A photograph of an Israeli Air Force F-35 flying (more or less..) “over” Beirut has been made public. Interestingly, the image seems to prove the stealthy aircraft was flying with radar reflectors.

As reported yesterday, the Israeli Air Force F-35 stealth aircraft have had their baptism of fire taking part in air strike in the Middle East (Syria and another unspecified “front”) lately. “The Adir planes are already operational and flying in operational missions. We are the first in the world to use the F-35 in operational activity” the Israeli Air Force Commander, Maj. Gen. Amikam Norkin, said during a IAF conference attended by 20 commander of air forces from around the world. Interestingly, Norkin also presented an image showing an IAF F-35I over Beirut, Lebanon that was not released in first place but surfaced on social media on May 23.

Here it is:

הנה הוא מעל ביירות. pic.twitter.com/vOwLpmVFFx

— nir dvori (@ndvori) May 23, 2018

The somehow blurry image is interesting for at least a couple of reasons: first of all, it shows the aircraft flying at high altitude off (rather than “over”) Beirut. Second, it seems to show that the aircraft was also operating with radar reflectors (highlighted in the image below), hence not in “stealthy mode”:

Here’s what radar reflectors, also known as RCS (Radar Cross Section) enhancers, are as explained in a previous article this Author posted here at The Aviationist earlier this year:

Stealth aircraft, such as the F-22 Raptor or the F-35 Lightning II 5th generation jets are equipped with Luneburg (or Luneberg) lenses: radar reflectors used to make the LO (Low Observable) aircraft (consciously) visible to radars. These devices are installed on the aircraft on the ground are used whenever the aircraft don’t need to evade the radars: during ferry flights when the aircraft use also the transponder in a cooperative way with the ATC (Air Traffic Control) agencies; during training or operative missions that do not require stealthiness; or, more importantly, when the aircraft operate close to the enemy whose ground or flying radars, intelligence gathering sensors.

This is what we explained explaining how the Israeli the heavy presence of Russian radars and ELINT platforms in Syria cause some concern to the Israeli F-35 Adir recently declared IOC:

[…] the Russians are currently able to identify takeoffs from Israeli bases in real-time and might use collected data to “characterize” the F-35’s signature at specific wavelengths as reportedly done with the U.S. F-22s.

In fact, tactical fighter-sized stealth aircraft are built to defeat radar operating at specific frequencies; usually high-frequency bands as C, X, Ku and S band where the radar accuracy is higher (in fact, the higher the frequency, the better is the accuracy of the radar system).

However, once the frequency wavelength exceeds a certain threshold and causes a resonant effect, LO aircraft become increasingly detectable. For instance, ATC radars, that operate at lower-frequency bands are theoretically able to detect a tactical fighter-sized stealth plane whose shape features parts that can cause resonance. Radars that operate at bands below 300 MHz (lower UHF, VHF and HF radars), such as the so-called Over The Horizon (OTH) radars, are believed to be particularly dangerous for stealth planes: although they are not much accurate (because lower frequency implies very large antenna and lower angle accuracy and angle resolution) they can spot stealth planes and be used to guide fighters equipped with IRST towards the direction the LO planes might be.

F-35s deployed abroad usually feature their typical four radar reflectors: to exaggerate their real RCS (Radar Cross Section) and negate the enemy the ability to collect any detail about their LO “signature”. As happened during the short mission to Estonia and then Bulgaria, carried out by the USAF F-35As involved in the type’s first overseas training deployment to Europe or when, on Aug. 30, 2017, four U.S. Marine Corps F-35B Lightning II joined two USAF B-1B Lancers for the JSF’s first show of force against North Korea: the F-35Bs flew with the radar reflectors, a sign they didn’t want their actual radar signature to be exposed to any intelligence gathering sensor in the area

The two radar reflectors installed on the right side of the F-35. The other two are on the other side.

Since they almost always fly with the radar reflectors, photographs of the aircraft without the four notches (two on the upper side and two on the lower side of the fuselage) are particularly interesting: for instance, some shots taken on Jan. 24, 2018 and just released by the U.S. Air Force show F-35As deployed to Kadena AB, Japan, in October as a part of the U.S. Pacific Command’s Theater Security Package program, preparing to launch without their Luneberg reflectors.

