Hypersonic

Castelion has released what appears to be the first image of its relatively ‘cheap’ Blackbeard hypersonic missile being fired from a ground launcher, providing a new look at the containerized launch architecture now under development for the U.S. Army.

The photograph, posted by Castelion on X, shows a Blackbeard missile leaving a launcher mounted on a high-mobility truck chassis. While the missile itself is by now a familiar sight, the new image offers a first public glimpse of how Castelion intends to package and operate the ground-launched version of Blackbeard, known as Blackbeard GL.

The Army’s previously disclosed plans for the program call for an initial Blackbeard ground-launch demonstration using a modified Multiple Launch Rocket System Family of Munitions, or MFOM, pod, followed by the development of Blackbeard GL prototypes and a dedicated launcher pod. Ultimately, the service intends to conduct an MVP flight test using the M142 High Mobility Artillery Rocket System’s (HIMARS) fire-control system.

The Army’s Fiscal Year 2027 budget documentation indicates that this effort is moving toward increasingly representative hardware. Among the milestones listed for FY2027 is a live-fire launch of a “production representative” Blackbeard GL and launcher pod.

Castelion has already released extensive imagery of Blackbeard test vehicles, and the company formally unveiled the weapon’s current external configuration earlier this year. Those images showed a two-stage arrangement with a booster and an upper vehicle that has characteristics consistent with a hypersonic glide or maneuvering payload. Compared to the air-launched version, seen below, the ground-launch model lacks the cruciform tailfins at the rear of the lower stage, but otherwise appears similar.

The precise propulsion system and flight profile of the production weapon remain undisclosed. Little is known about its performance parameters, either. Castelion has previously hinted that the missile could strike targets at ranges of just under 500 miles, although its range would likely be reduced when launched from the ground, without the altitude and speed provided by an aircraft launch platform.

The launcher appears to use a relatively compact enclosed container, consistent with the Army’s stated interest in leveraging the existing MFOM ecosystem and, eventually, HIMARS. The photograph doesn’t establish how many Blackbeards could be carried by a single launcher, although, based on the dimensions, at least two and perhaps as many as four missiles appears a feasible load.

Exactly how closely the pictured launcher corresponds to the eventual production Blackbeard GL pod is also not yet clear. Castelion has previously stressed that its test hardware is deliberately designed to support rapid development cycles and should not necessarily be interpreted as representative of the final weapon system.

Castelion had previously shown Blackbeard-related test articles alongside palletized launch equipment, including launch hardware mounted on an Oshkosh MKR18 Logistics Vehicle System Replacement truck. The company has also said it was converting such a vehicle into a launcher for flight testing. That appears to be the vehicle shown in the new image, too.

The Army’s interest in Blackbeard GL is rooted in cost as much as performance.

The service has described the weapon as an affordable, mass-produced hypersonic precision-fire capability intended to engage time-sensitive moving and hardened targets. The stated objective has been to obtain roughly 80 percent of the capability of the Army’s planned Precision Strike Missile (PrSM) Increment 4 while achieving a substantially lower cost per round.

Existing U.S. hypersonic weapons such as the Army’s Dark Eagle Long Range Hypersonic Weapon use large, highly specialized launch equipment. Blackbeard is instead being developed around the idea that a hypersonic weapon can be sufficiently compact, inexpensive, and manufacturable to be treated more like a conventional tactical munition.

A containerized launcher compatible with an existing mobile fires ecosystem would reinforce that concept. It could allow the Army to introduce a new hypersonic effect without creating an entirely separate launcher, crew, transport, and reload architecture.

The ground-launched version is only one part of Castelion’s broader Blackbeard effort.

The company is also working with the Navy to integrate the weapon onto the F/A-18E/F Super Hornet. In April, Castelion received a $105 million Navy contract supporting integration and the transition toward an early operational capability, while a subsequent $23.4 million order covered 50 early-operational-capability pre-production missiles and associated storage and shipping containers.

The Navy has since moved into additional procurement, underscoring Castelion’s effort to establish Blackbeard as a weapon that can be produced in the quantities required. Blackbeard could also find its way onto Navy ships and submarines, as well as ground-based launchers, as we have discussed in the past.

