Tag Archives: Stealth Chinook

Have a look at the following screenshots:

Don’t you think that the above helicopter recalls the possible shape of the Stealth Black Hawk (at least of the modified MH-60 that I imagined with Ugo Crisponi)? The funny thing this time is that, unlike the famous Dragon Models Limited kit that will be available from July 2011 and whose box cover artwork was released at the end of May, the above screenshots are from a videogame that was released on Mar. 11, 2011, more or less two months before the doomed stealth helicopter involved in Operation Neptune’s Spear crash landed in the Osama Bin Laden compound at Abbottabad.

Even the crash landing scene depicted above could be similar (althought it should be set at night) to the one of Abbottabad on May 2 before the Navy Seals put the explosive in the remains of the helicopter to destroy it.

The name of the video game is “Homefront”. According to Wikipedia it is “a first-person shooter video game developed by Kaos Studios and published by THQ, in which players play as members of a resistance movement fighting against a near-future Korean military occupation of the United States. The story was written by John Milius, who co-wrote Apocalypse Now and wrote/directed Red Dawn. It was released for Xbox 360, PlayStation 3, and Microsoft Windows, and also made available through OnLive on March 15, 2011 in North America, March 17, 2011 in Australia, March 18, 2011 in Europe,[5] and April 14, 2011 in Japan. Its tagline is: “Home is where the war is.”

Kudos to those who, envisaging the existence of a black stealth helicopters in the near future (Homefront is set in 2025), have designed, by coincidence or not, a helicopter whose shapes resemble those of our famous “Silent Hawk” (and much thanks to Marco Olimpio for the heads up).

The video below provides some information about the plot of Homefront:

Those who were worried that China could get its hands on some pieces of the ill-fated chopper that crashed in the Osama Bin Laden compound to reverse-engineer the Stealth helicopter have to accept the unpleasant reality that the Chinese have already copied it. As a matter of fact, on May 23, 2011, Dragon Models (based in Hong Kong, China) announced a new model (to be released in July): the 1/144 scale Stealth Helicopter “Operation Geronimo” (Twin Pack).

Image: Dragon Model Limited

If you look at the artwork on the box, you’ll notice that the one created so quickly by DML is quite similar to the concept I developed with Ugo Crisponi. It has the same (fictional) intakes and exhausts, and the overall shape is almost identical. To be honest it also includes some of the inaccuracies of our famous MH-60X rendering (dated May 5) that we fixed in a subsequent “release” (published on May 17) and a few more (based on the artwork, the blades seem quite unrealistic while the horizontal stabilizers are different from what the pictures suggest).

Anyway, here below you can find the May 5 sketch and if you compare it to the above image, you’ll see that, most probably, I and Ugo had the same ideas about the Stealth Black Hawk as the Dragon graphic designers. Noteworthy, the model comes with the unofficial/unconfirmed raid’s codename, since the official one is Operation Neptune’s Spear and not Operation Geronimo (“Geronimo” was the codeword for Bin Laden’s capture or death).

Above: the Stealth Black Hawk rendering I published on this site on May 5. Below the new version issued today (May 31, 2011).

Here’s an excerpt of how Dragon introduces its new model:

[…] Looking like a mixture of MH-60 Black Hawk and F-117 Stealth Fighter, this mysterious helicopter from the 160th Special Operations Aviation Regiment (SOAR) has distinctive edges and angles. The fuselage, nose and tail were all modified to reduce the craft’s radar cross-section.

[…]Befitting the innovative and ultra-secretive shape of the helicopter, this model is newly tooled in every aspect. All the low-observable features such as the angled surfaces are carefully rendered. […]

To be or not to be [Stealth]: that is the question

If Drangon dared to venture into a Stealth model about which we still know very little (even if a 1/144 scale is small enough to “hide” some unknown details), Italian model manufacturer Italeri, took a different approach. Instead of producing a small kit of the Stealth Black Hawk basing on few pictures or artworks they announced a larger 1:48 UH-60/MH-60 Black Hawk “Night Raid”. The model box in this case is depicted performing a “generic” Special Forces operation inside a compound in Afghanistan (or Iraq).