According to Nir Dvori, the journalist who first published the image of the stealth aircraft off Beirut seemingly flying with RCS enhancers, “they test [the F-35] in all kind of options. Fly with and without reflectors”. Indeed, the use of RCS enhancers would simply mean that stealthiness was not required for that specific mission during which they preferred to hide the aircraft’s stealth features preventing the enemy to collect data about the aircraft and test their radar hardware against the Lightning II. Moreover, the F-35 appears to be flying off Lebanon, accompanied by another aircraft (the photo ship), possibly another F-35 or a completely different type – even a G550 like those that continuously fly off Lebanon and Syria and are trackable by means of their Mode-S transponders. This means that the photo might well have been taken during a simple “recon” mission rather than a combat one. Meanwhile, according to Haaretz’s Anshel Pfeffer:

Not all the missions that the F-35 has so far carried out needed this [stealth] capability. They took part in an airstrike on a Hamas tunnel on the border of the Gaza Strip. Hamas does not have radar, but F-35s were used on this relatively simple mission as part of the process through which its proves it various capabilities. More complex operations against Iranian and Hezbollah targets north of Israel would have utilized its stealth capabilities and some of these did not necessarily involve the F-35 launching missiles itself.

Therefore, it seems confirmed that:

– Not all F-35 missions required stealth capabilities
– The Adir jets were also used against “easy” targets
– The F-35s have taken part in missions during those the Adir did not drop bombs (therefore, it probably acted as “combat battlefield coordinator,” collecting, managing and distributing intelligence possibly sharing targeting data to older 4th Gen. aircraft).
– The image seems to prove the F-35 have flown at high-altitude off Beirut (someone says it might have been in international airspace, 12 Nautical Miles from the coast, when the shot was taken, but this can’t be verified based on the screenshot only).

Disclaimer: to our knowledge and based on the sources available on the Internet, those four bumps highlighted in the images you can find in this post are indeed radar reflectors. Several magazines and publications also refer to them as RCS enhancers or Luneberg lenses. Still, if we are wrong and these are EW signal emitters as someone claims, please let us know. Furthermore, the top image is a screenshot from a slide presented during a IAF conference not an actual photograph.

Quite surprisingly, Russia sent two of its Su-57 stealth jets to Syria. So, once again, Moscow will use the Syrian Air War as a test bed for its most advanced “hardware”. But the deployment is both an opportunity and a risk.

Late on Feb. 21, a photo showing two Russian Su-57 jets allegedly landing at Khemimim air base, near Latakia, in northwestern Syria, circulated on Twitter. The two stealth combat aircraft were reportedly part of a larger package of assets deployed to the Russian airbase in Syria, that included also four Su-35S and one A-50U AEW (Airborne Early Warning) aircraft.

Didn’t see that coming!!#RuAF deployed today few numbers of their fifth generation fighter jet the Su-57 in #Khmemeim #Syria

Along with
4 Su-35
4 Su-25
1 A-50U pic.twitter.com/2W9ZLPNAOs

— Wael Al Hussaini (@WaelAlHussaini) February 21, 2018

Interestingly, the aircraft appeared to be in “clean” configuration, that is to say they didn’t carry the large fuel tanks used for ferry flights last year.

Although the deployment of two Russian 5th generation aircraft (that has not been officially confirmed yet) came somehow unexpected, it must be noted that it’s not the first time that Moscow deployed some of its advanced “hardware” to Syria. For instance, on Sept. 13, 2017, the Russian Air Force deployed some of its MiG-29SMT multirole combat aircraft to Khemimim airbase for the first time. Previously, in February 2016, it was the turn of the still-in-development Tu-214R spyplane to exploit the air war in Syria to test its sensor packages.

As reported several times commenting the above mentioned deployments, Russia has used the Syrian Air War to showcase and test its latest weapons systems. However, most analysts agree that the deployment of the Su-57 is probably mostly meant to send a strong message about air superiority over Syria, where Russian and American planes have almost clashed quite a few times recently (with conflicting reports of the incidents).

Deploying two new stealth jet in theater is a pretty smart move for diplomatic and marketing purposes: as already explained questions continue to surround the Su-57 program as a consequence of delays, engine problems and subsequent difficult export (last year the Indian Air Force reportedly demanded an end to the joint Indo-Russian stealth fighter project). Albeit rather symbolic, the deployment of a combat aircraft (still under development) is obviously also a huge risk.

