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The RAH-66 Commanche could have been a stealthy helicopter.
So why didn’t the US military pull the trigger?
While the F-35 stealth fighter might come to mind today, in 2004 the most timely answer
might have been the RAH-66 Comanche.
The slick-looking stealth helicopter spent twenty-two years in development, consuming
over $7 billion dollars before being abruptly canceled with only two flying prototypes to
show for it.
The Comanche sprang of by the Army’s Light Helicopter Experimental program conceived
during the defending spending glut of the 1980s.
Among other objectives, this program sought a replacement for the Army’s OH-58 Kiowa
and OH-6 Cayuse scout helicopters, which were derived from the civilian Bell 206 JetRanger
and Hughes 500 choppers.
Scout helicopters were primarily tasked with spying out enemy positions and designating
them for attack by friendly forces.
However, they also were suitable for attacking lightly defended targets with rocket pods,
miniguns, and even tank-busting TOW or Hellfire missiles, while armored Apache gunships tackled
heavier foes.
Still, the Army wanted a more survivable scout helicopter to combat the Soviet Union’s
huge mechanized armies, which were well protected by self-propelled short-range anti-aircraft
missiles and rapid-firing flak cannons.
And what better way to outwit these radar-guided systems than with the stealth technology then
being pioneered on the Air Force’s F-117 stealth jet?
After six years of conceptual dithering, in 1988 the Army finally issued a Request for
Proposals and selected in 1991 a futuristic designed proposed by Boeing and Sikorsky.
This RHA-66 (Reconnaissance Attack Helicopter) was formally named after the Comanche Native
American tribe per Army custom.
You can see 90s-era design documents here.
The Pentagon allocated $2.6 billion to developing the chopper, 1,200 of which were eventually
planned for manufacture at the Sikorsky factory in Bridgeport, Connecticut for a total cost
of $34 billion ($28 million per helicopter).
That same year saw the dissolution of the Soviet Union—along with the rationale, and
budget, for building many gold-plated U.S. weapon systems such as the Sea Wolf-class
submarine.
Nonetheless, Boeing and Sikorsky proceeded with the development of two prototypes shaped
with non-radar-reflective surfaces made out of radar-absorbing composite materials.
This allegedly gave the Commanche 1/250th the radar cross-section of an OH-58, allowing
it to approach four times closer to an enemy prior to detection.
A heat-dispersing scheme channeled hot exhaust into the tail for cooling by the shrouded
tail fan and used infrared-dampening paint to reduce the scout chopper’s heat signature
to one-quarter of normal.
Even the five downward-canted blades atop the Comanche’s top rotor were designed to
produce half as much noise as a regular helicopter.
Should it be detected, the RAH-66 Comanche was further shielded by radar warning systems,
self-defense jammers, chaff and flare dispensers, and enough Kevlar and graphite armor to withstand
heavy machine-gun rounds and 23-millimeter shells.
A pilot and weapon-systems officers sat in a tandem arrangement, operating the helicopter
with special helmet-mounted sights and liquid-crystal multi-function displays.
Like a stealth fighter, the Comanche could carry up to six Hellfire anti-tank missiles
in internal weapons bays so that the protruding weapons didn’t increase its radar signature.
Even the scout chopper’s landing gear and chin-mounted triple-barrel 20-millimeter XM301
Gatling cannon were designed to retract inwards.
Should firepower take precedence over stealth, the RAH-66 could fit wing-stubs allowing it
to more than double its weapons load.
The Comanche was also the ultimate “dog-fighting” helicopter—with an impressive maximum speed
of two-hundred miles per hour, the agility to pull off tight turns and near loop-de-loops,
and capacity for twelve AIM-92 Stinger heat-seeking anti-aircraft missiles.
The chopper’s triple-redundant fly-by-wire flight control kept it stable even while undertaking
tight maneuvers.
In 1999 a videogame was even released pitting the much-anticipated scout helicopter against
the equally nimble Russian Ka-52 Hokum attack helicopter.