Italeri told me that they have decided not to launch a product that, most likely, would have been quite different from the real Stealth Black Hawk, given the few images and known facts available to date. So they released a “normal” Black Hawk even if they are ready to work on a realistic “Silent Hawk” as soon as new details about the modified MH-60 used in the OBL raid will surface.

Whatever the choice (stealth or not stealth), such a quick reaction by both Dragon Models and Italeri shows how fast the response to a news story (and to the subsequent market demand) can be.

Dealing with the daily updates about the OBL raid and the Stealth helicopter, here’s an interesting news: on May 30 some media reported the (unconfirmed) news that two helicopters crossed the border between Afghanistan and Pakistan to take five Taliban members in North Waziristan, and bring them back across the border into Afghanistan. This article provides an interesting analysis of the episode. Obviously, I’m not suggesting Stealth Black Hawks were involved again; however, given that the targets were high-value ones and that this kind of mission (once again in “enemy territory”), if confirmed, would be probably carried out by Special Forces, who knows?

I’ve already written a lot about the Stealth Black Hawk, whose existence is proven by pictures taken at Abbottabad the day after Osama Bin Laden raid, and about a Stealth Chinook theoretically taking part in Operation Neptune’s Spear. However I hadn’t thought about another stealth helicopter possibly flying in Pakistan during the OBL raid until I saw a video of a 160th SOAR rescue mission in Iraq that reminded me that the Night Stalkers often fly mixed formations of Black Hawks and MH-6 Little Birds, smaller choppers conducting, for example, rooftop insertions of Special Forces. The 160th SOAR is equipped with both MH-6s and AH-6s, the attack version of the Little Bird, aircraft that were used in almost all US (special) operations: from Op. Urgent Fury (1983, Grenada) to Just Cause (1989, Panama) to Gothic Serpent (1992, Somalia) to Iraqi Freedom (since 2003) the MH-6s have been a constant presence within some of the most difficult operations involving Delta Force and Navy Seals. In 2009, AH-6s took part in the helicopter assault (involving Navy Seals) to kill wanted terrorist Saleh Ali Saleh Nabha in Baraawe, Somalia, taking off from a US vessel. Having imagined the possible shape of a Stealth Black Hawk and Chinook, why not consider the possibility that even a modified, quieter, stealth MH-6X took part in the OBL raid flying with the 160th SOAR? I know that there’s almost nothing that can give some credence to this theory especially because another Stealth helicopter on the scene would make the air space over Abbottabad too crowded. However, I wanted to give it a try and hear what my readers think about a Stealth Little Bird. So, once again, I’ve asked Ugo Crisponi to help me with a rendering of a fictional “Black” MH-6 (6-bladed main rotor and 4-bladed tail rotor) that could be obtained with some modification of the original Little Bird:

I’ve just said that there is “ALMOST” nothing to give credence to the new theory of a Black fleet made by Stealth Black Hawk, Chinook and Little Bird. In fact, a highly modified “Black” Hughes 500s, was used by the CIA in 1972 from a Laos base. An extremely interesting article published in 2008 by Air & Space recalls the story of two OH-6As which were modified to fly with Air America and “to quietly drop off and pick up agents in enemy territory”. Dubbed “Quiet One”, the somehow stealth helicopters conducted their secret mission, on Dec. 5 and 6, 1972, when they carried in N. Vietnam commandos to place a wiretap and a solar-powered relay station that enabled Americans to eavesdrop communications on a telephone line used by the enemy commanders.

The article, written by James R. Chiles, provides some interesting details about the “Quiet One”:

The slapping noise that some helicopters produce, which can be heard two miles away or more, is caused by “blade vortex interaction,” in which the tip of each whirling rotor blade makes tiny tornadoes that are then struck by oncoming blades. The Quiet One’s modifications included an extra main rotor blade, changes to the tips on the main blades, and engine adjustments that allowed the pilot to slow the main rotor speed, making the blades quieter […]. The helicopter also had extra fuel tanks in the rear passenger compartment, an alcohol-water injection system to boost the Allison engine’s power output for short periods, an engine exhaust muffler, lead-vinyl pads to deaden skin noise, and even a baffle to block noise slipping out the air intake.