First, there’s a risk of being hit (on the ground or during a mission: the attack on Latakia airbase or the recent downing of a Su-25 are just reminders of what may happen over there) and second, there’s a risk of leaking intelligence data to the enemy.

This is what we explained in a recent article about the reasons why U.S. and Russia are shadow-boxing over Syria:

USAF Lt. Col. Pickart’s remarks about the Russians “deliberately testing or baiting us” are indicative of a force managing interactions to collect sensor, intelligence and capability “order of battle”. This intelligence is especially relevant from the current Syrian conflict as it affords both the Russians and the U.S. with the opportunity to operate their latest combat aircraft in close proximity to gauge their real-world sensor capabilities and tactical vulnerabilities, as well as learn doctrine. It is likely the incidents occurring now over Syria, and the intelligence gleaned from them, will be poured over in detail for years to come.

For instance, we have often explained how Raptors act as “electronic warfare enabled sensor-rich multi-role aircraft” over Syria, providing escort to strike packages into and out of the target area while gathering details about the enemy systems and spreading intelligence to other “networked” assets supporting the mission to improve the overall situational awareness. In fact, the F-22 pilot leverage advanced onboard sensors, as the AESA (Active Electronically Scanned Array) radar, to collect valuable details about the enemy, performing ELINT-like missions and then sharing the “picture” with attack planes, command and control assets, as well as Airborne Early Warning aircraft.

In fact, even though it’s safe to assume that the stealth prototype will not use their radar and that the Russians will escort the Su-57s with Su-30/35 Flanker derivatives during their trips over Syria in order to prevent the U.S. spyplanes from being able to “characterize” the Su-57’s signature at specific wavelengths as reportedly done by the Russians with the U.S. F-22s, it’s safe to assume the U.S. and NATO will put in place a significant effort to gather any little detail about the performance and operational capabilities of the new Russian stealth jet.

By the way, before you ask, the risk of confrontation with their U.S. stealth counterparts has not been mentioned, since it seems quite unlikely at the moment..

Top image credit: Aleksandr Markin – T-50 (51), CC BY-SA 2.0

Some recent photos of the Hill AFB F-35s deployed to Kadena Okinawa, seem to suggest the 5th Generation fighters have started operating in “stealth mode”.

Stealth aircraft, such as the F-22 Raptor or the F-35 Lightning II 5th generation jets are equipped with Luneburg (or Luneberg) lenses: radar reflectors used to make the LO (Low Observable) aircraft (consciously) visible to radars. These devices are installed on the aircraft on the ground are used whenever the aircraft don’t need to evade the radars: during ferry flights when the aircraft use also the transponder in a cooperative way with the ATC (Air Traffic Control) agencies; during training or operative missions that do not require stealthiness; or, more importantly, when the aircraft operate close to the enemy whose ground or flying radars, intelligence gathering sensors.

This is what we explained explaining how the Israeli the heavy presence of Russian radars and ELINT platforms in Syria cause some concern to the Israeli F-35 Adir recently declared IOC:

[…] the Russians are currently able to identify takeoffs from Israeli bases in real-time and might use collected data to “characterize” the F-35’s signature at specific wavelengths as reportedly done with the U.S. F-22s.

In fact, tactical fighter-sized stealth aircraft are built to defeat radar operating at specific frequencies; usually high-frequency bands as C, X, Ku and S band where the radar accuracy is higher (in fact, the higher the frequency, the better is the accuracy of the radar system).

However, once the frequency wavelength exceeds a certain threshold and causes a resonant effect, LO aircraft become increasingly detectable. For instance, ATC radars, that operate at lower-frequency bands are theoretically able to detect a tactical fighter-sized stealth plane whose shape features parts that can cause resonance. Radars that operate at bands below 300 MHz (lower UHF, VHF and HF radars), such as the so-called Over The Horizon (OTH) radars, are believed to be particularly dangerous for stealth planes: although they are not much accurate (because lower frequency implies very large antenna and lower angle accuracy and angle resolution) they can spot stealth planes and be used to guide fighters equipped with IRST towards the direction the LO planes might be.

