Germany’s COBRA 600 IRIS-T Carrier Drone Makes First Flight

A jet-powered German drone built to carry an IRIS-T air-to-air missile has completed its first flight, covering more than 20 kilometres in a test that its developers describe as the opening step toward an airborne launcher for short-range air defence.

The COBRA 600 was flown in the second half of August by POLARIS Raumflugzeuge, the Bremen-based company developing the airframe, in cooperation with Diehl Defence, which supplies the missile. The flight was announced on Aug. 22. Further trials are planned in the coming months.

An airborne rail launcher

The concept behind COBRA is unusual enough to require explaining. Rather than building a drone that carries a missile under its wing in the conventional manner, POLARIS and Diehl have designed a small flying-wing aircraft with a rail launcher mounted on top of the fuselage, carrying a single IRIS-T.

The programme is called AirLAS — Airborne Launching and Attack System — and was unveiled at the ILA Berlin airshow earlier this year. The two companies signed an exclusive cooperation agreement at the Paris Air Show in June 2025.

COBRA 600 has a take-off mass of under 600 kilogrammes, of which the IRIS-T accounts for roughly 85. Propulsion comes from four JetCat P1000-PRO micro turbojets — small engines of the kind used in large model aircraft and target drones, clustered to produce useful thrust at low cost. The airframe derives from POLARIS’s MIRA III flying-wing testbed, an aircraft the company had already been flying as part of its spaceplane development work.

The problem it addresses

Ground-based air defence has a geometry problem. A surface-to-air missile launched from the ground must climb through the thickest part of the atmosphere and spend much of its energy simply reaching altitude, which limits how far out it can engage. An identical missile released at altitude by an aircraft already travelling at speed starts the engagement with that energy in hand and reaches considerably further.

The conventional solution is a fighter aircraft on combat air patrol. The difficulty is that fighters are scarce, expensive to keep airborne and needed elsewhere. An uncrewed launcher costing a fraction as much can loiter without consuming pilot hours or risking aircrew.

Ukrainian and German commentary, including reporting by Defense Express and Militarnyi, has linked COBRA specifically to the problem of Russian Su-34 aircraft releasing KAB glide bombs from standoff distances. Those launch aircraft sit outside the reach of most ground-based systems and turn away before anything can engage them. An IRIS-T carried forward and released at altitude would extend the engagement envelope into the airspace where they operate. POLARIS’s own statement is more restrained, describing the aircraft simply as designed to carry and launch IRIS-T missiles for air defence missions.

Why IRIS-T

The missile choice is not incidental. IRIS-T is an infrared-guided short-range weapon already in wide European service, with a high-agility seeker and thrust-vectoring that gives it an unusually wide off-boresight engagement capability. Diehl has adapted it before: the IRIS-T SLM and SLS ground-launched variants form the backbone of Germany’s donated air defence in Ukraine and have been ordered by several European states.

Taking the same missile airborne on a cheap uncrewed platform continues a pattern that has served Diehl well — reusing a proven, in-production seeker and motor rather than developing a new weapon for each launch mode. It also means COBRA draws on an existing munitions stockpile rather than requiring its own.

Caveats

A 20-kilometre first flight is an early milestone and should be read as such. It establishes that the airframe flies with a representative payload on the rail. It does not establish that the missile can be launched safely from a top-mounted rail without the exhaust plume or the aircraft’s own wake disturbing the launcher, that the drone can be cued by an external sensor network, that the IRIS-T seeker can acquire a target handed to it from a platform without a radar, or that the whole system can be produced at a price that justifies the concept.

Each of those is a substantial engineering problem. Top-mounted launch in particular is uncommon for good reason: the missile must clear the airframe cleanly, and a flying wing has little structure above the centreline to shield.

Why it matters

What makes COBRA worth watching is less the aircraft than the category. European air defence spending since 2022 has concentrated on ground-based systems — more Patriot, more IRIS-T SLM, more short-range effectors — because that is what could be bought quickly. The limitation of that approach is that ground systems defend points, and there are more points than there are batteries.

An expendable or attritable airborne launcher offers a different trade: less capable than a fighter, far cheaper, and able to be positioned where the threat is expected rather than where the battery happens to sit. Several countries are exploring variations on the idea. Germany, through a small company better known for spaceplane research and a missile house with an existing production line, has now flown one.

Sources

• POLARIS Raumflugzeuge statement on the COBRA first flight, Aug. 22, 2026
• The Aviationist, “Cobra 600 Air Defense Drone Completes First Flight”
• Janes, “ILA 2026: Diehl debuts Cobra 600 ‘airborne launch rail'”
• Defense Express and Militarnyi reporting on the COBRA 600 test flight and its intended role
• The War Zone, “Germany’s Cobra 600 Is A Jet Powered Interceptor Drone That Slings An IRIS-T Missile”