As for the Army, the next major milestone will be the planned production-representative Blackbeard GL and launcher-pod live-fire testing.

“Once Castelion achieves testing and validation, the Department will award a two-year multi-year procurement contract for a minimum of 500 Blackbeard missiles annually, with options to extend for up to five years,” the Pentagon announced in May of this year. “To further encourage Castelion’s self-funded facility expansion, the Department is actively seeking the necessary authorizations and appropriations to purchase over 12,000 Blackbeard missiles over five years.”

This reflects a broader and accelerating U.S. military push for lower-cost precision weapons that can be manufactured relatively simply and at scale, increasingly with help from non-traditional defense contractors. The goal is to build large stockpiles affordably before a major contingency, particularly a potential large-scale conflict with China in the Pacific, while ensuring production can keep pace with demand during a prolonged war.

For now, Castelion has demonstrated what the Army’s Blackbeard launch system actually looks like when it fires, at least in its initial form.

Contact the author: thomas@thewarzone.com

The South Korean government has released images from its first successful test of a domestically developed hypersonic boost-glide vehicle. This includes shots of the vehicle impacting the water at the end of its flight. A weapon of this kind would give South Korea a significant new way to hold targets in North Korea at risk amid an ever-deepening arms race on the Peninsula.

South Korea’s Presidential Office, more commonly referred to as the Cheong Wa Dae or the Blue House, announced the test in a Korean-language press release yesterday. The Blue House initially released a video of President Lee Jae Myung and others observing the test from a conference room at the Anheung Proving Ground, which is located in South Chungcheong Province on the country’s western coast. South Korea’s Agency for Defense Development (ADD) manages testing at Anheung. A series of still images from the test itself was subsequently posted on the Blue House’s website.

Included in the still image gallery are shots showing the launch of the missile, a formal name for which has not yet been disclosed, from a wheeled transport-erector-launcher on a platform sitting just off the coast. The low resolution of the pictures makes it hard to tell whether the missile and/or the TEL are of an existing South Korean design or are based on one. We will come back to this later on.

As mentioned, there are also pictures of the hypersonic boost-glide vehicle hitting the water. At first glance, the vehicle looks to have a broadly conical design with stabilizing fins at the base. However, at least one of the fins looks to be truncated. Closer inspection of the available images shows further indicators that might point to it actually having a more wedge-shaped design with a distinct top and bottom, though it is still not definitely clear given the low resolution. Conical boost-glide vehicles are generally understood to be easier to design, relatively speaking, than wedge-shaped ones. Historically, hypersonic boost-glide vehicles of any kind have proven to be technically complex and challenging to turn into viable operational weapons, even by countries with extensive past experience with their development.

“This test launch was conducted to verify, for the first time, the vehicle’s core technologies in a hypersonic flight environment: the performance of ultra-high-temperature heat-resistant materials, guidance and control capabilities, and the ability to perform irregular flight maneuvers at low altitudes,” the Blue House said in its release yesterday, per a machine translation of the Korean text. “The HGV [hypersonic boost-glide vehicle] successfully separated after ascending to the target altitude and executed its planned flight path within the hypersonic environment without any issues.”

With all this in mind, the fact that the vehicle just remained intact through to impact is noteworthy. At the time of writing, South Korean authorities do not appear to have disclosed more specific details about the test, including how far the boost-glide vehicle traveled before hitting the water or what peak speed it reached. Important questions also remain about how the vehicle is guided during the mid-course and terminal phases of flight, challenges that do not appear to have been addressed by this particular test.

In general, unpowered hypersonic boost-glide vehicles need to be brought first to an optimal altitude and speed. This is typically achieved using a sufficiently sized rocket booster, with existing ballistic missile designs often serving as a starting point.

Once released from the booster, a boost-glide vehicle flies along a relatively shallow flight path within the Earth’s atmosphere. The vehicle is able to maneuver along the way, sometimes erratically, while traveling at hypersonic speeds, generally defined as anything about Mach 5.

All of this sets hypersonic weapons of this kind apart from traditional ballistic missiles, even ones with advanced maneuverability capabilities, which all follow a broadly arcing trajectory to their targets. The combination of speed, flight trajectory, and maneuverability offered by hypersonic boost-glide vehicles creates distinct challenges for opponents. They are hard to spot and track, let alone attempt to intercept, and there is less time for defenders to react overall. This ability to penetrate enemy air defenses and cover ground rapidly makes these weapons particularly attractive for strikes on very high-value and time-sensitive targets.