F-35s deployed abroad usually feature their typical four radar reflectors: to exaggerate their real RCS (Radar Cross Section) and negate the enemy the ability to collect any detail about their LO “signature”. As happened during the short mission to Estonia and then Bulgaria, carried out by the USAF F-35As involved in the type’s first overseas training deployment to Europe or when, on Aug. 30, 2017, four U.S. Marine Corps F-35B Lightning II joined two USAF B-1B Lancers for the JSF’s first show of force against North Korea: the F-35Bs flew with the radar reflectors, a sign they didn’t want their actual radar signature to be exposed to any intelligence gathering sensor in the area.

Since they almost always fly with the radar reflectors, photographs of the aircraft without the four notches (two on the upper side and two on the lower side of the fuselage) are particularly interesting: for instance, some shots taken on Jan. 24, 2018 and just released by the U.S. Air Force show F-35As deployed to Kadena AB, Japan, in October as a part of the U.S. Pacific Command’s Theater Security Package program, preparing to launch without their Luneberg reflectors.

The lack of reflector on the top left position of this F-35 is pretty evident in the following photographs:

 

For comparison, the following photo shows one of the 388FW F-35A jets on the ground at Kadena in November 2017 with the radar reflector.

Obviously the lack of radar reflectors is not a big deal: during their deployment to RAF Lakenheath last year, F-35As of the 388th FW have flown without reflectors some local sorties with the 48th FW F-15E Strike Eagles (for example on Apr. 26, 2017). However, photographs of deployed F-35s without Luneburg Lenses are pretty rare and, for this reason, interesting and newsworthy.

 

 

A Naval Aeronautics professor analyzed the stealthiness the MiG-31, the fictional aircraft of Clint Eastwood’s techno-thriller action “Firefox” movie, in a presentation to General Dynamics and NASA.

A couple of weeks ago we have published a story on the MiG-31 Firefox, the Soviet stealth interceptor aircraft, capable of Mach 6 introduced by a 1977 novel of the same name by Craig Thomas, and made popular by an action movie, released in 1982, produced, directed by and starring Clint Eastwood.

As written in that story, the shape of the Firefox differs a lot between the first novel and film. The version in the novel resembles a MiG-25 “Foxbat”, much like the real Mikoyan MiG-31 “Foxhound” whereas the movie version is a more futuristic design, unlike any other planes of the 1970s or 1980s, an aircraft apparently influenced by the speculation about what the soon-to-be-revealed “stealth fighter” might have looked like.

Few hours after the article was published, one of our readers sent us an email to let us know that we had left something pretty good out of the Firefox article. Indeed, a Navy academy professor did a presentation on the actual stealthiness of the Firefox. The pics were posted on the \r\specialaccess subreddit a couple years back.

Here is the analysis:

Firefox Mig31 stealth analysis

Actually, the Firefox stealth jet has often been used for instructional purposes, especially when it deals with stealth technologies.

“This Mig-31 “Firefox” fictional jet fighter was used in the introductory slides of our presentation “Low Observable Principles, Stealth Aircraft and Anti-Stealth Technologies”, presented at the 2nd Int’l Conference on Applications of Mathematics and Informatics in Military Sciences (AMIMS), at the Hellenic Military Academy, Vari, Athens, Greece, in April 2013, in order to attract the attention of the audience (and it’s been working perfectly ever since): click here for the presentation” Konstantinos Zikidis, Maj. HAF, one of the authors, wrote in a comment thread to the original article on The Aviationist.

H/T to the “nerds” from the \r\specialaccess subreddit”

With New Projects in Development, and New Construction, The Area is Ramping Up.

We’re not sure what is happening inside (and close to) the restricted Nevada Test and Training Range (NTTR), but after visiting the area earlier this month, we are reasonably certain something significant is taking place right now. The massive area, reported to be 4,531 square miles, is one of the most secure national security sites and is closed to the public.

Earlier this month we drove the remote roads along the perimeter of the NTTR between Las Vegas, Nevada and Beatty, Nevada on the way to and from the Jedi Transition low-level flying area in Death Valley National Park. While this is one of the emptiest, most barren stretches of paved highway in the U.S. in just a few hours we made a number of interesting observations.

Sometime after 3:00 AM across from Creech AFB we saw a military-aged male with a beard in civilian clothes and a medium-sized piece of luggage or large lunch box board an airport-style shuttle bus and drive away on Highway 95 west of Creech. The vehicle drove a significant distance west and north on the highway before we lost sight of it. There is almost nothing out there. On the trip back that night we saw an F-117 fuselage covered by a tarp being transported on a flatbed truck in the dark west-bound on Highway 95. Earlier in the day someone had gotten photos of it by the side of the road.