The RAH-66 used a long-range Forward Looking Infrared Sensor to spot enemies, which it
could then illuminate with a laser targeter.
A millimeter-wave Longbow radar could be optionally mounted atop the rotor, allowing the crew
to “peek” over concealing hill crests and trees.
Sensor data could then be relayed to friendly forces via high-speed data links.
In January 1996 a RAH-66 prototype finally made its first flight and a second prototype
joined it three years later.
But as later occurred with the F-35, the Comanche incorporated so many brand-new technologies
that developing, debugging and integrating nearly tripled development costs over time.
For example, the helicopter came to be hundreds of pounds heavier than expected, resulting
in post-facto weight-trimming and efforts to develop more powerful T800 turboshaft engines.
The RAH-66’s software proved buggy, it sensors unreliable, and its radar absorbent materials
susceptible to erosion when exposed to rain.
Meanwhile, the Army benchmarks crept upwards—for example requiring the light scout helicopter
somehow be able to carry enough fuel for trans-Oceanic ferry flights.
By 2002, the cost-overruns and delays had won the Comanche many bureaucratic foes, and
wars in Afghanistan and Iraq soon diverted spending to pressing operational contingencies,
resulting in planned procurement to nearly halve at 650.
Finally, in 2004 the Comanche was abruptly canceled after over $7 billion in spending,
including a half-billion-dollar cancelation penalty.
The two prototypes are now displayed the Army’s Aviation Museum at Fort Rucker, Alabama.
Had the Pentagon poured in additional billions, the RAH-66’s lingering bugs might eventually
have been ironed out, resulting in a decent scout helicopter.
But the twenty-two-year-old program simply was no longer relevant enough to justify its
financial excesses.
For one, stealth is much more of a “trump card” for a high and fast-flying jet plane
than a helicopter flying at a fraction of the speed at low altitude.
While the Comanche’s stealth properties were certainly useful, the helicopter would
have remained vulnerable to all manner of short-range anti-aircraft weapons and likely
heat-seeking missiles.
Indeed, the Army deemed the RAH-66 would have required costly additional upgrades to survive
the latest SAM systems.
Furthermore, unlike the F-35, the Comanche was fulfilling a relatively niche support
role in the Pentagon’s war machine.
The RAH-66 procurement would have consumed roughly 40 percent of the Army’s annual
aviation budget, even though transport and attack helicopters were higher priorities.
Besides, AH-64Ds were already being fielded with Longbow radars.
And for surveillance mission, the Army preferred to invest in cost-effective drones that could
undertake risky scouting missions without placing human lives at risk.
As Lt. Col. Dan Ward put it in a lacerating piece in Time Magazine, the Comanche was “unaffordable,
unnecessary and—despite more than two decades of effort—incomplete.”
The RAH-66 numbered amongst five Army programs that collectively sucked $30 billion in spending
without producing any operational systems.
At best, the RAH-66 pioneered technologies believed to have been integrated into special
MH-60 Blackhawk stealth helicopters used to perform secretive commando missions including
the Navy Seal raid which killed Bin Laden.
The Army went on using OH-58D Kiowa Warriors in Afghanistan and Iraq until the type was
finally retired in 2017—leaving the Army without any medium scout helicopters.
Several attempts to procure low-cost replacements such as the OH-58F and the ARH-70 Arapaho
subsequently fell through.
Late-model AH-64E Apache Guardians have replaced Kiowas in Attack/Reconnaissance battalions,
but have proven a poor fit for the mission.
Thus history seemingly is repeating itself as the Army is yet again seeking another cutting-edge
scout helicopter called Future Armed Reconnaissance Aircraft to enter production in 2028.
If FARA can overcome a legacy of past failures, it will likely do so by incorporating mature,
affordable technologies and staying committed to disciplined budgets and development processes.
The RAH-66 Comanche, in theory, might have been an awesome-looking helicopter—but that
did not make it any less of a poorly managed defense program.