So you would like to use your drone as a flamethrower? The TF-19 WASP has you covered. It is a flamethrower drone attachment with a 1-gallon fuel capacity and range of 25ft. It is designed for drone platforms with payload capacity of 5lbs or more, such as the DJI S1000.
The TF-19 WASP flamethrower drone can shoot a long stream of fire for 100 seconds. It lets you remotely ignite targets from miles away.