In less than 24 hours, on one stretch of road at the outskirts of a massive 4,000+ mile testing range, we saw that much activity.

Moreover, the following day, on Nov. 14, an authority on the area referred to only as “G” of lazygranch.com, shot photos of an F-117 flying with a two-seat F-16. The very same day, in the afternoon a similar (or maybe the same with a diffirent configuration) two-seat F-16, carrying the Lockheed Martin’s AN/AAS-42, an IRST (Infra Red Search and Track) pod (theoretically capable to detect stealth aircraft by their IR signature), with sparse markings was photographed flying through the Jedi Transition. The photo was good enough that we could identify a patch worn on the right shoulder of each of the aircraft’s flight suits. The patches suggest the crew are associated with the famous “Red Hats” opposing forces test unit and the 53rd TEG Det 3, the unit thought to have replaced the 4477th “Red Eagles”, another opposing force simulation and testing unit.

Separate and additionally from those sightings near or around Tonopah Test Range, journalist Tyler Rogoway at The War Zone, has been a keen observer of the Nevada Test and Training Range. Rogoway reported on the appearance of several new construction projects at Area 51, notably, a new “U” shaped taxiway, vehicle roadway and most interestingly, a large aircraft hangar.

If you compare satellite imagery of Area 51 beginning in 1984 you see a progression of small changes followed by the significant addition of a long, second, parallel runway. Work on the second runway began in 1990 and seemed complete in about 1992. From 1999-2000 several new buildings appeared in satellite photos. In 2001-2002 an intermediate vehicle road connecting taxiways and runways was built. And most recently, in 2013, a major new construction project began at the southwest corner of the area. Soon after, in July 2014, the U.S. Air Force issued a request for proposal for a new, long range, low-observable strike aircraft. The project became the LRS-B. From 2014 to 2016 a large, new hangar was built at the southwestern corner of the facility. The structure appears to be nearly large enough to house an aircraft the size of the current B-1B Lancer bomber.

The latest satellite photos show what appears to be new engine test facilities, and most significantly, the southern taxiways and hangar in new-looking condition. Comparing the satellite photos of the facility going back to 1984, the two most significant, visible expansions are the second runway in 1990 and the new southwest square taxiway and hangar building beginning in 2014.

The following video takes you on a “sightseeing tour” of Groom Lake from Tikaboo Peak:

Noted aerospace imaging expert Al Clark told TheAviationist.com, “In the general Groom Lake image our best reference is one of the F-16s parked on the west side of the base. The F-16 length is approximately 50-feet. Building number one, which is almost directly west of the F-16s is approximately 120’x120’. It looks to be an engine test/run-up hangar. The building that is more interesting is approximately 250-feet wide by a length of 275-feet. This is interesting because the B-2 wingspan is only 172-feet, so this is [possibly] designed to house large aircraft, in my opinion possibly the B-21 Raider. To the southwest of that structure it looks like what could be a weapons storage facility. The smaller bunker is approximately 75-feet long by 30-feet wide, and the larger bunker is approximately 75-feet wide and 100-feet long. Those are fairly large weapons bunkers. The general placement of the munitions depot tells me that there is something pretty volatile in it because they are keeping it away from the main base at Groom Lake.”

Is what we are seeing evidence of the LRS-B program development and the B-21 Raider? While there are likely several other major developmental programs underway including a new manned or unmanned reconnaissance and strike platform (the RQ-180 spy drone is one of them), LRS-B and B-21 are the most mature and most talked about in official channels and, as a result, most conclusions point to something related to their development out at Area 51 in the new hangar.

Prior to her departure from the office, former Air Force Secretary Deborah James told media, “Our 5th generation global precision attack platform will give our country a networked sensor shooter capability enabling us to hold targets at risk anywhere in the world in a way that our adversaries have never seen.” Her comments about the LRS-B program and B-21 acknowledge both the capability and necessity of the program, and may suggest the urgency of it as the Air Force maintains its small fleet of B-2 Spirit low-observable long range strike aircraft against a growing demand for its unique capability.

That might mean we are seeing the B-21 Raider development program take shape right under our noses at Area 51. Or this is what they want us to believe.