The extensive alterations did not blank out all noise, Taylor says. Rather, they damped the kinds of noise that people associate with a helicopter. “Noise is very subjective,” he says. “You can reduce the overall noise signature and an observer will still say, ‘I can hear it as well as before.’ It’s related to the human ability to discriminate different sounds. You don’t hear the lawnmower next door, but a model airplane is easily heard. It has a higher frequency and seems irritating.”

It also explains that some Quite One’s modifications can be found on later choppers:

“The agency got rid of it because they thought they had no more use for it,” says Glerum. At least one of the ex-Quiet Ones surfaced years later at the Army’s Night Vision & Electronic Sensors Directorate in Fort Belvoir, Virginia.

But according to the participants, no more were built. It’s puzzling why the CIA did not keep a stable of Quiet Ones, at least while the technology remained under wraps. And it remained a secret for more than two decades, until Ken Conboy and James Morrison told the story in their 1995 book Shadow War.

But there were valid reasons for dropping the Quiet One from the spymasters’ catalog.

“In the long run, the 500P was not the best for setting wiretaps,” says Casterlin. “It was not good for high-altitude work.” It was a light helicopter and had to be loaded with gear that cut into its payload capability and operating altitude. The Twin Pack was much louder but also simpler to run and more powerful, so Air America used it for later wiretap missions in North Vietnam. At least one tap, placed on the night of March 12-13, 1973, was successful.

Some of the Quiet One’s innovations did show up on later helicopters, including the Hughes AH-64 Apache, which has a scissor-style tail rotor. And Hughes engineers’ interest in modifying the tips of the main rotor blades to cut the slapping noise caused by blade vortices has been taken up by other experts. Aerospace engineer Gordon Leishman and his team at the University of Maryland, for example, are developing a blade with curved tubes at the tip to divert the air, thereby countering vortex formation. But, thanks to its many unusual modifications, the 500P still holds the title that Hughes gave it in April 1971: “the world’s quietest helicopter.”

Take a look at the following screenshots taken from a Youtube video taken with a helmet-mounted camera by US Special Forces (Delta Force’s A Sqn) rescuing Italian and Polish contractors from a hideout in Iraq with the help, once again of the 160th SOAR, on Jun. 8, 2004.

The first thing  I thought when I saw the footage is that sometimes history repeats itself.

Here the full video. The impact is clearly visible at mins 1.23 and 1.49:

Contractors had been abducted in Baghdad on Apr. 13, 2004 along with another Italian citizen, Fabrizio Quattrocchi, who was killed by kidnappers on Apr. 14.
A daring rescue operation was put into action as soon as coalition forces gathered reliable information on the location where the hostages were being held. As the footage shows, the 4 MH-60s (using c/s “Prince 61 – 64”) along with 4 escorting AH-6s (“Granite 71 – 74”) flew  over Baghdad then approached fast and low the compound where the workers were held.
While the third MH-60K (“Prince 63”) was flaring before touch down (with a dust cloud raised by the preceeding choppers) it hit the comp0und’s wall with its tail rotor beam/stabilizer. Fortunately, unlike what happened in Afghanistan during Operation Neptune’s Spear, the Black Hawk did not break apart and it was able to land allowing the SOF operators to leap out and to rescue hostages. The operation was successful (as the OBL raid was) and the helicopter was (probably) able to return to its base (the video doesn’t show this phase so we can’t be completely sure it didn’t suffer some structural damage).

Anyway, what happened during the 2004 rescue in daylight conditions, seems like a confirmation to what I’ve already suggested yesterday (pt1) describing the possible root causes of the crash landing of the Stealth Black Hawk during the OBL raid: the helicopter might have hit the compound’s wall on fast approach for landing at night with NVG in a particularly long and exhausting mission. A lesson to be learned for future special ops involving low level approaches to compounds surrounded by walls?

