That's quite possible. I know it's possible (don't know if it's legal) to make your own napalm. If you're into DIY projects, you could interchange your current barrel with one with a larger diameter (more surface area will give the propellant more 'umph'.)
~ @Ranger0203
I would want to keep the stream more narrow. The narrow stream is easier to maintain. If anything I would just add a stronger pressure system to pump out more propellant.
Napalm is already quite easy to make. Take some gas and find a way to solidify it to a more thick state.
However for legal reasons and my desire to not have Homeland Security knocking on my door, I will not use aluminum based thickeners. As that will make it into military grade napalm. I'll just stick with the classic Gasoline and Powdered Sugar mixture.
Or buy at least two or three more mini-drones from Target.
~ @Toostenheimer
I would use another thousand to have the burning of his drone put on a billboard in a downtown metropolitian area for a day.