Connect with us

Hi, what are you looking for?

Smart Bombs: Military, Defense and National Security

Stealth Helicopters: Why Hasn’t This Idea ‘Taken Off’?

RAH-66 Comanche
RAH-66 Comanche. Image Credit: Creative Commons.

Stealth technology is very much in fashion. Modern aircraft designers basically treat stealth as a prerequisite for any new fighter or bomber design. Since the 1980s, each new U.S. fighter and bomber has included stealth with aircraft such as the F-117 Nighthawk, B-2 Spirit, F-22 Raptor, F-35 Lightning II, and the forthcoming B-21 Raider.

U.S. military rivals are rushing to catch up, designing and producing their own stealth aircraft. China’s stealth efforts have manifested in the Chengdu J-20 fighter. About 50 J-20s have been produced so far, meaning China has a viable fleet of stealth fighters. Russia has also invested its finite resources into stealth technology, producing the Su-57 fighter (a CGI version of which was just featured in Top Gun: Maverick). 

Why are countries scrambling to field fleets of stealth aircraft? Because modern air defense systems are so capable that non-stealth aircraft are roughly incapable of surviving in contested airspaces. Meaning if an enemy’s air defenses are intact, non-stealth aircraft are at ultra-high risk of being shot down and are unlikely to be effective – which means those non-stealth aircraft are unlikely to convert contested air space into secured airspace. Said another way, countries need stealth aircraft to gain air superiority in territories where sophisticated air defense systems are entrenched. 

But while stealth technology has become a prerequisite in fighters and bombers, helicopters are still operating with conventional, non-stealth technology.

Stealth helicopters are still a novelty. Only a few have ever been built. The reason, in part, is that helicopters are inherently ill-suited for stealth – turbine exhaust is loud, the entire fuselage vibrates, and the tail rotor is loud. The thing is just not designed to move about undetected. So, considering the inherent challenges of creating a stealth helicopter, the fact many designers are still trying is significant.

The most famous example of a stealth helicopter is perhaps the Boeing-Sikorsky RAH-66 Comanche. The Comanche program, which the U.S. Army spent $7 billion dollars on between 1996 and 2004, was an attempt to create a mainstream stealth helicopter to replace the Army’s OH-58 Kiowa. The Kiowa is a scout helicopter, so it makes sense that the Army wanted a stealth helicopter with low observable characteristics. 

Two Comanches were built. Using composite materials, the Comanche had a very smooth 43-foot fuselage, covered with radar-absorbent material (RAM) coatings and infrared-suppressant paint. The Comanche also featured an all-composite, five-blade rotor, which churned softly, relative to other helicopters. The craft looked like a science-fiction prop from a James Cameron or Steven Spielberg film. And with respect to stealth, the Comanche was effective, too; the Comanche’s radar cross-section was 360-times lower than the Apache’s.    

The Comanche never entered production. “Aspects of Comanche’s technology were deemed too risky (i.e. immature i.e. hadn’t actually been developed i.e. didn’t exist),” Dan Ward wrote for TIME. “The design still had serious technical challenges in the areas of “software integration and testing of mission equipment, weight reduction, radar signatures, antenna performance, gun system performance, and aided targeted detection algorithm performance. Aside from the electronics, the software, the weapons system, the engines, and the overall weight apparently everything else was fine.” 

Ward’s snark is understandable: the Comanche was, without question, one of the biggest financial flops in U.S. Army history. A total of $7 billion was spent for approximately zero operational Comanche helicopters. 

The stealth helicopter would appear again – in the most famous military operation of the 21st century: the raid on Osama bin Laden’s compound. 

RAH-66

RAH-66. Image Credit – Creative Commons.

RAH-66 Comanche

For the bin Laden raid, UH-60 Black Hawks were modified to operate as stealth aircraft. Details about what the stealth modifications included exactly have been scant. But then-President Barack Obama confirmed in his memoir, A Promised Land, that the helicopters were in fact stealth. During the raid, one of the helicopters crash-landed. The Navy SEAL team onboard escaped mostly unharmed and destroyed the aircraft in an effort to prevent the technology from being captured and reverse-engineered.

Given the secretive nature of the technology used during the bin Laden raid, we can assume the public does not know everything there is to know about stealth helicopter development.  

Harrison Kass is the Senior Defense Editor at 19FortyFive. An attorney, pilot, guitarist, and minor pro hockey player, he joined the US Air Force as a Pilot Trainee but was medically discharged. Harrison holds a BA from Lake Forest College, a JD from the University of Oregon, and an MA from New York University. He lives in Oregon and listens to Dokken. 

Written By

Harrison Kass is a Senior Defense Editor at 19FortyFive. An attorney, pilot, guitarist, and minor pro hockey player, he joined the US Air Force as a Pilot Trainee but was medically discharged. Harrison has degrees from Lake Forest College, the University of Oregon School of Law, and New York University’s Graduate School of Arts & Sciences. He lives in Oregon and regularly listens to Dokken.

4 Comments

4 Comments

  1. pagar

    November 11, 2022 at 11:37 pm

    Many countries are now capable of producing ‘stealth’ copters, but don’t want to pour huge money into doing it.

    A copter can be made ‘stealthy’ or more specifically, become invisible from radar detection via electronic means, not just the type of material used or the shape of the rotors.

    A powerful, or truly super duper ultra powerful, electronic black box carried by the copter scans for hostile radar waves.

    Then the incoming waves are identified & separated as ultra frequency and/or ultra high frequency and exact wavelengths they are operating.

    The super duper black box then transmits the same exact waves outward but exactly 180° out of phase to the incoming ones.

    The source of the hostile radar waves will fail to obtain any return signal, thus the copter becomes invisible.

    However, there is the big problem of the hostile radar switching the frequencies of the outgoing waves at a very rapid pace, possibly overloading or even frying the copter’s black box.

    Also, the searching radar could be equipped with multiple search arrays with different operating frequecies for each array, making it difficult for the black box to send out the correct opposing wavelengths.

    Then there’s the thing called optical-infra red search that’s immune to cancelling waves.

    All the above problems need massive amounts of money to surmount and most nations don’t want to waste the money.

    They would rather prefer to pour the cash into weapons of shock & awe. Like hypersonic warheads, thermobaric warheads, burning lasers, kamikaze drones and dial-a-yield thermo warheads.

    Onto ww3, then !

  2. Jacksonian Libertarian

    November 12, 2022 at 1:10 am

    You don’t use secret technology on high risk attacks like the one on Bin Laden, unless you want the enemy to get their hands on it. It’s an example of intelligence work to let the enemy think they have an intelligence coup, when they have captured a money pit that isn’t suitable for the battlefield.

    Manned combat aircraft are obsolete despite stealth giving manned systems a short life extension at enormous cost. UAVs are just way better at battlefield tasks. Having the most and smartest weapons is far more important than how they are delivered to the battlefield.

  3. GhostTomahawk

    November 12, 2022 at 1:55 am

    I’m sure the CIA has some modified Comanche helicopters in their inventory.

  4. MichaelFallwell

    November 12, 2022 at 4:50 am

    I recently came across the specs for the rmk30 a Mauser design. It is unique because of its recoil system, that would allow it to be fired from a very light aircraft or a large drone. I think this could be the perfect weapon to allow Ukraine to defend its airspace without a lot of support from the US. Is there anything we could do to help this along? There are a number of Canard aircraft that could be used as a start.

Leave a Reply

Your email address will not be published. Required fields are marked *

Advertisement