An interesting article published yesterday by the Associated Press and commented by Wired/Danger Room, provided some interesting details about the Osama Bin Laden raid. Indeed, anonymous government sources have told the story to the AP even if information they disclosed, raise more questions…
Anyway, first of all, I can’t help but notice that my possible explaination of Operation Neptune’s Spear (OBL raid’s name), published on May 6, was not disproved by facts disclosed so far!

Five aircraft flew from Jalalabad, Afghanistan, with three school-bus-size Chinook helicopters landing in a deserted area roughly two-thirds of the way to bin Laden’s compound in the Pakistani city of Abbottabad, two of the officials explained.

Good. The departure aerodrome is Jalalabad (my guess was right)  and there were also 3 Chinooks. Let’s have a look to what I wrote on May 6:

“I think there are two possibilities: both [helicopters involved in the raid] were Silent/Stealth/Upgraded/Modified/etc. Black Hawks; or 2 were Stealth Black Hawks and Stealth Chinooks. I don’t believe that “normal” MH-47s were involved as some media speculated (for the above mentioned considerations on the stealthiness of the formation) so, I’m almost sure only new Black Hawks were used. However, since we now know that a Black Helicopter exists, I can’t completely rule out the possibility that, along with a Stealth Black Hawk, somewhere there’s also some sort of modified Stealth Chinook flying“.

Since the officials confirmed that 3 Chinooks were involved and given that a mixed formation of stealth and non-stealth helos would have rendered the entire formation clearly visible on radars and audible from distance, I believe that there must be also a modified MH-47 flying with the 160 SOAR. Unlike the Black Hawk, we have no photographic evidences of it, but I think that their existence is somehow confirmed by the fact that the officers admitted their presence on the scene. Furthermore, it is quite obvious that the sources are trying to deceive the public opinion when they say to the AP journalist that:

The Black Hawks were specially engineered to muffle the tail rotor and engine sound, two officials said.

You can’t reduce noise by modifying only the tail rotor. Even the main rotor had to be fixed. And what about the anti-radar finish to enhance stealthiness? In my opinion, as explained in the last post on this subject, the Stealth Black Hawk is a highly modified version of the UH-60 helicopter.

I’ve asked once again to Ugo Crisponi to prepare a sketch of how a Stealth Chinook might look like by applying more or less the same modification used for the Stealth Black Hawk.

The same AP article then gives some details about the Stealth’s crash landing:

The added weight of the stealth technology meant cargo was calculated to the ounce, with weather factored in. The night of the mission, it was hotter than expected. […]

The plan unraveled as the first helicopter tried to hover over the compound. The Black Hawk skittered around uncontrollably in the heat-thinned air, forcing the pilot to land. As he did, the tail and rotor got caught on one of the compound’s 12-foot walls.

On this topic I had a chat with a friend of mine, who’s a former helicopter combat pilot with some Tour of Duty in Afghanistan. He’s quite skeptical about the “weather factor”: Abbottabad is “only” 4.000ft AMSL and at night, the temperature is always (well) below 30° C. Even a heavy modified helicopter should not have problem hovering over the compound. Hence, there could have been three kind of “root cause” for the crash landing:

1) flying a very risky mission at night with Night Vision Goggles, the pilots could have lost situational awareness and impacted the compound’s wall while approaching it for landing. This would explain why the tail is cut as images show
2) the helicopter, flying at lower altitude than the other Stealth Black Hawk, was hit by wake turbulence generated by the other chopper’s rotor. “It’s a very dangerous situation” my friend told me “since the turbulence hits both the main and tail rotor, giving almost no chances to react”
3) there was a “recirculation condition”: exacerbated by proximity to walls or cliffs or trees, this occurs when the air passes down through the rotor disc, hits the ground, moves out horizontally, hits the wall, goes up and then gets sucked down again through the rotor. You then have air that is already moving down coming through the disc and this leads to a greater power requirement which can then make the effect worse. This accident may not have been helped by the modifications to the tail rotor to make it stealthy that also reduced its efficiency and need for more power. It may not have been helped by pilot’s under pressure,
coming in low and fast, possibly with obscured vision behind the first aircraft throwing up dust/sand.