“The HGV [hypersonic boost-glide vehicle] is a ‘key strategic asset capable of changing the game on the battlefield,’ as its unpredictable flight trajectory and overwhelming speed allow it to launch surprise strikes against key strategic targets during contingencies,” the Blue House’s release explicitly noted, again according to a machine translation.

With all this in mind, South Korea does have an entire family of domestically-produced ground-launched ballistic missiles that could be suitable starting places for launching an unpowered hypersonic boost-glide vehicle. President Lee was notably shown a TEL for the country’s newest Hyunmoo-5 ballistic missile at Anheung yesterday, though no explicit connection has been drawn between that weapon and the hypersonic test. The Hyunmoo-5 is itself still a relatively new development, having only entered service around the end of last year.

When it comes to new South Korean arms developments, the Hyunmoo-5, which entered service around the end of last year, has been and continues to be a major point of discussion by itself. It is officially categorized as a short-range design, despite how big it is (35 tons gross weight), which is said to be due largely to the equally substantial size of its warhead (17,000 pounds). Past reports have raised the possibility that it could be capable of flying out to intermediate ranges if the warhead weight were reduced. Short-range ballistic missiles are defined as ones with ranges between 190 and 620 miles (300 and 1,000 kilometers), while intermediate-range ballistic missiles can hit targets out to between 1,864 and 3,418 miles (3,000 to 5,500 kilometers). Medium-range ballistic missiles (MRBM) fall in between these two categories.

With its massive unitary warhead, the Hyunmoo-5 already gives South Korea an important new way to hold deeply buried and otherwise hardened targets in North Korea at risk. This fits in directly with the country’s broader Korea Massive Punishment and Retaliation (KMPR) policy, as TWZ has previously written:

“While the Hyunmoo-5 has been widely reported as a future pillar of the KMPR, its specific ability to penetrate deeply buried bunkers, such as those used by the North Korean leadership, the same functions mean that it can also fulfill elements of the ‘kill chain.’ In this way, it could be used as part of a pre-emptive strike, to try and knock out North Korea’s launch capability by targeting its hardened command-and-control facilities and missile storage areas.“

By virtue of the very high speeds they reach in the terminal phase of flight, hypersonic boost-glide vehicles also offer bunker-busting benefits on top of the other aforementioned advantages they bring to the table.

In addition, the hypersonic boost-glide vehicle test reflects a broader arms race that has been expanding in scale and scope for years now. South Korea is also developing an air-breathing hypersonic cruise missile, seen in the composite image below, as well as new air- and sea-launched ballistic missiles, the latter of which will be loaded on new surface warships and submarines.

Though there are always questions about the actual maturity and viability of the designs, North Korea continues to churn out its own new missile developments. This includes two separate test launches of purported new hypersonic designs just in recent weeks. Tit-for-tat missile launches are not entirely uncommon on the peninsula, but there are limits to how quickly a test like the one South Korea conducted yesterday involving an emerging technology can reasonably be staged.

Friction between the North and South has been at a particular high point, in general, following an incident on September 21, in which three South Korean troops were injured along the Demilitarized Zone (DMZ). South Korea’s Joint Chiefs of Staff (JCS), as well as the United Nations Command (UNC) on the Peninsula, have said a North Korean landmine placed in violation of the Armistice Agreement was to blame. South Korean authorities have demanded an apology and raised the prospect of some form of action in response, though President Lee has more recently sought to downplay the situation. The government in North Korea has denied the accusations and threatened an “immediate and powerful counteraction” should South Korea seek to retaliate.

An operational hypersonic boost-glide vehicle capability would also expand South Korea’s capacity to challenge opponents regionally beyond North Korea. Though the regime in Pyongyang represents the most proximate national security threat to the country, China and Russia have also been growing points of concern for South Korean authorities in recent years.

“We must secure our national security through our own strength,” President Lee said after yesterday’s hypersonic test, per the Blue House’s release. “The government must not rest on today’s success but must further advance the technology so that the hypersonic glide vehicle can establish itself as a robust strategic asset safeguarding our future security.”

