What is it about?
This work studies how a small drone can carry and aim a dry chemical fire extinguisher more accurately. When an extinguisher sprays, it pushes back on the drone, similar to recoil. At the same time, the drone becomes lighter as the extinguishing material is released. These changes can make the drone move away from the target or lose pointing accuracy. We developed a control method that helps the drone stay stable while also aiming the extinguisher nozzle at a desired point. The method separates the problem into two connected parts: one controller keeps the drone stable, and another controller adjusts the nozzle angle so the suppressant reaches the target. The controller adapts as the drone mass, reaction force, and nozzle angle change during operation. Simulation results show that this approach can greatly reduce position and targeting errors compared with more conventional control methods.
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Why is it important?
Firefighting drones could help respond to fires in places that are dangerous, difficult to reach, or too confined for larger equipment. However, using an onboard extinguisher creates a difficult control problem because the spray force can disturb the drone while the system mass is changing. This is especially important for small drones, where the extinguisher force can be large compared with the vehicle weight. The unique part of this work is that it treats fire suppression as a coupled flight-control and targeting problem. The drone must remain stable and aim the suppressant accurately at the same time. By accounting for reaction force, mass loss, and nozzle angle, this research provides a step toward more reliable autonomous firefighting drones.
Perspectives
This publication reflects my interest in control systems for safety-critical aerial robots operating under difficult physical conditions. Firefighting drones are often discussed as useful platforms, but accurate suppressant delivery is much more complex than simply carrying an extinguisher. The act of spraying changes the drone’s dynamics and can directly affect targeting accuracy. For me, the most important aspect of this work is showing that the controller must be designed around the physical interaction between the extinguisher and the drone. I see this as a foundation for future experimental work, including hardware testing, improved discharge modeling, and eventually practical aerial firefighting systems.
Shirin Dolatabadi
University of Toronto
Read the Original
This page is a summary of: Precision Control of a Firefighting Drone with Extinguisher for Flame Targeting, January 2026, American Institute of Aeronautics and Astronautics (AIAA),
DOI: 10.2514/6.2026-0332.
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