Ukraine debuts Hrim-17 pulsejet engine for next-gen lightweight drones

Ukrainian defence engineers have unveiled the Hrim-17, a new pulsejet engine built for lightweight drones. The system was presented at the Brave1 defence exhibition on December 3. Designed for flexibility, it aims to support a range of unmanned aerial vehicles (UAVs) in military and training roles.

The engine remains in prototype form but signals progress in Ukraine’s push for homegrown jet-powered drone technology. Developed by Nezalezhne Konstruktor'ske Byuro, the Hrim-17 measures 940 mm long with a 100 mm diameter and weighs 1,980 grams. During operation, its casing can reach temperatures of 800°C, while noise levels exceed 140 decibels. The system runs on F100-grade gasoline, consuming roughly 6.3 litres per hour at 90% thrust.

The engine delivers thrust between 2.5 kg and 7 kg, though operational use caps at 6.3 kg for better efficiency and durability. It draws 48 watts of power and can run continuously for 15 minutes, with a total lifespan of about three hours. The standard package includes the engine itself, a launch valve, an automated fuel system, and a ground-based ignition unit.

Adaptability is a key feature of the Hrim-17. It can be fitted to high-speed loitering munitions, reconnaissance drones, and training platforms. Engineers see it as a foundation for scaling up jet-powered UAV capabilities within Ukraine’s defence industry. The Hrim-17 prototype expands Ukraine’s options for jet-driven drones. Its modular design and fuel efficiency allow for multiple applications, from combat to training. Further testing and development will determine its role in future UAV systems.