South Korea’s very public test of its new hypersonic boost-glide vehicle underscores the country’s still-expanding efforts to broaden its options for striking even the best-defended targets in North Korea, as well as projecting power elsewhere regionally. At the same time, it remains to be seen when the South Koreans may field a real operational capability in this regard.

Contact the author: joe@twz.com

The U.S. Air Force’s scramjet-powered Hypersonic Attack Cruise Missile (HACM) has finally reached the flight test phase, with at least one “release” having been carried out so far over a range in Australia. HACM has suffered significant delays, and the Air Force has taken the risky step of scaling back overall testing plans to try to keep the program on schedule. The stated goal is to be able to make a decision to start rapidly acquiring HACMs in 2027.

The Air Force has been working on HACM in cooperation with the Royal Australian Air Force (RAAF). The program has been conducted, in part, under the broader umbrella of the U.S.-Australian Southern Cross Integrated Flight Research Experiment (SCIFiRE). The Defense Advanced Research Projects Agency’s (DARPA) Hypersonic Air-breathing Weapon Concept (HAWC) project also fed into HACM. Raytheon (now formally RTX), in cooperation with Northrop Grumman, was chosen to develop the missile in 2022. The weapon has reportedly been designated AHM-4A in a new branch of the U.S. military’s joint service nomenclature system for aircraft and missiles.

“The U.S. Air Force, in partnership with Australia, has conducted a flight test of the Hypersonic Attack Cruise Missile (HACM) as part of our continuous work to advance long-range strike capabilities,” an Air Force spokesperson confirmed to TWZ today. “This effort is part of the Southern Cross Integrated Flight Research Experiment (SCIFiRE), a collaborative agreement built on more than 15 years of partnership between our two nations.”

“Leveraging this enduring alliance, the Royal Australian Air Force executed the release of a HACM flight test unit over a designated Australian test range, gathering crucial data to advance the program’s objectives,” the spokesperson added. “The flight was the culmination of an extensive series of tests designed to measure the missile’s performance under realistic flight conditions.”

The spokesperson did not name the test range where the “release” was conducted or say when that occurred. Whether the missile flew under its own power for any amount of time after release is unknown. What aircraft was used to carry the missile aloft is also not known. TWZ has reached out for more information.

The Air Force did say previously that it planned to conduct HACM launches in Australia. The expectation has long been that this would be done at the country’s sprawling Woomera Test Range, which provides an ideal location for extended-range flight testing activities in general. The U.S. and Australia have partnered on other hypersonic testing at Woomera in the past, as seen in the video below. The remote inland location of the range complex makes it well suited for conducting more sensitive tests away from prying eyes, as well.

HiFiRE 5B rocket reached Mach 7.5

The Government Accountability Office (GAO), a Congressional watchdog, has also reported in the past that RAAF F/A-18F Super Hornets would be used to conduct at least some of the HACM test launches. This would fit with today’s statement from the U.S. Air Force saying that it was the RAAF that “executed the release.” The Air Force’s initial launch platform is the F-15E Strike Eagle, though others are expected to follow.

To date, neither the Air Force nor Raytheon has released a confirmed picture or rendering of HACM. In 2023, the Air Force did release a picture, seen below, showing an air-breathing hypersonic cruise missile test article related to either HACM or the preceding HAWC effort.

“The missile consists of two stages, a rocket booster and a scramjet cruiser, which separates from the booster and eventually dives toward its target,” according to GAO. Scramjets do not function effectively at lower speeds, and designs powered by them require some form of initial boost to a high Mach velocity. Hypersonic speed is generally defined as anything above Mach 5, but what HACM’s peak speed might be is unknown.

Two-stage air-breathing missile-like hypersonic vehicle designs have been tested on several occasions in the past. This includes Boeing’s scramjet-powered X-51 Waverider and HyFly 2 hypersonic test vehicles, among others. The X-51 (as its name indicates) and HyFly 2 also notably had so-called ‘waverider’ configurations designed to ‘skip’ on the shockwaves generated during high-speed flight to help provide additional lift. Whether HACM might also use this principle is not known.

