Ukraine Unveils New Grim‑17 Pulse Jet Engine With High Thrust Capability

Ukrainian defense innovation continues to accelerate as engineers from the country’s Independent Design Bureau introduce the Grim‑17, a new compact pulsejet engine designed specifically for small unmanned aerial vehicles. Although still undergoing ground‑testing, the Grim‑17 has already drawn significant attention due to its lightweight construction, high thrust output, and potential adaptability for multiple battlefield roles. Early assessments suggest that the engine could eventually power low‑cost, short-range cruise missiles using two or more Grim‑17 units, or serve as a rapid‑response propulsion unit for anti‑drone defense systems, expanding its relevance far beyond its initial UAV application.

Grim‑17 Pulsejet Specifications and Compact Design

One of the most notable features of the Grim‑17 is its extremely compact form factor. Measuring just 940 mm in length with a diameter of 100 mm, the engine is engineered for platforms where space and weight are critical constraints. Weighing only 1.98 kg, the Grim‑17 offers an impressive thrust‑to‑weight ratio, making it suitable for lightweight drones that require high acceleration and sustained speed. This compactness also opens the door for multi‑engine configurations, allowing designers to pair two or more Grim‑17 units to achieve greater thrust for larger or faster unmanned systems.

Performance Capabilities and Thrust Output of the Grim‑17

Despite its small size, the Grim‑17 delivers a thrust output ranging from a minimum of 2.5 kg to a maximum of 7 kg. During standard operation, the engine is automatically limited to 90 percent of its peak capability, producing approximately 6.3 kg of thrust to ensure reliability and prevent overheating. This performance level positions the Grim‑17 as a viable propulsion option for reconnaissance drones, loitering munitions, and potentially even small cruise missiles designed for cost‑effective mass deployment.

Fuel Efficiency, Heat Levels, and Operational Endurance

The Grim‑17 operates on F100 gasoline, consuming around 6.3 liters per hour when running at 90 percent thrust. While pulsejets are not known for fuel efficiency, the Grim‑17’s consumption rate is considered acceptable for short‑duration missions. The engine’s body can withstand temperatures up to 800°C, a typical characteristic of pulsejet systems that rely on rapid combustion cycles. Noise levels exceed 140 dB, which is expected for this engine type and indicates that the Grim‑17 is optimized for expendable or unmanned platforms where acoustic signature is not a primary concern. Continuous operation is rated at up to 15 minutes, with a total service life of approximately 3 hours, aligning with the needs of short‑range tactical UAV missions.

Standard Equipment Package and Required Starting Components

The standard Grim‑17 package includes the main engine unit, a launch valve, an automatic fuel system, and a ground‑based ignition system. To initiate the engine, operators must supply an external air source, two 12‑volt batteries, and a remote start sensor. This setup reflects the typical requirements of pulsejet technology, which demands a controlled airflow and ignition sequence during startup.

Future Applications and Battlefield Potential of the Grim‑17

Although still in the testing phase, the Grim‑17 represents a promising step forward in Ukraine’s ongoing effort to expand its unmanned capabilities. Its low cost, simple construction, and high thrust output make it an attractive option for mass‑produced UAVs or disposable strike platforms. As development progresses, the Grim‑17 could become a key component in Ukraine’s evolving drone warfare strategy, offering flexibility for both offensive and defensive applications across the modern battlefield.