope of range and endurance with new propulsion technologies
that could bestow Army aviation with the long legs of an Olympic runner.
One DARPA testbed is the A-160 Hummingbird, a
remote-controlled helicopter that is intended to demonstrate a “unique
propulsion system,” said DARPA spokeswoman Walker. DARPA is aiming for a
rotary-wing aircraft with endurance greater than 2,500 nautical miles and an
endurance of 24 to 48 hours. “The goal is to develop a rotary-wing aircraft
with the endurance of a Predator-class UAV,” Walker added.
Manufactured by Frontier Systems in Irvine, CA, and funded
with DARPA and Army money, the Hummingbird has a theoretical range of 3,000
nautical miles, can carry a maximum 2,500-pound payload or 500 pounds for 30
hours, and fly at 35,000 feet, according to Frontier CFO Gale Kerem. Its long
legs come from a very rigid, very strong optimal speed rotor (OSR) that allows
it to easily adjust its RPM without vibration. “If you want to become more fuel
efficient, you’re going to have to vary the RPM as needed,” said Kerem.
At cruising speed the vehicle can tool along using only 50
percent power, or the helicopter equivalent of cruise control. Range is also
boosted because almost 80 percent of the aircraft is made of composites. “A
very important function of it would be to go a thousand kilometers out, do a
24-hour loiter, and come back,” Kerem said.
Such endurance can ease the strain of overseas operations
where helicopters must be ferried by transport aircraft or ships. Instead they
can be flown directly to remote areas instead of “loading up helicopters on a
C-5 and paying some country to land on their airfields,” said Kerem.
Kerem claims there are other novel features to the Frontier
design. For one, it is acoustically a stealth aircraft. “Because of the rotor,
it is very quiet. We are trying to hit 15 decibels less than normal
helicopters,” she said. “When you’re hearing the rotor turn in a ground test
from a thousand feet away, and you hear a Black Hawk take off a mile away, the
difference is amazing.” And while it has a large radar signature common to all
helicopters, the OSR rotor may throw off enemy radar operators for a while
because of its variable RPM.
Another unusual feature is an arm designed to lift and
deposit payloads, which is made possible by the strength of the rotor. “The
aircraft will be able to extend a manipulating arm from its belly that is able
to extend beyond the rotor,” Kerem said.
Kerem estimates that a rotorcraft like the A-160 could be 30
percent to 40 percent more expensive than a Predator. However, she explains,
those additional costs are canceled by the expense of constructing airfields
for fixed-wing aircraft.
There are currently three prototypes of Frontier’s design,
which first flew in January of 2002. In March 2002, a flight demonstration
lasted for two hours, during which the A-160 engaged its variable RPM rotor.
According to Kerem, based on their fuel consumption calculations for that
flight, the rotorcraft could have flown for 3,000 miles.
As part of the A-160 program, Frontier has also modified a
lightweight unmanned commercial helicopter into a new model called the
Maverick. “It’s a smaller craft that up to eight hours of endurance, or carry
500 pounds for three to four hours.” It is a cheap alternative for training
Hummingbird operators. “I can tell you I don’t fly any helicopters or aircraft,
but I can fly this,” Kerem said. “It’s like controlling Pac-Man. You need about
ten minutes briefing before you can fly it.” The Maverick may also see more
specialized use. Reportedly it has caught the eye of U.S. special operations
forces.
However, the UCAR or Hummingbird fare, it is a certainty, as
events in Yemen recently proved, that Army UAVs will carry weapons and much
more. The dutiful drone has come of age.