How Solid Rocket Motors Sit Behind Türkiye’s Growing Missile Output

Every missile that leaves a Turkish launcher, from a short-range air-defence round to a 7-tonne ballistic weapon, gets its push from a motor most people never see. In a large share of them, that motor is solid. Türkiye’s missile output has grown fast in the past few years, and the less glamorous reason is that the country has been building the chemistry and casting capacity behind the propulsion, not only the airframes and seekers.

This piece explains how a solid rocket motor works, why militaries favour it, where ROKETSAN’s new propellant capacity fits, and how a Turkish hybrid-motor start-up differs from that approach.

How Does a Solid Rocket Motor Work?

The design is simple on paper. A solid motor has a casing, a propellant grain cast inside it, an igniter and a nozzle. The igniter lights the exposed surface of the grain. The propellant burns, the hot gas builds pressure in the casing, and the nozzle accelerates that gas out of the rear. The reaction pushes the missile forward.

The fuel and the oxidiser are already mixed inside the grain, so there are no pumps, valves or tanks to manage. Once lit, the motor cannot normally be throttled or switched off. It burns until the grain is consumed.

Most modern military motors use composite propellant. In the open literature, the typical recipe is an ammonium perchlorate oxidiser, powdered aluminium as fuel and a rubber-like binder, commonly HTPB (hydroxyl-terminated polybutadiene). Published ranges put aluminium at roughly 5 to 22 percent, ammonium perchlorate at 65 to 70 percent and the binder at 8 to 14 percent. Actual formulations used by any manufacturer, including ROKETSAN, are not public.

Why Do Armed Forces Prefer Solid Propellant?

Storage and readiness are the main reasons. A solid-fuelled missile can sit in a canister or on a truck for years and fire in minutes. Liquid-fuelled systems need fuelling, handling and more support equipment. For air defence and tactical ballistic missiles, that difference decides how quickly a battery can respond.

Grain geometry is the designer’s main tool for shaping performance. A star-shaped core exposes more surface at ignition and gives a strong initial thrust. A simpler bore gives a steadier profile. Engineers trade boost against sustain, weight against burn time, and all of it is fixed the moment the grain is cast.

The weaknesses are real. Solid motors are harder to control once lit, sensitive to temperature and ageing, and dangerous to manufacture. Casting large grains without voids or cracks takes specialist equipment and quality control, which is partly why few countries do it at scale.

Scale changes the problem. A small rocket motor can be cast in a single batch, while a motor for a multi-tonne ballistic missile needs large mixers, vacuum casting and long curing cycles, then X-ray or ultrasonic inspection to confirm the grain has no hidden flaws. One defect can change how the grain burns. That is why propellant plants, not launchers, tend to set the pace of missile production.

Which Turkish Missiles Depend on Solid Motors?

ROKETSAN’s range covers guided rockets, anti-tank weapons, air-defence interceptors, cruise missiles and ballistic missiles. Not all of them use the same propulsion. Turbojet and turbofan engines power cruise missiles such as ATMACA and SOM, which is a different technology altogether. The solid-motor line runs through the ballistic missiles, the rocket artillery and the interceptors.

The clearest example is the TAYFUN family. Open sources, including Wikipedia’s summary of the programme, describe its propulsion as composite solid propellant. They put the first Block 1 round at roughly 2,300 kg and 6.5 m, while the Block 4 shown at IDEF 2025 is reported at more than 7 tonnes and about 10 m. ROKETSAN has not published an official range for Block 4, and figures above 1,000 km remain open-source estimates. Our reporting on TAYFUN Blok-4 nearing service covers the timeline company officials have given, and the Blok-2 delivery to Land Forces shows the earlier variants are already being handed over.

Air defence follows the same logic. The short-range SUNGUR and the HİSAR family need compact, storable motors that can be stacked in launchers. ROKETSAN’s own company description says it designs and produces rocket motors, warheads and propellant for the systems it develops.

What Is ROKETSAN Building in Kırıkkale?

In April 2026 ROKETSAN announced a planned $3 billion infrastructure programme. According to Anadolu Agency, company head Murat İkinci said about $1 billion of it was done, including a $450 million fuel production plant in Kırıkkale, a new R&D centre with about 1,000 staff and a warhead facility he described as Europe’s largest. A 72,000-square-metre plant for air-defence and ballistic missiles had its groundbreaking the same week. İkinci said the company aimed to add another $2 billion in the coming period.

Turkish trade outlets have described the Kırıkkale plant as a fivefold increase in national solid-propellant output, but that multiple comes from secondary reporting, and the Anadolu report does not give capacity figures. Treat it as a reported claim, not a confirmed specification. Our ROKETSAN company profile covers how the Kırıkkale complex fits into the company’s wider build-out and its export limits.

Why does propellant capacity matter more than it sounds? A missile is only as available as its motor. If propellant and casting lines are the bottleneck, extra seeker or airframe output sits idle. Domestic capacity also lowers exposure to foreign suppliers of chemicals and energetic materials, an issue that has already come up in Turkish export discussions. ROKETSAN said it had secured more than $10 billion in new orders in the previous year, so demand is there to fill the lines.

Where Does Delta V Fit In?

Delta V is a separate story and not a solid-motor supplier. The company is a Turkish space-technology developer working on hybrid propulsion, in which a solid fuel is burned with a liquid or gaseous oxidiser. Reporting from October 2024 quotes general manager Mehmet Karaman saying the company had raised the thrust density of its SORS sounding-rocket motor by 300 percent, had completed 20 SORS launches and had built a cryogenic turbopump. It also mentioned a planned hard lunar landing mission with TÜBİTAK, and cooperation with ROKETSAN and the Presidency of Defence Industries (SSB). Those are company claims relayed by the press, and we could not check them independently.

Hybrids sit between the two traditional families. They can be throttled and shut down, and they are safer to store than many liquid systems, but they have so far proved harder to scale into high-thrust military missiles. For the battlefield rockets discussed above, solid propellant remains the working choice. Hybrids look more relevant to sounding rockets and small launchers.

What Limits Turkish Solid-Motor Output?

Three things stand out. First, the propellant itself: ingredients such as ammonium perchlorate and specialist binders are not trivial to source or make, and a reliable domestic chain matters as much as a new plant. Second, large motors need big casings, often in high-strength steel or composites, plus nozzle materials that survive extreme heat. Third, every batch has to be tested, and failures in a large grain are expensive.

ROKETSAN’s own profile leans on its claim to control rocket motors, warheads and composite structures in-house, and independent verification of the depth of that control is limited. What can be said from public sources is that the company is putting substantial money into propellant production and that the TAYFUN, air-defence and rocket programmes all rely on it. If the Kırıkkale plant performs as described, the answer to how Türkiye keeps increasing missile output will lie in casting halls and curing ovens as much as on launch pads.