X-51A WaveRider Scramjet Second Hypersonic Flight Test

It’s also worth noting here that Castelion’s Blackbeard hypersonic missile also has a two-stage configuration. It remains unconfirmed whether or not the second stage of that weapon is powered, but it does not appear to be an air-breathing design either way. Castelion is currently developing an air-launched version of Blackbeard for the U.S. Navy, which is also in flight testing now, as well as a ground-launched type for the U.S. Army. You can read more about that missile here.

Scramjet-powered air vehicle designs, including aircraft and missiles, have historically proven challenging. As noted, HACM has suffered delays over the years. The original goal had been to begin flight testing in 2024, which slipped first to 2025 and then 2026.

“The HACM program is on track to conduct its first flight test in the second quarter of fiscal year 2026, but officials said there is effectively zero margin left in the schedule for the rapid prototyping effort. The program has already descoped the rapid prototyping effort from seven to five planned flight tests,” GAO said bluntly in a report published in July. “The Air Force plans to produce 13 missiles during the rapid prototyping effort, including test assets, test spares, and operational rounds.”

“If a significant flight test failure occurs, it is likely that the program will not be able to complete all five tests within the 5-year rapid prototyping timeframe,” the report continued. “According to the program, completing at least the first three flight tests is critical for informing the Air Force’s decision to initiate a rapid fielding effort and procure HACM in fiscal year 2027.”

GAO’s July report, which had a January cutoff date, noted later on that the Air Force’s target date for initiating the rapid fielding effort, more specifically, was the first quarter of Fiscal Year 2027. This fiscal period began last Thursday and runs through the end of the year. Whether the service is still aiming to keep to that part of the schedule is unclear, but it would seem extremely difficult to do so.

“The HACM program has taken on risk to maintain its current schedule. According to program officials, maintaining the schedule has required aggressively resequencing activities to focus almost exclusively on those necessary to support the first flight test date,” GAO’s report added. “In some cases, officials said this has involved risky strategies, such as concurrently performing parts validation testing while completing the system’s design, which could require the redesign of key parts if they fail validation testing.”

In terms of U.S. hypersonic missile developments, challenges have also not been limited to scramjet-powered types like HACM. Air Force, Navy, and Army efforts to develop a variety of air- and surface-launched hypersonic missiles in various sizes and configurations have all suffered setbacks in the past decade or so. The Navy notably cancelled its own air-launched hypersonic cruise missile program, called Hypersonic Air-Launched Offensive Anti-Surface Warfare, or HALO, last year. The service subsequently shifted focus to the aforementioned Blackbeard under a program called the Multi-mission Affordable Capacity Effector (MACE). This has all prompted particular concerns about a growing and increasingly worrisome gap in this regard between the United States and its chief global competitors, especially China.

There is also a cost question. HACM traces to a time when hypersonic missiles were generally viewed, at least publicly, as highly capable, but also higher-cost and lower-density, assets. Blackbeard, for example, reflects a more recent push to develop and field more economical munition designs across the board that can also be more readily produced at scale. This demand signal has become even more pronounced in light of the dwindling American stockpiles of critical munitions due to the conflict with Iran, as well as other crises globally in recent years. More exquisite munitions, including hypersonic types, will still be part of the larger U.S. arsenal going forward.

Regardless, the U.S. military, as well as its Australian counterparts, have made it clear in the past that they view hypersonic weapons as critical for success in future conflicts, especially high-end fights, such as one in the Pacific against China. In general, air-breathing hypersonic cruise missiles offer a valuable and highly flexible way to strike targets, especially time-sensitive ones, quickly and over extended ranges. The weapon’s high speed and maneuverability drastically increase its ability to penetrate through enemy air defenses and reduce the total time an opponent has to react.

Whether or not the Air Force will be able to avoid any more major delays with HACM remains to be seen. The service’s goal to start at least limited production of HACM before the end of 2027, if not sooner, is even more ambitious now after years of schedule slips. As mentioned, officials have already acknowledged there was no more margin for error at the start of the year. There are many questions still about what form any initial fielding will take, and how that might be further impacted by the truncated testing plan.

The HACM program has at least now hit the important milestone of beginning flight testing.

Contact the author: joe@twz.com